Hi,

The following code produces an array of numbers. But there seem to be numbers over numbers and I am not sure how to fix this.

I think the problem may be to do with the fact that the two functions are called from inside draw() and so are endlessly running. I tried placing the call to them outside of this but inside draw() seems to be the only place i can get them to work.

Any help would be greatly appreciated.

Thanks,

Shane

1. int cols = 5;
   int rows = 10;
   int xn0 = 1;
   int yn0 = 1;
   float h = 0.1;
   float[][] myArray = new float[cols][rows]; // declares array
   
   void setup() {
     size(400, 400);
     background(255);
     fill(0);
   }
   
   void draw() {
     populateArray();
     readArray();
   }
   
   void populateArray() {
     for (int i = 0; i < cols; i++) {
       for (int j = 0; j < rows; j++) {
         if (j==0);
         {
           myArray[1][0] = xn0;
           myArray[2][0] = yn0;
         }
         if (i==0) // first column
         {
           myArray[i][j] = j+1;
         }
         if ((i==1) && (j!=0)) // xn values, adds h to the previous xn value
         {
           myArray[i][j] = h + myArray[i][j-1];
         }
         if ((i==2) && (j!=0)) // yn values, previous yn value
         {
           myArray[i][j] = myArray[i+2][j-1];
         }
         if (i==3) // fn values, fn = (xn^3 - yn)/xn
         {
           myArray[i][j] = (pow(myArray[i-2][j], 3) - myArray[i-1][j])/myArray[i-2][j];
         }
         if ((i==4)) // y_{n+1} values, yn+1 = yn + h*fn
         {
           myArray[i][j] = myArray[i-2][j] + h*myArray[i-1][j];
         }
       }
     }
   }
   
   void readArray() {
     for (int i = 0; i < cols; i++) {
       for (int j = 0; j < rows; j++) {
         if (j==0);
         {
           text(myArray[i][j], ((i+1)*40), ((j+1)*20)+20);
         }
       }
     }
     text("n", 50, 15);
     text("xn", 90, 15);
     text("yn", 130, 15);
     text("fn", 170, 15);
     text("y_{n+1}", 210, 15);
     line(40, 23, 250, 23);
     line(80, 5, 80, (rows*20)+30);
   }