Need help loading array for XY chart

rockytopt..

Need help loading array for XY chart

in Contributed Library Questions • 1 year ago

So I need some help loading data into array for use with giCentreUtils XY Chart. I keep getting "ArrayIndexOutOfBoundsException: 3. Its shown below, I highlighted the line I get the error on. The file I am trying to read in is here: Ferm.txt.

Any help is greatly appreciated.

import org.gicentre.utils.stat.*;    // For chart classes.

// Sketch to demonstrate the use of the XYChart class to draw simple line charts.
// Version 1.0, 27th May, 2010.
// Author Jo Wood.

XYChart lineChart;

/** Initialises the sketch, loads data into the chart and customises its appearance.
*/

String[] lines;
float x = 0;
float y = 0;
int count = 0;

import processing.serial.*;
Serial myPort;
BufferedReader reader;

void setup()
{
lines = loadStrings("Ferm.txt");
size(800,700);
smooth();
noLoop();

PFont font = createFont("Helvetica",11);
textFont(font,10);

float [] Xdata = new float [lines.length];
float [] Ydata = new float [lines.length];
for (int i = 1; i < lines.length; i++) {
    String[] pieces = split(lines[i], ",");
     x = float(pieces[3]);
     y = float(pieces[6]);
      Ydata[i] = y;
      Xdata[i] = x;
    }

// Both x and y data set here.
lineChart = new XYChart(this);
lineChart.setData(Xdata, Ydata);


// Axis formatting and labels.
lineChart.showXAxis(true);
lineChart.showYAxis(true);
lineChart.setMinY(0);

lineChart.setYFormat("00.00"); // Monetary value in $US
lineChart.setXFormat("00.00");      // Year

// Symbol colours
lineChart.setPointColour(color(180,50,50,100));
lineChart.setPointSize(5);
lineChart.setLineWidth(2);
}

/** Draws the chart and a title.
*/
void draw()
{
background(255);
textSize(9);
lineChart.draw(15,15,width-30,height-30);

// Draw a title over the top of the chart.
fill(120);
textSize(20);
text("Fermentation Temp", 70,30);
textSize(11);
//text("Gross domestic product measured in inflation-corrected $US", 70,45);
}

Replies(1)

PhiLho

Re: Need help loading array for XY chart

1 year ago

It is a perfect illustration of what I wrote in the https://forum.processing.org/topic/where-to-place-threads-and-other-forum-practices thread: you have a pure Java problem, but I must move the topic here because you keep a library that prevent people like me (without the library) to run your code. Not to mention the serial library which doesn't seem used.

Anyway, you should print out the faulty line. Perhaps it happens on the last line of the file, which might be empty. You can check lines[i].length and stop the loop in this case.

Last advice: don't put code before the call to size().

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