# \[ask\] how to use an array of double in Java Processing

**URL:** https://discourse.processing.org/t/ask-how-to-use-an-array-of-double-in-java-processing/2908
**Category:** Coding Questions
**Created:** [August 24, 2018, 3:03am UTC](https://discourse.processing.org/t/ask-how-to-use-an-array-of-double-in-java-processing/2908 "2018-08-24T03:03:32Z")
**Posts on this page:** 20
**Page:** 1

<div class="post-metadata">

### Author: ![tavisena](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/tavisena/32/1200_2.png) [@tavisena](https://discourse.processing.org/u/tavisena)
#### Post date: [August 24, 2018, 3:03am UTC](https://discourse.processing.org/t/ask-how-to-use-an-array-of-double-in-java-processing/2908/1 "2018-08-24T03:03:32Z")

</div>

hi everyone!

i have some project about using svm the coding using C++, ii wanna use this parameter in my java processing because i needed to control robot using leap motion and the svm as the decision maker. the array of double send error.

in the processing web they said

> Processing functions don’t use this datatype, so while they work in the language, you’ll usually have to convert to a float using the (float) syntax before passing into a function

please help! i really stuck

```auto
double param1[6][14] = {{1,1,1,1,0.792019601,1,1,-1,-1,-1,-1,-1,-0.792019601,-1},
						{-1,-1,-1,-1,-1,-1,-1,1,1,1,1,1,1,1},
						{-1,-1,-1,-1,-1,-1,-1,1,1,1,1,1,1,1},
						{-1,-1,-1,-1,-1,-1,-1,1,1,1,1,1,1,1},
						{0,0,0,0,0,0,0,0,0,0,0,0,0,0},
						{0.033558,0.033558,0.033558,0.033558,0.033558,0.033558,0.033558,0.033558,0.033558,0.033558,0.033558,0.033558,0.033558,0.033558}};
double param2[6][18] = {{1,1,1,1,0.318464496,1,1,1,0.769380154,-1,-1,-1,-1,-0.087844649,-1,-1,-1,-1},
						{-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1},
						{-0.25701,-0.21729,-0.09348,-0.08653,0.145652,0.062454,-0.01667,0.079085,0.0012,-0.4499,-0.44327,-0.46571,-0.42028,-0.42201,-0.44852,-0.41926,-0.39713,-0.40579},
						{-121085,-116608,-107282,-112798,-0.88837,-0.94401,-107663,-0.90106,-115809,-0.84784,-0.83931,-0.80587,-0.70346,-0.70533,-0.92365,-0.9593,-0.97531,-0.94895},
						{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
						{-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568}};
double param3[6][19] = {{1,1,1,1,0.456578608,1,1,1,1,-1,-0.187059758,-1,-1,-1,-1,-1,-1,-1,-0.26951885},
						{1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1},
						{-1.25614,-1.19248,-0.994,-0.98286,-0.66881,-0.87087,-0.65989,-0.84223,-0.7936,-1.22893,-1.19252,-1.29349,-0.98669,-0.98892,-1.18328,-1.36766,-1.32095,-0.24681,0.483479},
						{0.323382,0.354186,0.418358,0.380401,0.487666,0.415735,0.365585,0.359688,0.345772,0.074203,-0.00114,0.093422,0.007426,-0.04313,0.033755,0.055782,0.035636,-0.17976,-0.42344},
						{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
						{-0.02824,-0.02825,-0.02826,-0.02827,-0.02828,-0.02829,-0.02830,-0.02831,-0.02832,-0.02833,-0.02834,-0.02835,-0.02836,-0.02837,-0.02838,-0.02839,-0.02840,-0.02841,-0.02842}};
double param4[6][20] = {{1,1,1,1,1,1,0.463702921,1,1,1,-1,-1,-0.705748012,-1,-1,-1,-1,-1,-1,-0.75795491},
						{-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,1},
						{1.017038,1.046933,0.902235,0.736103,0.860032,0.736503,0.724111,0.655464,0.67848,0.713734,1.140196,1.150551,1.115492,1.14235,1.18807,1.222666,1.209121,0.924121,0.126399,-0.54345},
						{-0.37552,-0.41018,-0.42873,-0.4702,-0.46058,-0.45412,-0.49043,-0.37792,-0.39576,-0.40371,-0.06427,-0.05869,-0.03677,-0.11394,-0.1373,-0.14779,-0.13052,-0.01386,0.167516,0.318457},
						{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
						{-0.24815,-0.24816,-0.24817,-0.24818,-0.24819,-0.24820,-0.24821,-0.24822,-0.24823,-0.24824,-0.24825,-0.24826,-0.24827,-0.24828,-0.24829,-0.24830,-0.24831,-0.24832,-0.24833,-0.24834}};
double param5[6][16] = {{1,1,1,1,1,1,0.883359223,1,-1,-1,-1,-1,-0.883359223,-1,-1,-1},
						{-1,1,-1,1,-1,1,-1,1,-1,1,-1,1,-1,1,-1,1},
						{0.121326,0.140013,0.049562,-0.05429,-0.04718,0.02318,-0.09362,-0.06178,0.403332,0.425519,0.363987,0.382795,0.394049,0.43115,0.31879,0.34725},
						{1.162903,1.107373,1.07764,1.011192,0.96486,1.026602,0.969164,0.978771,0.900346,0.785385,0.929671,0.679563,0.646683,0.83863,0.872239,0.8415},
						{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
						{-0.98695,-0.98696,-0.98697,-0.98698,-0.98699,-0.98700,-0.98701,-0.98702,-0.98703,-0.98704,-0.98705,-0.98706,-0.98707,-0.98708,-0.98709,-0.98710}};
double param6[6][16] = {{1,1,1,0.339561015,1,1,1,1,-1,-1,-1,-1,-0.339561015,-1,-1,-1},
						{-1,1,-1,1,-1,1,-1,1,-1,1,-1,1,-1,1,-1,-1},
						{-0.20354,-0.19362,-0.2272,-0.15921,-0.20148,-0.15769,-0.12455,-0.13752,0.110591,0.144587,0.050308,0.079125,0.096368,0.153214,-0.01894,0.024663},
						{0.168873,0.173118,0.18977,0.240751,0.131133,0.113386,0.105415,0.118537,-0.19213,-0.24665,-0.17823,-0.29683,-0.31242,-0.2214,-0.20546,-0.22004},
						{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
						{0.03956,0.03957,0.03958,0.03959,0.03960,0.03961,0.03962,0.03963,0.03964,0.03965,0.03966,0.03967,0.03968,0.03969,0.03970,0.03971}};

void setX1(double x1[14]){
	for(int i=0; i<14; i++){
		param1[4][i] = x1[i]; 		
	}
}

void setX2(double x1[18]){
	for(int i=0; i<18; i++){
		param2[4][i] = x1[i]; 		
	}
}

void setX3(double x1[19]){
	for(int i=0; i<19; i++){
		param3[4][i] = x1[i]; 		
	}
}

void setX4(double x1[20]){
	for(int i=0; i<20; i++){
		param4[4][i] = x1[i]; 		
	}
}

void setX5(double x1[16]){
	for(int i=0; i<16; i++){
		param5[4][i] = x1[i]; 		
	}
}

void setX6(double x1[16]){
	for(int i=0; i<16; i++){
		param6[4][i] = x1[i]; 		
	}
}

int calculate(){
	int resultClass;
	int numInClass[] = {0,0,0,0} ;
	
	double sf1, sf2, sf3, sf4, sf5, sf6;
	
	for(int i=0; i<14; i++){
		sf1 += (param1[0][i] * param1[1][i] * (param1[2][i] + param1[3][i]) * param1[4][i]) + param1[5][i];
	}
	
	for(int i=0; i<18; i++){
		sf2 += (param2[0][i] * param2[1][i] * (param2[2][i] + param2[3][i]) * param2[4][i]) + param2[5][i];
	}
	
	for(int i=0; i<19; i++){
		sf3 += (param3[0][i] * param3[1][i] * (param3[2][i] + param3[3][i]) * param3[4][i]) + param3[5][i];
	}
	
	for(int i=0; i<20; i++){
		sf4 += (param4[0][i] * param4[1][i] * (param4[2][i] + param4[3][i]) * param4[4][i]) + param4[5][i];
	}
	
	for(int i=0; i<16; i++){
		sf5 += (param5[0][i] * param5[1][i] * (param5[2][i] + param5[3][i]) * param5[4][i]) + param5[5][i];
	}
	
	for(int i=0; i<16; i++){
		sf6 += (param6[0][i] * param6[1][i] * (param6[2][i] + param6[3][i]) * param6[4][i]) + param6[5][i];
	}
	
	if(sf1 > 0) numInClass[0]++;
	else numInClass[1]++;
	
	if(sf2 > 0) numInClass[0]++;
	else numInClass[2]++;
	
	if(sf3 > 0) numInClass[0]++;
	else numInClass[3]++;
	
	if(sf4 > 0) numInClass[1]++;
	else numInClass[2]++;
	
	if(sf5 > 0) numInClass[1]++;
	else numInClass[3]++;
	
	if(sf6 > 0) numInClass[2]++;
	else numInClass[3]++;
	
	cout<<"Class 1 : "<<numInClass[0]<<"\n";
	cout<<"Class 2 : "<<numInClass[1]<<"\n";
	cout<<"Class 3 : "<<numInClass[2]<<"\n";
	cout<<"Class 4 : "<<numInClass[3]<<"\n";
	
	int max = 0;
	for(int i=0; i<4; i++){
		if(numInClass[i] > max){
			max = numInClass[i];
			resultClass = i+1;
		}
	}
	
	
	cout<<"\nMax: "<<max;

	return resultClass;
} 

int main(){
	cout<<"\nResult: "<<calculate();
	return 0;	
}

