MATLAB: How to write the matlab command for creating the nested structures

MATLAB

Hello,

I want to write the single Matlab command for creating the nested structures as below, instead of two commands (like a = struct(…))

a.b(1).c = struct('d',{1,2,3},'e',{4,5,6})

a.b(2).c = struct('f',{7,8,9},'g',{4,5,6})

Best Answer

In my opinion, you're better off sticking with what you have. It's a lot clearer than the one-liner. If you really want the one-liner, it's more of the same as what you've already written:

a = struct('b', struct('c',  {struct('d',{1,2,3},'e',{4,5,6}), struct('f',{7,8,9},'g',{4,5,6})}))

Related Solutions

MATLAB: Modify values in a struct array

newvalues = 1:3;
temp = num2cell(newvalues);
[a.b.c] = temp{:};

Unfortunately this is not easy to do on one line, at least not without using a helper function.

Expand = @(temp) temp{:};
[a.b.c] = Expand(num2cell(1:3));

MATLAB: How to Exclude Some Fields While Using the Function structfun

I assume this is related to your previous question. First, I'd like to point out that it doesn't look like a structure is the right container for your data. Since you want to do the same operations on all or most the fields, a cell array (or a matrix if the content of the fields is the same size) would be a lot better.

That's also the way to solve this particular problem. You can't do it with structfun.

A.B.C = [1 2 3];
A.B.D = [3 4 5];
A.B.E = [6 7 8]; 
c = struct2cell(A.B); %convert to cell array. In this particular case, a matrix would work even better
%you can then filter rows (fields) of the cell array any way you want,e .g.
fn = fieldnames(A.B);
filteredc = c(~ismember(fn, {'E', 'G'}));  %remove fields 'E' and 'G'
s = sum(cell2mat(filteredc))

Best Answer

Related Solutions

MATLAB: Modify values in a struct array

MATLAB: How to Exclude Some Fields While Using the Function structfun

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