Insert array into matrix within a loop
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I have a matrix X (N,100), i have a function which calculate for each column of X another array h(1,50), a would like to calculate for each column of X(N,:) a vector h and making them all in a matrix H(100,50). Can someone help
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Andrei Bobrov
2018-1-30
编辑：Andrei Bobrov
2018-1-30
m = size(X,2);
out = zeros(m,50);
for ii = 1:m
out(ii,:) = your_function(X(:,ii));
end
4 个评论
tilfani oussama
2018-1-30
Jos (10584)
2018-1-30
Andrei made a small mistake:
use out(ii,:) = ...
rather than out(m,:) = ...
tilfani oussama
2018-1-30
Andrei Bobrov
2018-1-30
Thank you Jos! I am corrected.
更多回答（1 个）
Jos (10584)
2018-1-30
Just to make sure: X has 100 columns, You have a function that takes a column and returns a row-vector of 50 columns. And now you want to do this for each column of X and stack all results in a 100-by-50 array. Something like this will help you:
myfun = @(c) [1:50] * mean(c(:)) ;
% just a function that takes a (column) vector and returns a 1-by-50 vector
C = arrayfun(@(k) myfun(X(:,k)), 1:size(X,2), 'un', 0) ; % apply to each column of X
h = cat(1,C{:}) ; % stack each 1-by-50 cell into an array
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