Possible to use algebraic expression as array subscript?

1

Dear Fortran community,
is it possible to use an algebraic expression of integers as the subscripts of an array A, for accessing or for manipulating elements of an array?
I would like to implement following code:
DO i = 1,N1
DO j = 1,N2
A((i+j),((i-1)*(j-1)+j)) = ...
END DO
END DO

It appears that the compiler requires, that the resulting indices are not out of the range which was used to initalize the matrix.
Thank you

2

Yes. Integer valued expressions are fine as subscript values. Those values are required to be within the range [lower_bound, upper_bound] for each dimension. That is a standard requirement, which some compilers enforce.

3

Thank you @billlong, this clarifies it