Access element of ND array specified by another array?

I have a N1 x N2 x N3 dimension Tensor T. Plus I have a 1 x 3 array a = [a1 a2 a3]. How do I access element T(a1,a2,a3). Is there any way to do this for N dimension.

Answer 1

[Walter Roberson]

acell = num2cell(a);
T(acell{:})

There are also ways to calculate the location as a linear index based upon size(T)

Ts = size(T):
La = length(a);
Ts(end+1:La) = 1;
idx = a(1) + sum((a(2:end)-1) .* cumprod(Ts(1:La-1)))
T(idx)

... if I didn't miss something.

[Rohit Gupta]

Thanks! I wanted to avoid doing something you mentioned below. First solution works.

Answer 2

[James Tursa]

doc sub2ind

[Rohit Gupta]

Thanks! But it also needs giving a1,a2,a3 and wont work for any general dimension.