Create an array that has ones

Hello,

I am trying to create a 1x256 cell array where each matrix inside is 256x41. I want each matrix to have a row of ones and the rest zeroes. For example, the first matrix will have the first row be ones and the rest zeroes. The second matrix will have the second row be all ones with the first row and all the rows after the second row be zeroes. Help? I'd like to loop this.

Thanks

Answer 1

[Azzi Abdelmalek]

A=arrayfun(@(x)  circshift([zeros(1,41);ones(255,41)],[x 1]),1:255,'un',0)

[Sean Raffetto]

Thanks! This helps a lot!

Answer 2

[Andrei Bobrov]

num2cell(permute(repmat(eye(256),1,1,41),[1,3,2]),[1,2])

or

num2cell(bsxfun(@eq,(1:256)'*ones(1,41),reshape(1:256,1,1,[])),[1,2])

or

m = 256;
n = 41;
a = [ones(1,n);zeros(m,n)];
C = cell(m,1);
for jj = 1:m
    ii = jj + 1;
    a([jj,ii]) = a([ii,jj]);
    C{jj} = a(2:end,:);
end