set multiple columns of matrix simultaneously

Hello,

I want to set multiple columns of a matrix to the same column vector. What I am currently doing is itterating over each column and changing them individually.

DM_sine = zeros(32);
for i=1:length(DM_sine);
  DM_sine(:,i) = sin(2*pi*i/32);
end

This does what I want, but seems massively inefficient and inelegant. Is there a better alternative?

Answer 1

[Star Strider]

Vectorise the first row, and then use repmat to duplicate it down the columns:

DM_sine = zeros(32);
i=1:length(DM_sine);
DM_sine = repmat(sin(2*pi*i/32), size(DM_sine,1), 1);
sample = DM_sine(1:5, 1:5)                                      % View Sample (Not Required)

sample =

        0.19509      0.38268      0.55557      0.70711      0.83147
        0.19509      0.38268      0.55557      0.70711      0.83147
        0.19509      0.38268      0.55557      0.70711      0.83147
        0.19509      0.38268      0.55557      0.70711      0.83147
        0.19509      0.38268      0.55557      0.70711      0.83147