How can I extract single value out of a matrix using vectors?

Question

Ziyu Wang 2018-1-30

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回答： Harish Ramachandran 2018-2-2

Hello Matlab community,

For my program, I would like to use a vector as index to read value in a matrix. Given A, a matrix that can also have more than 2 dimensions and v, a col-vector. E.g.:

A = magic(4); v = [2;3]; 
n = A(2,3); % value I want to read

Assuming the format is correct, i.e. dim(A) = size(v,1) and the values in v do not go beyond the corresponding size in A and consist of only integers, how can I read n using only v?

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Answer 1

Harish Ramachandran 2018-2-2

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A trivial implementation involves something along the lines of:

A = magic(4); 
v = [2;3]; 
A =
      16     2     3    13
       5    11    10     8
       9     7     6    12
       4    14    15     1
A(v(1),v(2))
ans =
      10