```

---

<div class="post-metadata">

### Author: ![GoToLoop](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/gotoloop/32/86_2.png) [@GoToLoop](https://discourse.processing.org/u/GoToLoop)
#### Post date: [August 24, 2018, 3:50am UTC](https://discourse.processing.org/t/ask-how-to-use-an-array-of-double-in-java-processing/2908/2 "2018-08-24T03:50:38Z")

</div>

In Java, when we declare a variable as of datatype array, we don’t specify its dimension there.  
We merely use empty `[]` square brackets. ☕

So instead of C’s `double param1[6][14] = {{`.  
In Java we remove those dimension values at the left side of the assignment: `double param1[][] = {{`.  
Or even better, place the square brackets right after its datatype: `double[][] param1 = {{`.

```auto
final double[][] param1 = {
  {1, 1, 1, 1, 0.792019601, 1, 1, -1, -1, -1, -1, -1, -0.792019601, -1}, 
  {-1, -1, -1, -1, -1, -1, -1, 1, 1, 1, 1, 1, 1, 1}, 
  {-1, -1, -1, -1, -1, -1, -1, 1, 1, 1, 1, 1, 1, 1}, 
  {-1, -1, -1, -1, -1, -1, -1, 1, 1, 1, 1, 1, 1, 1}, 
  {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 
  {0.033558, 0.033558, 0.033558, 0.033558, 0.033558, 0.033558, 0.033558, 0.033558, 0.033558, 0.033558, 0.033558, 0.033558, 0.033558, 0.033558}
};

```

1. [Processing.org/reference/Array.html](http://Processing.org/reference/Array.html)
2. [Docs.Oracle.com/javase/tutorial/java/nutsandbolts/arrays.html](http://Docs.Oracle.com/javase/tutorial/java/nutsandbolts/arrays.html)

---

<div class="post-metadata">

### Author: ![kfrajer](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/kfrajer/32/196_2.png) [@kfrajer](https://discourse.processing.org/u/kfrajer)
#### Post date: [August 24, 2018, 3:56am UTC](https://discourse.processing.org/t/ask-how-to-use-an-array-of-double-in-java-processing/2908/3 "2018-08-24T03:56:52Z")

</div>

The code that you provided is in C++. You need to migrate it to Java. For instance, remove the main function. Is not needed as Processing provides one for you under the hood. Also you need to replace;

`cout<<"Class 1 : "<<numInClass[0]<<"\n";`

for

`println("Class 1 : ",numInClass[0],"\n");`

You might need to fix some other lines.

