Convert vectors with different names to matrix

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salvor 2017-11-2

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https://ww2.mathworks.cn/matlabcentral/answers/364733-convert-vectors-with-different-names-to-matrix

编辑： Stephen23 2017-11-2

Hi guys,

I have n vectors (1x4000) whose names are a1, a2 up to an. I would like to create a matrix which is the rsult of vertcat(a1,a2,...,an). How can I do it without specifying the names of all the vectors in vertcat?

Thank you!

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salvor 2017-11-2

编辑：salvor 2017-11-2

It means that I have been given a set of 10 different vectors, each of them 1x4000 called a1, a2 up to a10. I want to create a matrix 10x4000 containing these 10 vectors.

Stephen23 2017-11-2

编辑：Stephen23 2017-11-2

@salvor: I asked how you are getting this data into your workspace: are you loading the data from a file, or running some function or script, or doing something else?

Data does not just magically appear in a workspace. Some operation has to put it there, like loading from a file. Please tell us how you get that data into your workspace. Then we can help you to write better code.

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采纳的回答

OCDER 2017-11-2

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https://ww2.mathworks.cn/matlabcentral/answers/364733-convert-vectors-with-different-names-to-matrix#answer_289078

在 MATLAB Online 中打开

You could use the workaround of save/load to get what you want.

%Suppose you have these a1, a2 ... an
a1  = rand(1, 4000);
a2  = rand(1, 4000);
a3  = rand(1, 4000);
a13 = ones(1, 4000);
save('TEMPFILE.mat', '-regexp', 'a\d+')  %saves variables with names a[number]
a = load('TEMPFILE.mat');  %loads into structure, a.a1, a.a2, a.a3, ...
delete('TEMPFILE.mat');    %delete temp mat file
anums = str2double(strrep(fieldnames(a), 'a', ''));  %get the nth number of a
[~, sortidx] = sort(anums);  %get the sort order. 1, 10, 2, 3 --> 1, 2, 3, 10
a = struct2cell(a);          %convert structure to cell
a = vertcat(a{sortidx});     %sort a in right order, and then combine vertically