Line Graph - ArrayIndexOutOfBoundsException: 570

Processing Coding Questions
1

Hello, I’m following a tutorial on making a dynamic linegraph whilst using my own data. I’ve come across an error which I’m unable to fix myself and would really appreciate some fresh eyes on this :slight_smile:

I know I’m doing something wrong with my array values, but I can’t work out where I’m going wrong.

Main Sketch:

String filename = "Simplified 2019 + 2020 Steps Data.csv";
String[] rawData;



void setup(){
processData();
  
}

void draw() {
  
  
  
}

void processData(){
    rawData = loadStrings(filename);
  for(int i = 1; i < rawData.length; i+=9) {
    Year y = new Year();
    for (int j = 1; j < 9; j++) {
   String[] thisRow = split(rawData[i+j], ",");
   println(thisRow[1]);
    
  }
 }
}

Tab 2 (“Year”)

class Year {
  
  // variables
  int level;
  int[] months = {1, 2, 3, 4, 5, 6, 7, 8, 9};
 int [] steps = new int[9];
  
  // constructor
  Year() {
 
  }
  // functions
  
}

And for good measure, here is a screenshot of some of my data (since I can’t upload the CSV file):

Screenshot 2021-01-15 at 11.58.08
Screenshot 2021-01-15 at 11.58.08714×1422 112 KB

I know this is something very simple I’m overlooking, but I thank you heaps if you are able to help me on this! :slight_smile:

2

this is causing your ArrayIndexOutOfBoundsException?

Surround the lines with if (i+j < rawData.length) {…}

because of the i+=9 you will probably go over the end of the array

4

Thanks so much for getting back to me! Sorry for being dumb, but could you please show me an example? Is it like this:

if(int i = 1; i < rawData.length; i+=9) {
Year y = new Year();
for (int j = 1; j < 9; j++) {
String[] thisRow = split(rawData[i+j], “,”);
println(thisRow[1]);

}
}

I tried it this way, but it is saying I’ve got an unexpected token, I think I’ve done it wrong haha

Do you know if I could change my array number to fix it at all? My months go up to 9, so I’ve tried making the value “8” since I know an array counts from 0, but that didn’t work either

5 




void processData() {
  rawData = loadStrings(filename);
  for (int i = 1; i < rawData.length; i+=9) {
    Year y = new Year();
    for (int j = 1; j < 9; j++) {

      if (i+j < rawData.length) {// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

        String[] thisRow = split(rawData[i+j], ",");
        println(thisRow[1]);
      } // new if/////////////////////////////
    }//for
  }//for
}//func
6

You are a genius, thank you so much! I really appreciate it :smile:

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