Kf

---

<div class="post-metadata">

### Author: ![GoToLoop](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/gotoloop/32/86_2.png) [@GoToLoop](https://discourse.processing.org/u/GoToLoop)
#### Post date: [August 24, 2018, 4:04am UTC](https://discourse.processing.org/t/ask-how-to-use-an-array-of-double-in-java-processing/2908/4 "2018-08-24T04:04:46Z")

</div>

@kfrajer, a more precise conversion of `cout<<"Class 1 : "<<numInClass[0]<<"\n";`  
to Processing’s Java Mode would be: `println("Class 1 :", numInClass[0]);`  
Actually, **printArray()** would be much more succinct: `printArray(numInClass);` 😛

[Processing.org/reference/printArray\_.html](http://Processing.org/reference/printArray_.html)

---

<div class="post-metadata">

### Author: ![kfrajer](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/kfrajer/32/196_2.png) [@kfrajer](https://discourse.processing.org/u/kfrajer)
#### Post date: [August 24, 2018, 4:25am UTC](https://discourse.processing.org/t/ask-how-to-use-an-array-of-double-in-java-processing/2908/5 "2018-08-24T04:25:14Z")

</div>

Yes, @GoToLoop, you are right. However, I believe it is better to keep the conversion as simple as possible, specially for somebody coming from C++. However, my conversion sort of fail as I used `println` together with the new line char ‘`\n`’. I’d rather wait for the OP to provide an update on his migration before providing any other feedback.

Kf

---

<div class="post-metadata">

### Author: ![GoToLoop](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/gotoloop/32/86_2.png) [@GoToLoop](https://discourse.processing.org/u/GoToLoop)
#### Post date: [August 24, 2018, 9:05am UTC](https://discourse.processing.org/t/ask-how-to-use-an-array-of-double-in-java-processing/2908/6 "2018-08-24T09:05:00Z")

</div>

> [@kfrajer](#):
>
> I’d rather wait for the OP to provide an update on his migration before providing any other feedback.

You’re right. However, I’ve noticed there are 6 2D arrays, named from _param1_ to _param6_. 🤓

They can all easily become 1 unified 3D array instead: 😳

```java
final double[][][] params = { // [6]x[6]x[]
  { // param1[14]
    { 1, 1, 1, 1, 0.792019601, 1, 1, -1, -1, -1, -1, -1, -0.792019601, -1 }, 
    { -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, 1, 1, 1, 1 }, 
    { -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, 1, 1, 1, 1 }, 
    { -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, 1, 1, 1, 1 }, 
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 
    { 0.033558, 0.033558, 0.033558, 0.033558, 0.033558, 0.033558, 0.033558, 0.033558, 0.033558, 0.033558, 0.033558, 0.033558, 0.033558, 0.033558 }
  }, 

  { // param2[18]
    { 1, 1, 1, 1, 0.318464496, 1, 1, 1, 0.769380154, -1, -1, -1, -1, -0.087844649, -1, -1, -1, -1 }, 
    { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, 
    { -0.25701, -0.21729, -0.09348, -0.08653, 0.145652, 0.062454, -0.01667, 0.079085, 0.0012, -0.4499, -0.44327, -0.46571, -0.42028, -0.42201, -0.44852, -0.41926, -0.39713, -0.40579 }, 
    { -121085, -116608, -107282, -112798, -0.88837, -0.94401, -107663, -0.90106, -115809, -0.84784, -0.83931, -0.80587, -0.70346, -0.70533, -0.92365, -0.9593, -0.97531, -0.94895 }, 
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 
    { -0.86568, -0.86568, -0.86568, -0.86568, -0.86568, -0.86568, -0.86568, -0.86568, -0.86568, -0.86568, -0.86568, -0.86568, -0.86568, -0.86568, -0.86568, -0.86568, -0.86568, -0.86568 }
  }, 

  { // param3[19]
    { 1, 1, 1, 1, 0.456578608, 1, 1, 1, 1, -1, -0.187059758, -1, -1, -1, -1, -1, -1, -1, -0.26951885 }, 
    { 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 }, 
    { -1.25614, -1.19248, -0.994, -0.98286, -0.66881, -0.87087, -0.65989, -0.84223, -0.7936, -1.22893, -1.19252, -1.29349, -0.98669, -0.98892, -1.18328, -1.36766, -1.32095, -0.24681, 0.483479 }, 
    { 0.323382, 0.354186, 0.418358, 0.380401, 0.487666, 0.415735, 0.365585, 0.359688, 0.345772, 0.074203, -0.00114, 0.093422, 0.007426, -0.04313, 0.033755, 0.055782, 0.035636, -0.17976, -0.42344 }, 
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 
    { -0.02824, -0.02825, -0.02826, -0.02827, -0.02828, -0.02829, -0.02830, -0.02831, -0.02832, -0.02833, -0.02834, -0.02835, -0.02836, -0.02837, -0.02838, -0.02839, -0.02840, -0.02841, -0.02842 }
  }, 

  { // param4[20]
    { 1, 1, 1, 1, 1, 1, 0.463702921, 1, 1, 1, -1, -1, -0.705748012, -1, -1, -1, -1, -1, -1, -0.75795491 }, 
    { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1 }, 
    { 1.017038, 1.046933, 0.902235, 0.736103, 0.860032, 0.736503, 0.724111, 0.655464, 0.67848, 0.713734, 1.140196, 1.150551, 1.115492, 1.14235, 1.18807, 1.222666, 1.209121, 0.924121, 0.126399, -0.54345 }, 
    { -0.37552, -0.41018, -0.42873, -0.4702, -0.46058, -0.45412, -0.49043, -0.37792, -0.39576, -0.40371, -0.06427, -0.05869, -0.03677, -0.11394, -0.1373, -0.14779, -0.13052, -0.01386, 0.167516, 0.318457 }, 
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 
    { -0.24815, -0.24816, -0.24817, -0.24818, -0.24819, -0.24820, -0.24821, -0.24822, -0.24823, -0.24824, -0.24825, -0.24826, -0.24827, -0.24828, -0.24829, -0.24830, -0.24831, -0.24832, -0.24833, -0.24834 }
  }, 

  { // param5[16]
    { 1, 1, 1, 1, 1, 1, 0.883359223, 1, -1, -1, -1, -1, -0.883359223, -1, -1, -1 }, 
    { -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1 }, 
    { 0.121326, 0.140013, 0.049562, -0.05429, -0.04718, 0.02318, -0.09362, -0.06178, 0.403332, 0.425519, 0.363987, 0.382795, 0.394049, 0.43115, 0.31879, 0.34725 }, 
    { 1.162903, 1.107373, 1.07764, 1.011192, 0.96486, 1.026602, 0.969164, 0.978771, 0.900346, 0.785385, 0.929671, 0.679563, 0.646683, 0.83863, 0.872239, 0.8415 }, 
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 
    { -0.98695, -0.98696, -0.98697, -0.98698, -0.98699, -0.98700, -0.98701, -0.98702, -0.98703, -0.98704, -0.98705, -0.98706, -0.98707, -0.98708, -0.98709, -0.98710 }
  }, 

  { // param6[16]
    { 1, 1, 1, 0.339561015, 1, 1, 1, 1, -1, -1, -1, -1, -0.339561015, -1, -1, -1 }, 
    { -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, -1 }, 
    { -0.20354, -0.19362, -0.2272, -0.15921, -0.20148, -0.15769, -0.12455, -0.13752, 0.110591, 0.144587, 0.050308, 0.079125, 0.096368, 0.153214, -0.01894, 0.024663 }, 
    { 0.168873, 0.173118, 0.18977, 0.240751, 0.131133, 0.113386, 0.105415, 0.118537, -0.19213, -0.24665, -0.17823, -0.29683, -0.31242, -0.2214, -0.20546, -0.22004 }, 
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 
    { 0.03956, 0.03957, 0.03958, 0.03959, 0.03960, 0.03961, 0.03962, 0.03963, 0.03964, 0.03965, 0.03966, 0.03967, 0.03968, 0.03969, 0.03970, 0.03971 }
  }
};

