Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

Contents

?trttp

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

Syntax

lapack_int
LAPACKE_strttp
(
int
matrix_layout
,
char
uplo
,
lapack_int
n
,
const
float
*
a
,
lapack_int
lda
,
float
*
ap
);
lapack_int
LAPACKE_dtrttp
(
int
matrix_layout
,
char
uplo
,
lapack_int
n
,
const
double
*
a
,
lapack_int
lda
,
double
*
ap
);
lapack_int
LAPACKE_ctrttp
(
int
matrix_layout
,
char
uplo
,
lapack_int
n
,
const
lapack_complex_float
*
a
,
lapack_int
lda
,
lapack_complex_float
*
ap
);
lapack_int
LAPACKE_ztrttp
(
int
matrix_layout
,
char
uplo
,
lapack_int
n
,
const
lapack_complex_double
*
a
,
lapack_int
lda
,
lapack_complex_double
*
ap
);
Include Files
  • mkl.h
Description
The routine copies a triangular matrix
A
 from the standard full format to the standard packed format.
Input Parameters
uplo
Specifies whether
A
 is upper or lower triangular:
= 'U': A is upper triangular,
= 'L': A is lower triangular.
n
The order of the matrix
A
,
n
≥
 0.
a
Array, size
max(1,
lda
*
n
)
.
On entry, 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.
lda
The leading dimension of the array
a.
lda
≥
max
(1,
n
).
Output Parameters
ap
Array, size at least
max
(1,
n
*(
n
+1)/2).
On exit, the upper or lower triangular matrix
A
, packed columnwise in a linear array. (see Matrix Storage Schemes)
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.