I want to index across multiple dimensions using a vector, as opposed to comma notation

E.g.

I have a matrix A. This matrix will have a different number of dimensions depending upon what is input to my function.

I want to be able to use a vector(i.e. IndexingVector = [2 3 4 5]) to get the information I need:

A(IndexingVector) would be the same as saying A(2,3,4,5).

This means that if A happens to have a different number of dimensions when the function has different inputs, I could still use IndexingVector to get the information I need.

Thanks

Answer 1

[Stephen23]

Lets first create some fake data:

>> A = randi(9,4,3,2); % the data
>> V = [3,2,1]; % the indices in a vector
>> C = num2cell(V);
>> A(3,2,1) % writing it out
ans =
     7

Method One: a simple comma-separated list:

>> A(C{:})
ans =
    7

Method Two: use sub2ind:

>> A(sub2ind(size(A),C{:}))
ans =
     7

Method Three: call subsref directly:

>> subsref(A,struct('type','()','subs',{num2cell(V)}))
ans =
     7