How can I create a matrix using nested loop functions?

Hi, I'm trying to create a matrix of X and Y coordinates of nodes which are equally separated on a plane. The function should give coordinates for each node and write them all as a single matrix. It should start from zero, then it should go up along the Y-coordinate with a step of 'h' and it should write the coordinates into a corresponding row of a matrix with 2 columns (X and Y). When it reaches some value 'H' it should move by 'w' along the X-axis and start writing the coordinates of Y again (starting from zero).

Here is the code I wrote:

   for i=1:Nw+1;
       wi=0:w:W;
       X=wi;
      for n=1:Nh+1
          hi=0:h:H;
          Y=hi;
          NC=[X(i) Y(n)]
      end
   end

This function works fine except for the fact that for each cycle it produces a separate 1x2 matrix, so for Nw=Nh=2 i get the results are presented by 9 separate matrices:

NC = 0   0
NC = 0   h
NC = 0   H
NC = w   0
NC = w   h
NC = w   H
NC = W   0
NC = W   h
NC = W   H

The values are exactly the ones I want, but I need them to be written in a single matrix of 2 columns and 9 rows (for this example). Nh, Nw and W, H are user's inputs. Also h=H/Nh and w=W/Nw.

I tried specifying the number of rows which is given by (Nh+1)*(Nw+1) and then write the values into each row, but I did not succeed.

So can anyone give me an idea of how I can do this?

Thanks.

Answer 1

[Mahdi]

With making the least amount of changes to your code, add this line before the for loop

NC=[];

And change the NC=[X(i) Y(n)] to

NC=[NC; X(i) Y(n)];

In the end, type NC to see the resultant matrix.

[Vitaly]

It seems to be working, thanks.