Developer Reference

  • 2020.2
  • 07/15/2020
  • Public Content
Contents

dlat2s

Converts a double-precision triangular matrix to a single-precision triangular matrix.

Syntax

call dlat2s
(
uplo
,
n
,
a
,
lda
,
sa
,
ldsa
,
info
)
Include Files
  • mkl.fi
Description
This routine converts a double-precision triangular matrix
A
to a single-precision triangular matrix
SA
.
dlat2s
checks that all the elements of
A
are between
-RMAX
and
RMAX
, where
RMAX
is the overflow for the single-precision arithmetic. If this condition is not met, the conversion is aborted and a flag is raised. The routine does no parameter checking.
Input Parameters
uplo
CHARACTER*1
.
Specifies whether the matrix
A
is upper or lower triangular:
= 'U':
A
is upper triangular,
= 'L':
A
is lower triangular.
n
INTEGER
. The number of rows and columns of the matrix
A
.
n
0
.
a
DOUBLE PRECISION
.
Array,
DIMENSION
(
lda, *)
.
On entry, the
n
-by-
n
triangular matrix
A
.
lda
INTEGER
. The leading dimension of the array
a
.
lda
max
(1,
n
).
ldsa
INTEGER
. The leading dimension of the array
sa
.
ldsa
max
(1,
n
).
Output Parameters
sa
REAL
.
Array,
DIMENSION
(
ldsa, *)
.
Only the part of
sa
determined by
uplo
is referenced. On exit,
  • if
    info
    = 0, the
    n
    -by-
    n
    triangular matrix
    SA
    ,
  • if
    info
    > 0, the content of the part of
    sa
    determined by
    uplo
    is unspecified.
info
INTEGER
.
=0: successful exit,
> 0: an element of the matrix
A
is greater than the single-precision overflow threshold; in this case, the content of the part of
sa
determined by
uplo
is unspecified on exit.

Product and Performance Information

1

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