```

This way, this statement: `sf1 += (param1[0][i] * param1[1][i] * (param1[2][i] + param1[3][i]) * param1[4][i]) + param1[5][i];`

Becomes: `sf1 += (params[0][0][i] * params[0][1][i] * (params[0][2][i] + params[0][3][i]) * params[0][4][i]) + params[0][5][i];`

---

<div class="post-metadata">

### Author: ![tavisena](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/tavisena/32/1200_2.png) [@tavisena](https://discourse.processing.org/u/tavisena)
#### Post date: [August 24, 2018, 9:11am UTC](https://discourse.processing.org/t/ask-how-to-use-an-array-of-double-in-java-processing/2908/7 "2018-08-24T09:11:45Z")

</div>

thank you @GoToLoop and @kfrajer sorry about the code, i’m really new in java programming btw i already tried your code and it works, but still got error in the resultClass am i need it in an array or something

```auto
int max = 0;
  for(int i=0; i<4; i++){
    if(numInClass[i] > max){
      max = numInClass[i];
      resultClass = [i] + 1;
    }
  }
  
  println ("\nMax: ",max);

  return resultClass;
} 

```

---

<div class="post-metadata">

### Author: ![neilcsmith](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/neilcsmith/32/144_2.png) [@neilcsmith](https://discourse.processing.org/u/neilcsmith)
#### Post date: [August 24, 2018, 9:18am UTC](https://discourse.processing.org/t/ask-how-to-use-an-array-of-double-in-java-processing/2908/8 "2018-08-24T09:18:52Z")

</div>

> [@tavisena](#):
>
> resultClass = [i] + 1;

What is that line meant to be?! Looks like a syntax error in C and Java. Maybe just `i + 1`?

---

<div class="post-metadata">

### Author: ![tavisena](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/tavisena/32/1200_2.png) [@tavisena](https://discourse.processing.org/u/tavisena)
#### Post date: [August 24, 2018, 9:33am UTC](https://discourse.processing.org/t/ask-how-to-use-an-array-of-double-in-java-processing/2908/9 "2018-08-24T09:33:06Z")

</div>

its the target class that i wanna get

if i chage it to `i+1` the resultClass not initialized.

and if the resultClass in an array like `int [] resultClass`  
the resultClass just doesn’t match with int[]

---

<div class="post-metadata">

### Author: ![neilcsmith](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/neilcsmith/32/144_2.png) [@neilcsmith](https://discourse.processing.org/u/neilcsmith)
#### Post date: [August 24, 2018, 9:56am UTC](https://discourse.processing.org/t/ask-how-to-use-an-array-of-double-in-java-processing/2908/10 "2018-08-24T09:56:48Z")

</div>

> [@tavisena](#):
>
> the resultClass just doesn’t match with int

In the original code you posted it’s an `int`.

