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<H2><A NAME="SECTION04451000000000000000">Array Descriptor for Out-core Dense Matrices</A></H2>
<A NAME="secdesc601"> </A>
<P>
The array descriptor <B>DESC_</B>
whose type is defined as
<B>DESC_(DTYPE_)=601</B><A NAME="3360"> </A>,
is an integer array of length 11.
<B>DESC_(DTYPE_)=601</B><A NAME="3362"> </A>
is used for the ScaLAPACK routines
involved in the out-of-core solution
of dense linear systems using LU, QR
or Cholesky factorizations [<A HREF="node189.html#lawn118">55</A>].
The matrix stored on disk is composed
of records each record of which corresponds
to an MMB <IMG WIDTH=9 HEIGHT=16 ALIGN=MIDDLE ALT="tex2html_wrap_inline12420" SRC="img42.gif"> NNB <B>DESC_(DTYPE_)=1</B>
ScaLAPACK matrix and these records
are organized in a column major
(Fortran array) manner. The array
descriptor for out-of-core matrices
has extra fields to store file
parameters associated with the
matrix, such as the I/O device
unit number, MMB and NNB, and
the amount of temporary buffer
storage available.
<P>
Similar to <B>DESC_(DTYPE_)=1</B>
symmetric ScaLAPACK matrices, only
the upper (UPLO='U') triangle or
the lower (UPLO='L') triangle is
accessed. The entire coefficient
matrix is stored on disk, regardless
of whether the matrix is nonsymmetric
or symmetric.
<P>
<P><A NAME="3367"> </A><IMG WIDTH=653 HEIGHT=544 ALIGN=BOTTOM ALT="table3366" SRC="img356.gif"><BR>
<STRONG>Table 4.13:</STRONG> Content of the array descriptor for out-of-core dense matrices<BR>
<P><BR> <HR>
<P><ADDRESS>
<I>Susan Blackford <BR>
Tue May 13 09:21:01 EDT 1997</I>
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