descinit
Initializes the array descriptor for distributed
matrix.
Syntax
void
descinit
(
MKL_INT
*desc
,
const
MKL_INT
*m
,
const
MKL_INT
*n
,
const
MKL_INT
*mb
,
const
MKL_INT
*nb
,
const
MKL_INT
*irsrc
,
const
MKL_INT
*icsrc
,
const
MKL_INT
*ictxt
,
const
MKL_INT
*lld
,
MKL_INT
*info
);
Description
The
descint
function
initializes the array
descriptor for distributed matrix.Input Parameters
- desc
- (global) array of dimension DLEN_. The array descriptor of a distributed matrix to be set.
- m
- (global input) The number of rows in the distributed matrix. M >=0.
- n
- (global input) The number of columns in the distributed matrix. N >=0.
- mb
- (global input) The blocking factor used to distribute the rows of the matrix. MB >= 1.
- nb
- (global input) The blocking factor used to distribute the columns of the matrix. NB >= 1.
- lrsrc
- (global input) The process row over which the first row of the matrix is distributed. 0 <= IRSRC < NPROW.
- lcsrc
- (global input) The process column over which the first column of the matrix is distributed. 0 <= ICSRC < NPCOL.
- ictxt
- (global input) The BLACS context handle, indicating the global context of the operation on the matrix. The context itself is global.
- lld
- (local input) The leading dimension of the local array storing the local blocks of the distributed matrix. LLD >= MAX(1,LOCr(M)). LOCr() denotes the number of rows of a global dense matrix that the process in a grid receives after data distributing.
Output
Parameters
- info
- (output)= 0: successful exit< 0: if INFO = -i, the i-th argument had an illegal value