Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

  • 0.10
  • 10/21/2020
  • Public Content
Contents

?tfttr

Copies a triangular matrix from the rectangular full packed format (TF) to the standard full format (TR) .

Syntax

lapack_int
LAPACKE_stfttr
(
int
matrix_layout
,
char
transr
,
char
uplo
,
lapack_int
n
,
const
float
*
arf
,
float
*
a
,
lapack_int
lda
);
lapack_int
LAPACKE_dtfttr
(
int
matrix_layout
,
char
transr
,
char
uplo
,
lapack_int
n
,
const
double
*
arf
,
double
*
a
,
lapack_int
lda
);
lapack_int
LAPACKE_ctfttr
(
int
matrix_layout
,
char
transr
,
char
uplo
,
lapack_int
n
,
const
lapack_complex_float
*
arf
,
lapack_complex_float
*
a
,
lapack_int
lda
);
lapack_int
LAPACKE_ztfttr
(
int
matrix_layout
,
char
transr
,
char
uplo
,
lapack_int
n
,
const
lapack_complex_double
*
arf
,
lapack_complex_double
*
a
,
lapack_int
lda
);
Include Files
  • mkl.h
Description
The routine copies a triangular matrix
A
 from the Rectangular Full Packed (RFP) format to the standard full format. For the description of the RFP format, see Matrix Storage Schemes.
Input Parameters
matrix_layout
Specifies whether matrix storage layout is row major (
LAPACK_ROW_MAJOR
) or column major (
LAPACK_COL_MAJOR
 ).
transr
= 'N':
arf
 is in the Normal format,
= 'T':
arf
 is in the Transpose format (for
stfttr
 and
dtfttr
),
= 'C':
arf
 is in the Conjugate-transpose format (for
ctfttr
 and
ztfttr
).
uplo
Specifies whether
A
 is upper or lower triangular:
= 'U': A is upper triangular,
= 'L': A is lower triangular.
n
The order of the matrices
arf
 and
a
.
n
≥
 0
.
arf
Array, size at least
max
(1,
n
*(
n
+1)/2).
On entry, the upper or lower triangular matrix
A
 stored in the RFP format.
lda
The leading dimension of the array
a.
lda
≥
max
(1,
n
).
Output Parameters
a
Array, size
max(1,
lda
*
n
)
.
On exit, the triangular matrix
A
. If
uplo
 = 'U', the leading
n
-by-
n
 upper triangular part of the array
a
 contains the upper triangular matrix, and the strictly lower triangular part of
a
 is not referenced. If
uplo
 = 'L', the leading
n
-by-
n
 lower triangular part of the array
a
 contains the lower triangular matrix, and the strictly upper triangular part of
a
 is not referenced.
Return Values
This function returns a value
info
.
If
info
 = 0
, the execution is successful.
If
info
 < 0
, the
i
-th parameter had an illegal value.
If
info
 = -1011
, memory allocation error occurred.

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