Hello guys I am new to processing and I am finding it hard to understand the logic behind certain functions.

I am trying to create a simple scatter-plot graph to find the correlation between two entities and im using Ben Fry’s book to figure out the method. The method in Ben Fry’s book provides an example for Time Series;

1. FloatTable data;
2. float dataMin, dataMax;
3.  
4. float plotX1, plotY1;
5. float plotX2, plotY2;
6.  
7. int yearMin, yearMax;
8. int[] years;
9.  
10.  
11. void setup() {
12.   size(720, 405);
13.  
14.   data = new FloatTable("alcohol.tsv");
15.  
16.   years = int(data.getRowNames());
17.   yearMin = years[0];
18.   yearMax = years[years.length - 1];
19.  
20.   dataMin = 0;
21.   dataMax = data.getTableMax();
22.  
23.   // Corners of the plotted time series
24.   plotX1 = 50;
25.   plotX2 = width - plotX1;
26.   plotY1 = 60;
27.   plotY2 = height - plotY1;
28.  
29.   smooth();
30. }
31.  
32.  
33. void draw() {
34.   background(224);
35.  
36.   // Show the plot area as a white box
37.   fill(255);
38.   rectMode(CORNERS);
39.   noStroke();
40.   rect(plotX1, plotY1, plotX2, plotY2);
41.  
42.   strokeWeight(5);
43.   // Draw the data for the first column
44.   stroke(#5679C1);
45.   drawDataPoints(0);
46. }
47.  
48.  
49. // Draw the data as a series of points
50. void drawDataPoints(int col) {
51.   int rowCount = data.getRowCount();
52.   for (int row = 0; row < rowCount; row++) {
53.     if (data.isValid(row, col)) {
54.       float value = data.getFloat(row, col);
55.       float x = map(years[row], yearMin, yearMax, plotX1, plotX2);
56.       float y = map(value, dataMin, dataMax, plotY2, plotY1);
57.       point(x, y);
58.     }
59.   }
60. }

How should I modify this code to plot points for two float values(one depicting the x value and the other depicting the y value)? Any help would be much appreciated…