milenko@milenkons:~/fcm10/bcg2$ ifort -c mvm.f90
mvm.f90(33): error #6636: This actual argument must be the name of a user subroutine or the name of intrinsic subroutine. [MATVEC]
call bicgstab2 (okprint,l, n, x, rhs,matvec, nonzero, tol,typestop,mxmv, work, ldw, info)
-------------------------------------^
compilation aborted for mvm.f90 (code 1)
I have problem with external function,I am attaching the code.
