SUM (intrinsic) function FORTRAN

VasanthG

Hi,
I am using two do loops to calculate a value U(i,j). When I sum using the "sum" comman a=sum(U), it is giving me zero as result. I manually added up the elements and the result is not zero.
The "sum" results in a scalar, right? So, I made "a" as REAL variable.
Where am I wrong? Any suggestions.

I don't know to delete the post, consider in deleted. Got the culprit. I made error in allocation of the array.