Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

Contents

?_init_trig_transform

Initializes basic data structures of a Trigonometric Transform.

Syntax

void d_init_trig_transform
(
MKL_INT
*n,
MKL_INT
*tt_type,
MKL_INT
ipar[],
double
dpar[],
MKL_INT
*stat
)
;
void s_init_trig_transform
(
MKL_INT
*n,
MKL_INT
*tt_type,
MKL_INT
ipar[],
float
spar[],
MKL_INT
*stat
)
;
Include Files
  • mkl.h
Input Parameters
n
MKL_INT*
. Contains the size of the problem, which should be a positive integer greater than 1. Note that data vector of the transform, which other TT routines will use, must have size
n
+1 for all but staggered2 transforms. Staggered2 transforms require the vector of size
n
.
tt_type
MKL_INT*
. Contains the type of transform to compute, defined via a set of named constants. The following constants are available in the current implementation of TT interface:
MKL_SINE_TRANSFORM, MKL_STAGGERED_SINE_TRANSFORM
,
MKL_STAGGERED2_SINE_TRANSFORM
;
MKL_COSINE_TRANSFORM, MKL_STAGGERED_COSINE_TRANSFORM
,
MKL_STAGGERED2_COSINE_TRANSFORM
.
Output Parameters
ipar
MKL_INT
 array of size 128. Contains integer data needed for Trigonometric Transform computations.
dpar
double
 array of size 5
n
/2+2. Contains double-precision data needed for Trigonometric Transform computations.
spar
float
 array of size 5
n
/2+2. Contains single-precision data needed for Trigonometric Transform computations.
stat
MKL_INT*
. Contains the routine completion status, which is also written to
ipar[6]
. The status should be 0 to proceed to other TT routines.
Description
The
?_init_trig_transform
 routine initializes basic data structures for Trigonometric Transforms of appropriate precision. After a call to
?_init_trig_transform
, all subsequently invoked TT routines use values of
ipar
 and
dpar
 (
spar
) array parameters returned by
?_init_trig_transform
. The routine initializes the entire array
ipar
. In the
dpar
 or
spar
 array,
?_init_trig_transform
 initializes elements that do not depend upon the type of transform. For a detailed description of arrays
ipar
,
dpar
 and
spar
, refer to Common Parameters. You can skip a call to the initialization routine in your code. For more information, see Caveat on Parameter Modifications.
Return Values
stat
= 0
The routine successfully completed the task. In general, to proceed with computations, the routine should complete with this
stat
 value.
stat
= -99999
The routine failed to complete the task.

Product and Performance Information

1

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