I am now have one column to fall apart individually. I'd like to have all of them  fall apart individually. 

float xs[];// introduce arry to store values

float ys[];

float zs[];

float rs[];

float squareSize = 20;//set the size of square 20X20

int cols ; // set column

int rows;  // set rows

int p;

int q;

boolean b= false;

void setup() {

  background(0);

  stroke(1);

  size (500, 500, P3D);

  cols =(int)( width / squareSize);

  rows = (int)(height / squareSize);

  xs = new float[cols*rows];

  ys = new float[cols*rows];

  zs = new float[cols*rows];

  rs = new float[cols*rows];

  for (int x=0;x<cols; x++) {

    for (int y=0;y<rows; y++) {

      int i =  x + y * cols;

      xs[i] = x * squareSize;

      ys[i] = y * squareSize; 

      zs[i] = 0;// exchange

      rs[i] = (xs[i]+ys[i]+10)*0.2;// change

    }

  }

}

void draw() {

  background(0);

  //frameRate (5);

  for (int x=0;x<cols; x++) {

    for (int y=0;y<rows; y++) {

      int i =  x + y * cols;

      fill(rs[i], 120, 100);      

      translate(0, 0, zs[i]);

      rect(xs[i], ys[i], squareSize, squareSize);

      translate(0, 0, -zs[i]);

    }

    if (!b) {

      

      

      if (mousePressed ==true) {

        frameRate(4);  

     

      

       

        

        for (p=0; p<620; p=p+25) {          

          ys[p] = ys[p]+random (1,4);          

          xs[p] = xs[p]+ random (1,4);

         zs[p] = 1;   

    

       }

       

I have modified my codes, but I have problem with the array. 

I need some help,please. 

Question:I created array dxs[] and dxy[] for the velocity of movement. 

But it could not be called after clicking the mouse. 

What should I do. 

Thanks in advance, 

SH

int[] dxs= new int[4]; // OK

// ...
}