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Combining two different size variables into one matrix

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Daria Ivanchenko
Daria Ivanchenko 2020-10-8
评论： Daria Ivanchenko 2020-10-8
Hi!
I have two variables of different size. Let's suppose A is the size of 1x5 and B is the size of 1x8. I want to make a matrix where the first row will be A, and the second raw will be B. The matrix should be the size of 2x8 where the last columns of the first row are replaced with NaNs. For example:
A = [1 2 3 4 5]
B = [1 2 3 4 5 6 7 8]
C = [1 2 3 4 5 NaN NaN NaN; 1 2 3 4 5 6 7 8]
How can I do this?
Thanks!

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采纳的回答

Stephen23
Stephen23 2020-10-8
The simplest solution is to download this:
https://www.mathworks.com/matlabcentral/fileexchange/22909-padcat
and then all you need is this:
>> A = [1,2,3,4,5];
>> B = [1,2,3,4,5,6,7,8];
>> C = padcat(A,B)
C =
1 2 3 4 5 NaN NaN NaN
1 2 3 4 5 6 7 8

更多回答（1 个）

Ameer Hamza
Ameer Hamza 2020-10-8
编辑：Ameer Hamza 2020-10-8
Try this
A = [1 2 3 4 5];
B = [1 2 3 4 5 6 7 8];
M = {A, B}; % combine all variables in a cell array
n = max(cellfun(@numel, M));
M = cellfun(@(x) {[x nan(1,n-numel(x))]}, M(:));
C = cell2mat(M);
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Ameer Hamza
Ameer Hamza 2020-10-8
My code works in this case too
A = [1 2 3 4 5 6 7 8; 1 2 3 4 5 NaN NaN NaN];
B = [1 2 3 4 5];
M = {A, B};
n = max(cellfun(@(x) size(x, 2), M));
M = cellfun(@(x) {[x nan(1,n-numel(x))]}, M(:));
C = cell2mat(M);
Result
>> C
C =
1 2 3 4 5 6 7 8
1 2 3 4 5 NaN NaN NaN
1 2 3 4 5 NaN NaN NaN

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