how to concatenate matrix horizontally for a large number of matrices in a for loop

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Taoooooooooooo
Taoooooooooooo 2019-2-28
回答： Walter Roberson 2019-3-1
For example,
I am doing data analysis of a matrix of A whose dimension is 175x90. Since I analyze this dataset one by one such that A(:,1), A(:,2)...A(:,90). In the end, I hope I could still obtain a matrix of of B whose dimension is also 175x90. So I decided to use "horzcat" command such that B=horzcat(A(:,1), A(:,2)...A(:,90)). However, since there could be a really large number for me to concatenate, how can I achieve this in a loop rather than do this manually?
Thank you so much!
  2 个评论
Taoooooooooooo
Taoooooooooooo 2019-3-1
Hi Walter,
Thanks for answering. However, since I was supposed to anaylize the data one by one, and the final output becomes (175x1) instead (175x90). Therefore, I need a for loop to combine them back to the same dimension of the original file.
Tao

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回答（1 个）

Walter Roberson
Walter Roberson 2019-3-1
numrow = size(A,1);
numcol = size(A,2);
B = zeros(numrow, numcol)
for column = 1 : numcol
this_column = A(:,column);
.....
this_result = ...
B(:,column) = this_result;
end

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