The array descriptor **DESC_**
whose type is defined as
**DESC_(DTYPE_)=601** ,
is an integer array of length 11.
**DESC_(DTYPE_)=601**
is used for the ScaLAPACK routines
involved in the out-of-core solution
of dense linear systems using LU, QR
or Cholesky factorizations [55].
The matrix stored on disk is composed
of records each record of which corresponds
to an MMB NNB **DESC_(DTYPE_)=1**
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.

Similar to **DESC_(DTYPE_)=1**
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.

**Table 4.13:** Content of the array descriptor for out-of-core dense matrices

Tue May 13 09:21:01 EDT 1997