matlab - Create a horizontically stretched upper triangular matrix -


i'd create 4x12 matrix similar upper triangle matrix, looks this:

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

so question is. efficient way create it? no loops, no cellfun. thanks.

one vectorized approach -

nrows = 4; ncols = 12;  row_idx = repmat(1:nrows,ncols/nrows,1) out = bsxfun(@le,[1:nrows]',row_idx(:).')

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