How do I repeat a column vector with a for loop?

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Janell Lopez 2016-2-20

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https://ww2.mathworks.cn/matlabcentral/answers/269169-how-do-i-repeat-a-column-vector-with-a-for-loop

评论： Star Strider 2016-2-20

Hi, I'm making a synthetic image for my class, and we have to use a for loop to do so. I have a column vector with the color values in it for one layer, but I need to make it into an mxn matrix so that I can stack them all together at the end for my image. How do I repeat this column vector left to right to make the matrix? I tried something like this:

bottomlayer=linspace(0,1,255);
greenlayer=bottomlayer;
bluelayer=fliplr(greenlayer);
redlayer=flipud(reshape(bottomlayer, [255,1]));
redfinal=zeros(256,256);
for i=1:256
    redfinal(:,i)=redlayer;
end

but that gives me an error: "Assignment has more non-singleton rhs dimensions than non-singleton subscripts".

What am I doing wrong? Thanks.

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Answer 1

Star Strider 2016-2-20

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https://ww2.mathworks.cn/matlabcentral/answers/269169-how-do-i-repeat-a-column-vector-with-a-for-loop#answer_210570

Your ‘redlayer’ vector is (255x1) and your ‘redfinal’ matrix is (256x256). That causes a dimension mismatch. One of them has to change dimension by 1, and you should be good to go.