store all array values in a field to a variable

Question

Rakesh Praveen 2014-1-28

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https://ww2.mathworks.cn/matlabcentral/answers/114034-store-all-array-values-in-a-field-to-a-variable

评论： Azzi Abdelmalek 2014-1-28

I have a test.mat file which contains 1x10 struct array values with 5 fields. The first field 'f' ie,. 'test.f' contains struct array with a dimension of [2x1 double]. I wanted to store all these 10 [2x1 double] values to another variable 'f_vec'. I tried 'getfield'

f_vec = getfield(test,'f')

but it gives out only 1 [2x1 double] value and not all the values from the struct array. when I tried the below command, I got an error.

f_vec = test.f(1,:)
??? Field reference for multiple structure elements that is followed by more
reference blocks is an error.

So all I wanted to do is to store all the [2x1 double] values from 'f' to f_vec. How do I do it ? Thank you.

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Answer 1

Walter Roberson 2014-1-28

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https://ww2.mathworks.cn/matlabcentral/answers/114034-store-all-array-values-in-a-field-to-a-variable#answer_122509

在 MATLAB Online 中打开

f_vec = horzcat( test.f ); %would give you 2 x length(test) array

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Rakesh Praveen 2014-1-28

Thank you. Your solution fixed my problem.

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Answer 2

Azzi Abdelmalek 2014-1-28

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https://ww2.mathworks.cn/matlabcentral/answers/114034-store-all-array-values-in-a-field-to-a-variable#answer_122505

编辑：Azzi Abdelmalek 2014-1-28

在 MATLAB Online 中打开

v=struct('a',num2cell(1:10)','f',num2cell(rand(2,10),1)')
out=reshape([v.f],2,10)'

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Rakesh Praveen 2014-1-28

when I tried your solution, i had an error saying: 'To RESHAPE the number of elements must not change'. walter solution fixed my problem.

Azzi Abdelmalek 2014-1-28

Because you didn't adapt my code to your problem.

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