Create a Slanted Linspace Matrix

Hi All, I am trying to generate noise in an image, and need a matrix of the form:

1 2 3 4

2 3 4 5

3 4 5 6

4 5 6 7

up to 1024x1024. Is there an east way to create this?

Answer 1

[Stephen23]

hankel(1:4,4:7)

ans = 4×4

1 2 3 4 2 3 4 5 3 4 5 6 4 5 6 7

Answer 2

[Daniel Pollard]

If you have the signal processing toolbox, the buffer command will do exactly what you want.

If not, something like

x = linspace(xmin, xmax, numx);
matrix = zeros(numx, numx);
for ii = 1:numx
    matrix(:, ii) = x + ii - 1;
end

should do the trick.