---

<div class="post-metadata">

### Author: ![tavisena](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/tavisena/32/1200_2.png) [@tavisena](https://discourse.processing.org/u/tavisena)
#### Post date: [August 24, 2018, 10:01am UTC](https://discourse.processing.org/t/ask-how-to-use-an-array-of-double-in-java-processing/2908/11 "2018-08-24T10:01:40Z")

</div>

this is my program, but the sf1 trough sf6 still got an error does noot initialize, am i still lose something?

thank you

```auto
final double[][] param1 ={
            {1,1,1,1,0.792019601,1,1,-1,-1,-1,-1,-1,-0.792019601,-1},
            {-1,-1,-1,-1,-1,-1,-1,1,1,1,1,1,1,1},
            {-1,-1,-1,-1,-1,-1,-1,1,1,1,1,1,1,1},
            {-1,-1,-1,-1,-1,-1,-1,1,1,1,1,1,1,1},
            {0,0,0,0,0,0,0,0,0,0,0,0,0,0},
            {0.033558,0.033558,0.033558,0.033558,0.033558,0.033558,0.033558,0.033558,0.033558,0.033558,0.033558,0.033558,0.033558,0.033558}
          };
final double[][] param2 ={
            {1,1,1,1,0.318464496,1,1,1,0.769380154,-1,-1,-1,-1,-0.087844649,-1,-1,-1,-1},
            {-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1},
            {-0.25701,-0.21729,-0.09348,-0.08653,0.145652,0.062454,-0.01667,0.079085,0.0012,-0.4499,-0.44327,-0.46571,-0.42028,-0.42201,-0.44852,-0.41926,-0.39713,-0.40579},
            {-121085,-116608,-107282,-112798,-0.88837,-0.94401,-107663,-0.90106,-115809,-0.84784,-0.83931,-0.80587,-0.70346,-0.70533,-0.92365,-0.9593,-0.97531,-0.94895},
            {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
            {-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568}
          };
final double[][] param3 ={
            {1,1,1,1,0.456578608,1,1,1,1,-1,-0.187059758,-1,-1,-1,-1,-1,-1,-1,-0.26951885},
            {1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1},
            {-1.25614,-1.19248,-0.994,-0.98286,-0.66881,-0.87087,-0.65989,-0.84223,-0.7936,-1.22893,-1.19252,-1.29349,-0.98669,-0.98892,-1.18328,-1.36766,-1.32095,-0.24681,0.483479},
            {0.323382,0.354186,0.418358,0.380401,0.487666,0.415735,0.365585,0.359688,0.345772,0.074203,-0.00114,0.093422,0.007426,-0.04313,0.033755,0.055782,0.035636,-0.17976,-0.42344},
            {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
            {-0.02824,-0.02825,-0.02826,-0.02827,-0.02828,-0.02829,-0.02830,-0.02831,-0.02832,-0.02833,-0.02834,-0.02835,-0.02836,-0.02837,-0.02838,-0.02839,-0.02840,-0.02841,-0.02842}
          };
final double[][] param4 ={
            {1,1,1,1,1,1,0.463702921,1,1,1,-1,-1,-0.705748012,-1,-1,-1,-1,-1,-1,-0.75795491},
            {-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,1},
            {1.017038,1.046933,0.902235,0.736103,0.860032,0.736503,0.724111,0.655464,0.67848,0.713734,1.140196,1.150551,1.115492,1.14235,1.18807,1.222666,1.209121,0.924121,0.126399,-0.54345},
            {-0.37552,-0.41018,-0.42873,-0.4702,-0.46058,-0.45412,-0.49043,-0.37792,-0.39576,-0.40371,-0.06427,-0.05869,-0.03677,-0.11394,-0.1373,-0.14779,-0.13052,-0.01386,0.167516,0.318457},
            {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
            {-0.24815,-0.24816,-0.24817,-0.24818,-0.24819,-0.24820,-0.24821,-0.24822,-0.24823,-0.24824,-0.24825,-0.24826,-0.24827,-0.24828,-0.24829,-0.24830,-0.24831,-0.24832,-0.24833,-0.24834}
          };
final double[][] param5 ={
            {1,1,1,1,1,1,0.883359223,1,-1,-1,-1,-1,-0.883359223,-1,-1,-1},
            {-1,1,-1,1,-1,1,-1,1,-1,1,-1,1,-1,1,-1,1},
            {0.121326,0.140013,0.049562,-0.05429,-0.04718,0.02318,-0.09362,-0.06178,0.403332,0.425519,0.363987,0.382795,0.394049,0.43115,0.31879,0.34725},
            {1.162903,1.107373,1.07764,1.011192,0.96486,1.026602,0.969164,0.978771,0.900346,0.785385,0.929671,0.679563,0.646683,0.83863,0.872239,0.8415},
            {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
            {-0.98695,-0.98696,-0.98697,-0.98698,-0.98699,-0.98700,-0.98701,-0.98702,-0.98703,-0.98704,-0.98705,-0.98706,-0.98707,-0.98708,-0.98709,-0.98710}
          };
final double[][] param6 ={
            {1,1,1,0.339561015,1,1,1,1,-1,-1,-1,-1,-0.339561015,-1,-1,-1},
            {-1,1,-1,1,-1,1,-1,1,-1,1,-1,1,-1,1,-1,-1},
            {-0.20354,-0.19362,-0.2272,-0.15921,-0.20148,-0.15769,-0.12455,-0.13752,0.110591,0.144587,0.050308,0.079125,0.096368,0.153214,-0.01894,0.024663},
            {0.168873,0.173118,0.18977,0.240751,0.131133,0.113386,0.105415,0.118537,-0.19213,-0.24665,-0.17823,-0.29683,-0.31242,-0.2214,-0.20546,-0.22004},
            {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
            {0.03956,0.03957,0.03958,0.03959,0.03960,0.03961,0.03962,0.03963,0.03964,0.03965,0.03966,0.03967,0.03968,0.03969,0.03970,0.03971}
          };

void setX1(double [] x1){
  for(int i=0; i<14; i++){
    param1[4][i] = x1[i];     
  }
}

void setX2(double [] x1){
  for(int i=0; i<18; i++){
    param2[4][i] = x1[i];     
  }
}

void setX3(double [] x1){
  for(int i=0; i<19; i++){
    param3[4][i] = x1[i];     
  }
}

void setX4(double [] x1){
  for(int i=0; i<20; i++){
    param4[4][i] = x1[i];     
  }
}

void setX5(double [] x1){
  for(int i=0; i<16; i++){
    param5[4][i] = x1[i];     
  }
}

void setX6(double [] x1){
  for(int i=0; i<16; i++){
    param6[4][i] = x1[i];     
  }
}

int calculate(){
  int resultClass;
  int [] numInClass = {0,0,0,0} ;
  
  double sf1, sf2, sf3, sf4, sf5, sf6;
  
  for(int i=0; i<14; i++){
    ;
  }
  
  for(int i=0; i<18; i++){
    sf2 += (param2[0][i] * param2[1][i] * (param2[2][i] + param2[3][i]) * param2[4][i]) + param2[5][i];
  }
  
  for(int i=0; i<19; i++){
    sf3 += (param3[0][i] * param3[1][i] * (param3[2][i] + param3[3][i]) * param3[4][i]) + param3[5][i];
  }
  
  for(int i=0; i<20; i++){
    sf4 += (param4[0][i] * param4[1][i] * (param4[2][i] + param4[3][i]) * param4[4][i]) + param4[5][i];
  }
  
  for(int i=0; i<16; i++){
    sf5 += (param5[0][i] * param5[1][i] * (param5[2][i] + param5[3][i]) * param5[4][i]) + param5[5][i];
  }
  
  for(int i=0; i<16; i++){
    sf6 += (param6[0][i] * param6[1][i] * (param6[2][i] + param6[3][i]) * param6[4][i]) + param6[5][i];
  }
  
  if(sf1 > 0) numInClass[0]++;
  else numInClass[1]++;
  
  if(sf2 > 0) numInClass[0]++;
  else numInClass[2]++;
  
  if(sf3 > 0) numInClass[0]++;
  else numInClass[3]++;
  
  if(sf4 > 0) numInClass[1]++;
  else numInClass[2]++;
  
  if(sf5 > 0) numInClass[1]++;
  else numInClass[3]++;
  
  if(sf6 > 0) numInClass[2]++;
  else numInClass[3]++;
  
  printArray(numInClass);
  
  int max = 0;
  for(int i=0; i<4; i++){
    if(numInClass[i] > max){
      max = numInClass[i];
      resultClass = i + 1;
    }
  }
  
  println ("\nMax: ",max);

  return resultClass;
} 

int main(){
  println("\nResult: ", calculate());
  return 0;  
}

