Evaluating an array with another array?

I was curious what it means when we have that 3 arrays and,

Array = zeros(N,P,M);

Arr_tmp = zeros(N,P,M);

Array_2 = zeros(N,P,M);

.......

......

Array = Arr_tmp(Array_2)

The "....." mean intermediate calculations, which are not of importance. What I am confused by is what it means when you have a 3 parameter array but you evaluate it as a one parameter array. Is there a more enumerative equivalent?

[Stephen23]

Array = zeros(N,P,M); % does nothing in this example.
Arr_tmp = zeros(N,P,M);
Array_2 = zeros(N,P,M);
.......
......
Array = Arr_tmp(Array_2)

'The "....." mean intermediate calculations, which are not of importance.'

Those calculations are important, otherwise attempting to use zeros as linear indices would throw an error.

Answer 1

[DGM]

That would be the use of linear indices:

https://www.mathworks.com/company/newsletters/articles/matrix-indexing-in-matlab.html

The linear indices of an array begin at A(1,1,1,...,1) and progress linearly columwise from there, to a maximum index equal to the number of elements in A.