Assign elements in multidimensional struct to 2D array

Question

Collin 2022-9-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1805245-assign-elements-in-multidimensional-struct-to-2d-array

评论： Collin 2022-9-14

采纳的回答： James Tursa

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I have a 1xN multidimenstional struct, where each entry contains data of size 1xM.

for ii=1:5, C(ii).pts = rand(1,3); end

I would like an elegant way to get an NxM array as a concatinated output of the struct. Is this possible?

% Returns of size 1xMN 
[C.pts]
% Will not run but get something like this of size NxM
[c.pts']

Relevant questions:

https://www.mathworks.com/matlabcentral/answers/7155-elegant-way-to-extract-part-of-a-structure-as-an-array

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Stephen23 2022-9-14

编辑：Stephen23 2022-9-14

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You are not limited to only using square brackets for concatenation, you can use a comma-separated list with any operator or function that accepts those input arrays:

cat(1,C.pts)
vertcat(C.pts)

https://www.mathworks.com/help/matlab/matlab_prog/comma-separated-lists.html

https://www.mathworks.com/matlabcentral/answers/1656435-tutorial-comma-separated-lists-and-how-to-use-them

Collin 2022-9-14

This was exactly what I was looking for, thank you

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Answer 1

James Tursa 2022-9-14

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1805245-assign-elements-in-multidimensional-struct-to-2d-array#answer_1053455

编辑：James Tursa 2022-9-14

在 MATLAB Online 中打开

You can use the vercat( ) function to force the comma-separated-list generated by C.pts to stack vertically:

for ii=1:5, C(ii).pts = rand(1,3); end
vertcat(C.pts)
ans = 5×3
    0.5913    0.0767    0.8684
    0.9742    0.6071    0.1215
    0.7279    0.3782    0.8562
    0.0783    0.6597    0.9261
    0.9670    0.2707    0.2494