check_var

INTERFACE:

   subroutine check_var(ncid, varname, varid, readvar, usepio)

DESCRIPTION:

Check if variable is on netcdf file

ARGUMENTS:

     implicit none
     integer, intent(in)          :: ncid
     character(len=*), intent(in) :: varname
     integer, intent(out)         :: varid
     logical, intent(out)         :: readvar
     logical,optional,intent(in)  :: usepio    ! use pio lib

REVISION HISTORY:

LOCAL VARIABLES: