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! minimal Scalapack demo
implicit none
integer :: ictxt, myid, nprocs, mycol, myrow, npcol, nprow
real :: eps
real, external :: pslamch
! arbitrary test parameters
npcol = 2
nprow = 2
call blacs_pinfo(myid, nprocs)
call blacs_get(-1, 0, ictxt)
call blacs_gridinit(ictxt, "C", nprocs, 1)
call blacs_gridinfo(ictxt, nprow, npcol, myrow, mycol)
eps = pslamch(ictxt, 'E')
if(myrow == mycol) print '(A, F10.6)', "OK: Scalapack Fortran eps=", eps
call blacs_gridexit(ictxt)
call blacs_exit(0)
end program