Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

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.
Product and Performance Information
Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.
Notice revision #20201201
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.