How do I add NaNs to each of a set of vectors of different lengths to make them all the same length please?

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Michel Nieuwoudt
Michel Nieuwoudt 2016-8-18
评论： Bojie Sheng 2019-9-26
I have 13 columns that I'd like to put into a matrix, but they are different lengths. I can add NaN to them to make them the same length; if the max length is say 5000, how do I add NaNs to the others to make them all 5000 please?

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采纳的回答

Walter Roberson
Walter Roberson 2016-8-18
Matrix = nan(5000,13);
Matrix(1:length(FirstVariable), 1) = FirstVariable;
Matrix(1:length(SecondVariable), 2) = SecondVariable;
and so on.
If the values were in a cell array then there would be other methods available as well.

更多回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2016-8-18
编辑：Azzi Abdelmalek 2016-8-18
v1=(1:5)';
v2=(1:8)';
v3=(1:7)'
n=10
A={v1 v2 v3 }
out=cell2mat(cellfun(@(x) [x;nan(n-numel(x),1)],A,'un',0) )
Michel Nieuwoudt
Michel Nieuwoudt 2016-8-18
Thank you for your answer, however, I'm not sure I understand the last line. (I am still learning!)

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