```

---

<div class="post-metadata">

### Author: ![tavisena](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/tavisena/32/1200_2.png) [@tavisena](https://discourse.processing.org/u/tavisena)
#### Post date: [August 24, 2018, 10:18am UTC](https://discourse.processing.org/t/ask-how-to-use-an-array-of-double-in-java-processing/2908/12 "2018-08-24T10:18:43Z")

</div>

yes i use an **int** , the int [] just example if i change the code

---

<div class="post-metadata">

### Author: ![neilcsmith](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/neilcsmith/32/144_2.png) [@neilcsmith](https://discourse.processing.org/u/neilcsmith)
#### Post date: [August 24, 2018, 10:21am UTC](https://discourse.processing.org/t/ask-how-to-use-an-array-of-double-in-java-processing/2908/13 "2018-08-24T10:21:39Z")

</div>

I got it to compile and run making 3 changes. Whether it does what you want is another matter! 😄

Local variables _must_ be initialised with a value before being accessed. So,

```auto
int resultClass; 

```

should be

```auto
int resultClass = 0;

```

and

```auto
double sf1, sf2, sf3, sf4, sf5, sf6;

```

should be

```auto
double sf1 = 0, sf2 = 0, sf3 = 0, sf4 = 0, sf5 = 0, sf6 = 0;

```

And you need to replace `main` with `setup()` for Processing purposes. It doesn’t return anything.

```auto
void setup(){
  println("\nResult: ", calculate());
}

```

---

<div class="post-metadata">

### Author: ![tavisena](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/tavisena/32/1200_2.png) [@tavisena](https://discourse.processing.org/u/tavisena)
#### Post date: [August 24, 2018, 10:30am UTC](https://discourse.processing.org/t/ask-how-to-use-an-array-of-double-in-java-processing/2908/14 "2018-08-24T10:30:37Z")

</div>

thank you @neilcsmith you’re rock. its okay for now…i’ll try with my main code

---

<div class="post-metadata">

### Author: ![tavisena](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/tavisena/32/1200_2.png) [@tavisena](https://discourse.processing.org/u/tavisena)
#### Post date: [August 24, 2018, 10:31am UTC](https://discourse.processing.org/t/ask-how-to-use-an-array-of-double-in-java-processing/2908/15 "2018-08-24T10:31:44Z")

