How to Change Values of a Field by an Indexing Array?

Here’s my initial struct:

A(1).B.C = 'a';
A(2).B.C = 'b';
A(3).B.C = 'a';
A(4).B.C = 'a';

I want to change the values of C based on values of Values and indexes of IndexingArray:

Values = {'a', 'b'}
IndexingArray = [1 1 0 1];

So, my struct will be:

A(1).B.C = 'b';
A(2).B.C = 'b';
A(3).B.C = 'a';
A(4).B.C = 'b';

What is the solution?

Answer 1

[Chad Greene]

You could change each element individually via loop. But make sure you add 1 to the indexing array values because Matlab starts indexing at 1, not 0.

for k = 1:length(A) 
   A(k).B.C = Values(IndexingArray(k)+1); 
end

[Rightia Rollmann]

Thanks, but any way to get it done without a for loop?

[Jan]

@Rightia Rollmann: The nested struct is a complicated method to represent data. In consequence the method to access the values is not trivial anymore. This loop is efficient and compact. (+1)

Assumingly a typo:

A(k).B.C = Values{IndexingArray(k)+1};  % Curly braces

[Chad Greene]

Ah, yes, curly braces. Thanks for catching that Jan!