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<H2><A NAME="SECTION04446000000000000000">Array Descriptor for the Matrix of Right-Hand-Side Vectors</A></H2>
<P>
<A NAME="secdesc502"> </A>
<P>
The array descriptor <B>DESC_</B>
whose type is defined as
<B>DESC_(DTYPE_)=502</B><A NAME="3217"> </A>,
is an integer array of length 7.
This descriptor type is used in
the ScaLAPACK narrow band routines
and tridiagonal routines to specify
the block-row distribution of a global
array containing the right-hand-side
vectors over a one-dimensional
process grid. In the narrow band
and tridiagonal routines, a
one-dimensional block-column
distribution is specified for
the coefficient matrix<A NAME="3218"> </A>.
The matrix of right-hand-side
vectors however must be distributed
over a one-dimensional process grid
according to a block-row data
distribution scheme. Refer to
section <A HREF="node82.html#sec1dbd">4.4.1</A> for
further details on block data
distribution.
<P>
Let us now assume that we have an
array descriptor <I>DESCB</I> for a
block-row distributed matrix <I>B</I>.
For readability of the code, we have
associated symbolic names with the
descriptor entries.
<P>
<P><A NAME="3221"> </A><IMG WIDTH=626 HEIGHT=414 ALIGN=BOTTOM ALT="table3220" SRC="img355.gif"><BR>
<STRONG>Table 4.12:</STRONG> Content of the array descriptor for right-hand-side dense
matrices for narrow band and tridiagonal solvers<BR>
<P>
<P>
For a detailed description of
LOC<IMG WIDTH=6 HEIGHT=7 ALIGN=MIDDLE ALT="tex2html_wrap_inline12112" SRC="img15.gif">() notation, please
refer to section <A HREF="node83.html#secblockmap">4.4.2</A>.
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<P><ADDRESS>
<I>Susan Blackford <BR>
Tue May 13 09:21:01 EDT 1997</I>
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