</div>

```auto
//fix code
final double[][] param1 ={
            {1,1,1,1,0.792019601,1,1,-1,-1,-1,-1,-1,-0.792019601,-1},
            {-1,-1,-1,-1,-1,-1,-1,1,1,1,1,1,1,1},
            {-1,-1,-1,-1,-1,-1,-1,1,1,1,1,1,1,1},
            {-1,-1,-1,-1,-1,-1,-1,1,1,1,1,1,1,1},
            {0,0,0,0,0,0,0,0,0,0,0,0,0,0},
            {0.033558,0.033558,0.033558,0.033558,0.033558,0.033558,0.033558,0.033558,0.033558,0.033558,0.033558,0.033558,0.033558,0.033558}
          };
final double[][] param2 ={
            {1,1,1,1,0.318464496,1,1,1,0.769380154,-1,-1,-1,-1,-0.087844649,-1,-1,-1,-1},
            {-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1},
            {-0.25701,-0.21729,-0.09348,-0.08653,0.145652,0.062454,-0.01667,0.079085,0.0012,-0.4499,-0.44327,-0.46571,-0.42028,-0.42201,-0.44852,-0.41926,-0.39713,-0.40579},
            {-121085,-116608,-107282,-112798,-0.88837,-0.94401,-107663,-0.90106,-115809,-0.84784,-0.83931,-0.80587,-0.70346,-0.70533,-0.92365,-0.9593,-0.97531,-0.94895},
            {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
            {-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568,-0.86568}
          };
final double[][] param3 ={
            {1,1,1,1,0.456578608,1,1,1,1,-1,-0.187059758,-1,-1,-1,-1,-1,-1,-1,-0.26951885},
            {1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1},
            {-1.25614,-1.19248,-0.994,-0.98286,-0.66881,-0.87087,-0.65989,-0.84223,-0.7936,-1.22893,-1.19252,-1.29349,-0.98669,-0.98892,-1.18328,-1.36766,-1.32095,-0.24681,0.483479},
            {0.323382,0.354186,0.418358,0.380401,0.487666,0.415735,0.365585,0.359688,0.345772,0.074203,-0.00114,0.093422,0.007426,-0.04313,0.033755,0.055782,0.035636,-0.17976,-0.42344},
            {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
            {-0.02824,-0.02825,-0.02826,-0.02827,-0.02828,-0.02829,-0.02830,-0.02831,-0.02832,-0.02833,-0.02834,-0.02835,-0.02836,-0.02837,-0.02838,-0.02839,-0.02840,-0.02841,-0.02842}
          };
final double[][] param4 ={
            {1,1,1,1,1,1,0.463702921,1,1,1,-1,-1,-0.705748012,-1,-1,-1,-1,-1,-1,-0.75795491},
            {-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,1},
            {1.017038,1.046933,0.902235,0.736103,0.860032,0.736503,0.724111,0.655464,0.67848,0.713734,1.140196,1.150551,1.115492,1.14235,1.18807,1.222666,1.209121,0.924121,0.126399,-0.54345},
            {-0.37552,-0.41018,-0.42873,-0.4702,-0.46058,-0.45412,-0.49043,-0.37792,-0.39576,-0.40371,-0.06427,-0.05869,-0.03677,-0.11394,-0.1373,-0.14779,-0.13052,-0.01386,0.167516,0.318457},
            {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
            {-0.24815,-0.24816,-0.24817,-0.24818,-0.24819,-0.24820,-0.24821,-0.24822,-0.24823,-0.24824,-0.24825,-0.24826,-0.24827,-0.24828,-0.24829,-0.24830,-0.24831,-0.24832,-0.24833,-0.24834}
          };
final double[][] param5 ={
            {1,1,1,1,1,1,0.883359223,1,-1,-1,-1,-1,-0.883359223,-1,-1,-1},
            {-1,1,-1,1,-1,1,-1,1,-1,1,-1,1,-1,1,-1,1},
            {0.121326,0.140013,0.049562,-0.05429,-0.04718,0.02318,-0.09362,-0.06178,0.403332,0.425519,0.363987,0.382795,0.394049,0.43115,0.31879,0.34725},
            {1.162903,1.107373,1.07764,1.011192,0.96486,1.026602,0.969164,0.978771,0.900346,0.785385,0.929671,0.679563,0.646683,0.83863,0.872239,0.8415},
            {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
            {-0.98695,-0.98696,-0.98697,-0.98698,-0.98699,-0.98700,-0.98701,-0.98702,-0.98703,-0.98704,-0.98705,-0.98706,-0.98707,-0.98708,-0.98709,-0.98710}
          };
final double[][] param6 ={
            {1,1,1,0.339561015,1,1,1,1,-1,-1,-1,-1,-0.339561015,-1,-1,-1},
            {-1,1,-1,1,-1,1,-1,1,-1,1,-1,1,-1,1,-1,-1},
            {-0.20354,-0.19362,-0.2272,-0.15921,-0.20148,-0.15769,-0.12455,-0.13752,0.110591,0.144587,0.050308,0.079125,0.096368,0.153214,-0.01894,0.024663},
            {0.168873,0.173118,0.18977,0.240751,0.131133,0.113386,0.105415,0.118537,-0.19213,-0.24665,-0.17823,-0.29683,-0.31242,-0.2214,-0.20546,-0.22004},
            {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
            {0.03956,0.03957,0.03958,0.03959,0.03960,0.03961,0.03962,0.03963,0.03964,0.03965,0.03966,0.03967,0.03968,0.03969,0.03970,0.03971}
          };

void setX1(double [] x1){
  for(int i=0; i<14; i++){
    param1[4][i] = x1[i];     
  }
}

void setX2(double [] x1){
  for(int i=0; i<18; i++){
    param2[4][i] = x1[i];     
  }
}

void setX3(double [] x1){
  for(int i=0; i<19; i++){
    param3[4][i] = x1[i];     
  }
}

void setX4(double [] x1){
  for(int i=0; i<20; i++){
    param4[4][i] = x1[i];     
  }
}

void setX5(double [] x1){
  for(int i=0; i<16; i++){
    param5[4][i] = x1[i];     
  }
}

void setX6(double [] x1){
  for(int i=0; i<16; i++){
    param6[4][i] = x1[i];     
  }
}

int calculate(){
  int resultClass = 0;
  int [] numInClass = {0,0,0,0} ;
  
  double sf1 = 0, sf2 = 0, sf3 = 0, sf4 = 0, sf5 = 0, sf6 = 0;
  
  for(int i=0; i<14; i++){
    sf1 += (param1[0][i] * param1[1][i] * (param1[2][i] + param1[3][i]) * param1[4][i]) + param1[5][i];
  }
  
  for(int i=0; i<18; i++){
    sf2 += (param2[0][i] * param2[1][i] * (param2[2][i] + param2[3][i]) * param2[4][i]) + param2[5][i];
  }
  
  for(int i=0; i<19; i++){
    sf3 += (param3[0][i] * param3[1][i] * (param3[2][i] + param3[3][i]) * param3[4][i]) + param3[5][i];
  }
  
  for(int i=0; i<20; i++){
    sf4 += (param4[0][i] * param4[1][i] * (param4[2][i] + param4[3][i]) * param4[4][i]) + param4[5][i];
  }
  
  for(int i=0; i<16; i++){
    sf5 += (param5[0][i] * param5[1][i] * (param5[2][i] + param5[3][i]) * param5[4][i]) + param5[5][i];
  }
  
  for(int i=0; i<16; i++){
    sf6 += (param6[0][i] * param6[1][i] * (param6[2][i] + param6[3][i]) * param6[4][i]) + param6[5][i];
  }
  
  if(sf1 > 0) numInClass[0]++;
  else numInClass[1]++;
  
  if(sf2 > 0) numInClass[0]++;
  else numInClass[2]++;
  
  if(sf3 > 0) numInClass[0]++;
  else numInClass[3]++;
  
  if(sf4 > 0) numInClass[1]++;
  else numInClass[2]++;
  
  if(sf5 > 0) numInClass[1]++;
  else numInClass[3]++;
  
  if(sf6 > 0) numInClass[2]++;
  else numInClass[3]++;
  
  printArray(numInClass);
  
  int max = 0;
  for(int i=0; i<4; i++){
    if(numInClass[i] > max){
      max = numInClass[i];
      resultClass = i + 1;
    }
  }
  
  println ("\nMax: ",max);

  return resultClass;
} 

void setup(){
  println("\nResult: ", calculate());
}

