Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

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

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