Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

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

?lasorte

Sorts eigenpairs by real and complex data types.

Syntax

void
slasorte
(
float
*s
,
MKL_INT
*lds
,
MKL_INT
*j
,
float
*out
,
MKL_INT
*info
);
void
dlasorte
(
double
*s
,
MKL_INT
*lds
,
MKL_INT
*j
,
double
*out
,
MKL_INT
*info
);
Include Files
  • mkl_scalapack.h
Description
The
?lasorte
function
sorts eigenpairs so that real eigenpairs are together and complex eigenpairs are together. This helps to employ 2x2 shifts easily since every second subdiagonal is guaranteed to be zero. This
function
does no parallel work and makes no calls.
Optimization Notice
Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.
Notice revision #20110804
This notice covers the following instruction sets: SSE2, SSE4.2, AVX2, AVX-512.
Input Parameters
s
(local)
Array of size
lds
.
On entry, a matrix already in Schur form.
lds
(local)
On entry, the leading dimension of the array
s
; unchanged on exit.
j
(local)
On entry, the order of the matrix
S
; unchanged on exit.
out
(local)
Array of size 2*
j
. The work buffer required by the
function
.
info
(local)
Set, if the input matrix had an odd number of real eigenvalues and things could not be paired or if the input matrix
S
 was not originally in Schur form. 0 indicates successful completion.
Output Parameters
s
On exit, the diagonal blocks of
S
 have been rewritten to pair the eigenvalues. The resulting matrix is no longer similar to the input.
out
Work buffer.

Product and Performance Information

1

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