Need help with solving ArrayIndexOutOfBoundsException:-1

nighrage

Need help with solving ArrayIndexOutOfBoundsException:-1

in Contributed Library Questions • 2 years ago

I am trying to create a scatter plot diagram but I am stuck half way through. The error message( ArrayIndexOutOfBoundsException:-1) seems to arise from the line in 30. I cant seem to figure out what the problem is, any help would be much appreciated.

import org.gicentre.utils.stat.*; // For chart classes.
import org.gicentre.utils.colour.*; // For colour tables.
XYChart scatterplot; // The data chart.
float[] colours; // Point colours.
void setup()
{
size(400,400);
smooth();
scatterplot = new XYChart(this);
readData(2,3,scatterplot); // Read data from columns 1 and 3.
// Set up scatterplot's appearance.
scatterplot.setMinX(0);
scatterplot.setMinY(0);
scatterplot.showXAxis(true);
scatterplot.showYAxis(true);
scatterplot.setXAxisLabel(">15");
scatterplot.setYAxisLabel("<15");
ColourTable cTable = ColourTable.getPresetColourTable(ColourTable.ACCENT_3);
scatterplot.setPointColour(colours,cTable);
scatterplot.setPointSize(5);
}
void draw()
{
background(255);
scatterplot.draw(10,10,width-20,height-20);
}

Replies(2)

quarks

Re: Need help with solving ArrayIndexOutOfBoundsException:-1

2 years ago

I suggest that the problem is line 24 where you are using the array colours which you declared in line 4 but I can't see any code to create the array before you use it in line 24.

At that point colours will have the value null and I would have expected a null reference exception rather that array out of bounds exception but I suppose it depends on the library code for drawing the scatter plot.

nighrage

Re: Need help with solving ArrayIndexOutOfBoundsException:-1

2 years ago

Thanks a lot mate. Sorted the issue.

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