MYROW is greater than or equal  to zero  and  less than
        NPROW.
</PRE>
<PRE>
MYCOL   (local input)                 const int
        On entry, MYCOL specifies my column process coordinate in the
        grid. MYCOL is greater than or equal  to zero  and  less than
        NPCOL.
</PRE>
<PRE>
NPROW   (global input)                const int
        On entry,  NPROW  specifies the number of process rows in the
        grid. NPROW is at least one.
</PRE>
<PRE>
NPCOL   (global input)                const 