# Can I use the for loop to write 9 rows at the time?
**URL:** https://discourse.processing.org/t/can-i-use-the-for-loop-to-write-9-rows-at-the-time/28553
**Category:** Processing
**Created:** [March 15, 2021, 10:14pm UTC](https://discourse.processing.org/t/can-i-use-the-for-loop-to-write-9-rows-at-the-time/28553 "2021-03-15T22:14:46Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@laptophead](https://discourse.processing.org/u/laptophead)
#### Post date: [March 15, 2021, 10:14pm UTC](https://discourse.processing.org/t/can-i-use-the-for-loop-to-write-9-rows-at-the-time/28553/1 "2021-03-15T22:14:46Z")
I am writing to CSV and it goes well, but there is a lot of data I need to generated.
So I tried the for loop. But it writes and overwrites on the same first row instead of giving me 9 rows populated with individual data.
```auto
void SaveToFile ()
{ table.clearRows();
TableRow newRow = table.addRow();
newRow.setInt("MACH ID", table.getRowCount() - 1);
for (int i=1; i<=9; i++)
{
newRow.setInt("MACH ID", i);
newRow.setInt("CUMM UPTIME", CummUp[i]);
newRow.setInt("CYCLES TODAY", Cycles[i]);
newRow.setString("TIME", TimeStamp);
//newRow.setString("DATE", DateStamp);
}
////////////////////////
println("ROW COUNT= " + table.getRowCount());
Filename = "/data/"+"Infinity_Report_"+DateStamp + ".csv"; //DateStamp
saveTable(table, Filename);
//println("Settings Saved");
}
What to do?
Thanks
Mitch
```
---
### Author:  [@Chrisir](https://discourse.processing.org/u/Chrisir)
#### Post date: [March 15, 2021, 10:27pm UTC](https://discourse.processing.org/t/can-i-use-the-for-loop-to-write-9-rows-at-the-time/28553/2 "2021-03-15T22:27:25Z")
> [@laptophead](#):
>
> ```auto
> TableRow newRow = table.addRow();
>
>
> ```
move this after the for…{
**AND**
```auto
newRow.setInt("MACH ID", table.getRowCount() - 1);
```
delete this.
but KEEP:
```auto
newRow.setInt("MACH ID", i);
```
**Remark**
arrays usually start with 0, not 1, check your for-loop
---
### Author:  [@laptophead](https://discourse.processing.org/u/laptophead)
#### Post date: [March 15, 2021, 11:57pm UTC](https://discourse.processing.org/t/can-i-use-the-for-loop-to-write-9-rows-at-the-time/28553/3 "2021-03-15T23:57:32Z")
Yey, that worked…
Thanks , In my case I have to start with 1.
Danke Schoon
---
### Author:  [@laptophead](https://discourse.processing.org/u/laptophead)
#### Post date: [March 16, 2021, 12:34am UTC](https://discourse.processing.org/t/can-i-use-the-for-loop-to-write-9-rows-at-the-time/28553/4 "2021-03-16T00:34:35Z")
Since you’re so good with arrays, etc…
I am trying to get a time stamp when a condition from the serial happens and it works for a min, then I get a nullPointer.
Any ideas?
```auto
if ( list.length >=2 )
{
Mach_ID= int (list [0]);
LastUptime= int(trim(list [1]));
if (Mach_ID == 1)
{CummUp [1] = (CummUp [1]+ LastUptime)/1000;
Cycles [1] = (Cycles[1]+1);
TimeStampArrFun(1);
}
//// then the function
void TimeStampArrFun(int Mach_ID)
{
sec = second(); // Values from 0 - 59
min = minute(); // Values from 0 - 59
hrs = hour(); // Values from 0 - 23
day = day(); // Values from 1 - 31
mo = month(); // Values from 1 - 12
yr = year();
String S = str(sec); // Values from 0 - 59
String M = str(min);
String H = str(hrs); // Values from 0 - 59
String D = str(day);// Values from 0 - 59
String MO = str(mo); // Values from 0 - 59
String Y = str(yr);// Values from 0 - 59
TimeStampArr[Mach_ID] = H+":"+ nf(min,2)+":"+ nf(sec,2) +" ";
println (Mach_ID +"Stamp "+TimeStampArr[Mach_ID]);
}
```
What am I doing wrong?
The array is defined in the setup as :
String []TimeStampArr;
Also I tried to write the function as a String Arrray etc… trying to return the time stamp but it did not work out…
Thanks again
Mitch
---
### Author:  [@Chrisir](https://discourse.processing.org/u/Chrisir)
#### Post date: [March 16, 2021, 8:18am UTC](https://discourse.processing.org/t/can-i-use-the-for-loop-to-write-9-rows-at-the-time/28553/5 "2021-03-16T08:18:06Z")
I assume that you write over the end of the List
TimeStampArr
Like when you gave it an length of 500 when you try t
write element 501 it crashes
---
### Author:  [@Chrisir](https://discourse.processing.org/u/Chrisir)
#### Post date: [March 16, 2021, 8:28am UTC](https://discourse.processing.org/t/can-i-use-the-for-loop-to-write-9-rows-at-the-time/28553/6 "2021-03-16T08:28:10Z")
you don’t really need an array here
A simple string would be sufficient
---
### Author:  [@laptophead](https://discourse.processing.org/u/laptophead)
#### Post date: [March 16, 2021, 5:35pm UTC](https://discourse.processing.org/t/can-i-use-the-for-loop-to-write-9-rows-at-the-time/28553/7 "2021-03-16T17:35:39Z")
Actually I need the array, there are 10 different time stamps.
The probelm was in declaring the array in the definition.
I tried the easy
String []TimeStampArr;
but it did not work, so I had to go the long way:
String TimeStampArr[]= {" ", " ", " ", " ", " ", " ", " ", " ", " ", " "};// 10 vals
Now it works. Lots more code…
Thanks