how can I write all for loop outputs in single matrix?

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frwmetric 2013-5-19

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https://ww2.mathworks.cn/matlabcentral/answers/76317-how-can-i-write-all-for-loop-outputs-in-single-matrix

编辑： Lottie Wardman 2021-10-6

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how can I write all for loop results in single matrix?

For example

ans =
    -2    -2    -1
    -2    -2     1
    -2     2    -1
    -2     2     1
     2    -2    -1
     2    -2     1
     2     2    -1
     2     2     1
ans =
     0     0    -3
     0     0     3

I want to get a result such as

ans =
    -2    -2    -1
    -2    -2     1
    -2     2    -1
    -2     2     1
     2    -2    -1
     2    -2     1
     2     2    -1
     2     2     1
     0     0    -3
     0     0     3

回答（2 个）

Azzi Abdelmalek 2013-5-19

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编辑：Azzi Abdelmalek 2013-5-19

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For vertical concatenation

A=[1 2 3;4 5 6;7 8 9]
B=[10 20 30;40 50 60]
out=[A;B]

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Azzi Abdelmalek 2013-5-19

What is the problem with your previous comment?

Lottie Wardman 2021-10-6

编辑：Lottie Wardman 2021-10-6

Hi,

Thought I would jump in as I'm having the same difficultly. The loop produces say 21 results, all labelled 'A'. Vertical concatination would work, but as all outputs are produced at once, it's not possible (or practical) to label each output with an alternative letter.

TIA

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Andrei Bobrov 2013-5-20

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Try this construct

out = [];
for jj = ...
    % here your execution
    A = ...
    out = [out;A];
end

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Lottie Wardman 2021-10-6

Hi,

Sorry I'm very new to MATLAB, please could you explain a little more? I can't seem to use the above to 'join' all the loop results in a single matrix.

TIA

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