MATLAB: How to call a certain part of a matrix which is a value of a field of a structure

structure arrays

What I want to do is to access the first column and then the second column of a 5-by-7 matrix which is the value of a field named B. B is the third field of struct A. How can I do it dynamically best?

Best Answer

Your description is really not clear. An example would help.

Get 2nd and 3rd column of matrix stored in field 'B' of structure A, regardless of the order of fields:

A.B(:, [2 3])

Get 2nd and 3rd column of matrix stored in the 3rd field of structure A, regardless of the names of the fields

fn = fieldnames(A);
A.(fn{3})(:, [2 3])

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MATLAB: Swap rows and columns of a matrix

x = [2 1 3];
A_New = A(x,x);

MATLAB: How to assign the same value to every field, including nested fields of a structure

   A = structfun(@(s) layer2(s,x), 'Uniform', 0);

together with

   function r = layer2(s, x)
     if istruct(s)
       fn = fieldnames(s);
       r = cell2struct( repmat({x}, length(fn), 1), fn, 1);
     else
       r = x;
     end
  end

Best Answer

Related Solutions

MATLAB: Swap rows and columns of a matrix

MATLAB: How to assign the same value to every field, including nested fields of a structure

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