Creating matrix with loops

Hello

I wanna creat a code for a loop for a matrix which creat nodal points (for 4 legs in 3d-koordinate system) in a matrix. I can make it creat the nodal point for 1 leg with this code:

le=1;

d=5;

for no=1:d

    x1=no*le;
    x2=(no-1)*le;
    x3=0
nodal(no,:) = [x1 x2 x3   % [nodal nr. x-koord. y-koord]
         ] ;
end  
disp(nodal);

but what i want it to restart after 5 point and make a matrix like this.

          1 0 0 0
          2 0 0 2
          3 0 0 4
          4 0 0 6
          5 0 0 8

          6 1 0 0
          7 1 0 2
          8 1 0 4
          9 1 0 6
          10 1 0 8

          11 0 1 0
          12 0 1 2
          13 0 1 4
          14 0 1 6
          15 0 1 8 

          16 1 1 0
          17 1 1 2
          18 1 1 4
          19 1 1 6
          20 1 1 8

I have tryed to make more loops, but nothing it working. I hope somebody can help - thanks!

Answer 1

[Laurent]

You don't need loops to get the matrix you want, you can make the individual columns by playing a bit around with divisions and rounding and then merge them all together.

y1=cumsum(ones(20,1));
y2=rem(floor((y1-1)/5),2);
y3=rem(floor((y1-1)/10),2);
y4=rem((y1-1)*2,10);

y=[y1 y2 y3 y4];