```

---

<div class="post-metadata">

### Author: ![GoToLoop](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/gotoloop/32/86_2.png) [@GoToLoop](https://discourse.processing.org/u/GoToLoop)
#### Post date: [August 24, 2018, 11:32am UTC](https://discourse.processing.org/t/ask-how-to-use-an-array-of-double-in-java-processing/2908/16 "2018-08-24T11:32:33Z")

</div>

> [@neilcsmith](#):
>
> Local variables _must_ be initialised with a value.

Pedantic: Local variables can’t be accessed before being initialized w/ some value. 🧐

We can postpone their initialization. And even let them completely unused! 😮

Again, avoid absolute verbs like **must** , **have to** , **gotta** , etc. 😳

---

<div class="post-metadata">

### Author: ![neilcsmith](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/neilcsmith/32/144_2.png) [@neilcsmith](https://discourse.processing.org/u/neilcsmith)
#### Post date: [August 24, 2018, 11:40am UTC](https://discourse.processing.org/t/ask-how-to-use-an-array-of-double-in-java-processing/2908/17 "2018-08-24T11:40:58Z")

</div>

> [@GoToLoop](#):
>
> Again, avoid absolute verbs like **must** , **have to** , **gotta** , etc. 😳

No! You’re right, being pedantic, that local variables must be initialized _before being accessed_ (so yes, that can be delayed as long as the compiler can prove that a variable has been initialized before access). Doesn’t apply in this case.

I’m not stopping the use of absolute verbs with regards to language / compiler rules, etc. because that would be patently absurd!

---

<div class="post-metadata">

### Author: ![GoToLoop](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/gotoloop/32/86_2.png) [@GoToLoop](https://discourse.processing.org/u/GoToLoop)
#### Post date: [August 24, 2018, 11:43am UTC](https://discourse.processing.org/t/ask-how-to-use-an-array-of-double-in-java-processing/2908/18 "2018-08-24T11:43:49Z")

</div>

> [@neilcsmith](#):
>
> I’m not stopping the use of absolute verbs

I didn’t mean for n1 to stop using those verbs, but merely avoiding them when not absolutely sure! 🙃

Verbs like **should** or **need to** are more ambiguous. 😄

---

<div class="post-metadata">

### Author: ![neilcsmith](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/neilcsmith/32/144_2.png) [@neilcsmith](https://discourse.processing.org/u/neilcsmith)
#### Post date: [August 24, 2018, 11:47am UTC](https://discourse.processing.org/t/ask-how-to-use-an-array-of-double-in-java-processing/2908/19 "2018-08-24T11:47:03Z")

</div>

I _was_ absolutely sure! I don’t see the point in going into every little detail of the language spec when someone is new to the language, or being needlessly ambiguous in this case. But, deferring to the rules (note use of “must” 😄)

> Each local variable ([§14.4](https://docs.oracle.com/javase/specs/jls/se7/html/jls-14.html#jls-14.4)) and every blank `final` field ([§4.12.4](https://docs.oracle.com/javase/specs/jls/se7/html/jls-4.html#jls-4.12.4), [§8.3.1.2](https://docs.oracle.com/javase/specs/jls/se7/html/jls-8.html#jls-8.3.1.2)) must have a _definitely assigned_ value when any access of its value occurs.

[https://docs.oracle.com/javase/specs/jls/se7/html/jls-16.html](https://docs.oracle.com/javase/specs/jls/se7/html/jls-16.html)

---

<div class="post-metadata">

### Author: ![GoToLoop](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/gotoloop/32/86_2.png) [@GoToLoop](https://discourse.processing.org/u/GoToLoop)
#### Post date: [August 24, 2018, 11:48am UTC](https://discourse.processing.org/t/ask-how-to-use-an-array-of-double-in-java-processing/2908/20 "2018-08-24T11:48:48Z")

</div>

> [@neilcsmith](#):
>
> … when any access of its value occurs.

But as you can see, the **must** is accompanied by a **when** condition. 😛

Pretty much what I’ve stated already: 😇

> [@GoToLoop](#):
>
> Pedantic: Local variables can’t be accessed before being initialized w/ some value. 🧐

[Next page](https://discourse.processing.org/t/ask-how-to-use-an-array-of-double-in-java-processing/2908.md?page=2)