MATLAB: Creating a large matrix with a pattern

Question

Hi,

I would like to create a 800×200 matrix which looks like:

     1     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0
     1     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0
     1     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0
     0     1     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0
     0     1     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0
     0     1     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0
     0     0     1     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0

To put in in words, every new column should start with the column [1 1 0 1].' when the other is finished.

Tried to do this with toeplitz. However this results in only 1 step change of columns e.g.

     1     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0
     1     1     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0
     0     1     1     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0
     1     0     1     1     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0
     0     1     0     1     1     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0
     0     0     1     0     1     1     0     0     0     0     0     0     0     0     0     0     0     0     0     0
     0     0     0     1     0     1     1     0     0     0     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     1     0     1     1     0     0     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     1     0     1     1     0     0     0     0     0     0     0     0     0     0     0

This is not what I desire. Does anyone know another way to do this?

Answer 1

Hi bus14,

Try this:

m=zeros(804,200);
m([1,2,4],:)=1;
m2=reshape(m,800,[]);
m2(:,201)=[];