Developer Reference

  • 2021.1
  • 12/04/2020
  • Public Content
Contents

?large

Pre- and post-multiplies a real general matrix with a random orthogonal matrix.

Syntax

void slarge
(
lapack_int
*n
,
float
*a
,
lapack_int
*lda
,
lapack_int
*iseed
,
float
*
work
,
lapack_int
*info
);
void dlarge
(
lapack_int
*n
,
double
*a
,
lapack_int
*lda
,
lapack_int
*iseed
,
double
*
work
,
lapack_int
*info
);
void clarge
(
lapack_int
*n
,
lapack_complex
*a
,
lapack_int
*lda
,
lapack_int
*iseed
,
lapack_complex
*
work
,
lapack_int
*info
);
void zlarge
(
lapack_int
*n
,
lapack_complex_double
*a
,
lapack_int
*lda
,
lapack_int
*iseed
,
lapack_complex_double
*
work
,
lapack_int
*info
);
Include Files
  • mkl.h
Description
The routine
?large
pre- and post-multiplies a general
n
-by-
n
matrix
A
with a random orthogonal or unitary matrix:
A
=
U
*
D
*
U
T
.
Input Parameters
n
The order of the matrix
A
.
n
0
a
Array, size
lda
by
n
.
On entry, the original
n
-by-
n
matrix
A
.
lda
The leading dimension of the array
a
.
lda
n
.
iseed
Array, size 4.
On entry, the seed of the random number generator. The array elements must be between 0 and 4095, and
iseed
[3]
must be odd.
work
Workspace array, size 2*
n
.
Output Parameters
a
On exit,
A
is overwritten by
U
*
A
*
U
'
for some random orthogonal matrix
U
.
iseed
On exit, the seed is updated.
info
If
info
= 0
, the execution is successful.
If
info
< 0
, the
i
-th parameter had an illegal value.

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.