 int
        On entry,  J  specifies the global column index of the matrix
        entry. J must be at least zero.
</PRE>
<PRE>
IMB     (global input)                const int
        On entry,  IMB  specifies  the size of the first row block of
        the global matrix. IMB must be at least one.
</PRE>
<PRE>
MB      (global input)                const int
        On entry,  MB specifies the blocking factor used to partition
        and  distribute the rows of the matrix A.  MB  must be larger
        than