Trigonometric Transform Implementation Details

Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

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ID 766686

Date 4/28/2026

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Trigonometric Transform Implementation Details

Several aspects of the Intel® oneAPI Math Kernel Library (oneMKL) TT interface are platform-specific and language-specific. To promote portability across platforms and ease of use across different languages, Intel® oneAPI Math Kernel Library (oneMKL) provides you with the TT language-specific header file to include in your code:

mkl_trig_transforms.f90, to be used together with mkl_dfti.f90.

NOTE:

Use of the Intel® oneAPI Math Kernel Library (oneMKL) TT software without including the above language-specific header files is not supported.

Intel® oneAPI Math Kernel Library (oneMKL) TT interface supports Fortran versions starting with Fortran 90.

Header File

The header file defines the following function prototypes:

SUBROUTINE D_INIT_TRIG_TRANSFORM(n, tt_type, ipar, dpar, stat)
    INTEGER, INTENT(IN) :: n, tt_type
    INTEGER, INTENT(INOUT) :: ipar(*)
    REAL(8), INTENT(INOUT) :: dpar(*)
    INTEGER, INTENT(OUT) :: stat
END SUBROUTINE D_INIT_TRIG_TRANSFORM

SUBROUTINE D_COMMIT_TRIG_TRANSFORM(f, handle, ipar, dpar, stat)
    REAL(8), INTENT(INOUT) :: f(*)
    TYPE(DFTI_DESCRIPTOR), POINTER :: handle
    INTEGER, INTENT(INOUT) :: ipar(*)
    REAL(8), INTENT(INOUT) :: dpar(*)
    INTEGER, INTENT(OUT) :: stat
END SUBROUTINE D_COMMIT_TRIG_TRANSFORM

SUBROUTINE D_FORWARD_TRIG_TRANSFORM(f, handle, ipar, dpar, stat)
    REAL(8), INTENT(INOUT) :: f(*)
    TYPE(DFTI_DESCRIPTOR), POINTER :: handle
    INTEGER, INTENT(INOUT) :: ipar(*)
    REAL(8), INTENT(INOUT) :: dpar(*)
    INTEGER, INTENT(OUT) :: stat
END SUBROUTINE D_FORWARD_TRIG_TRANSFORM

SUBROUTINE D_BACKWARD_TRIG_TRANSFORM(f, handle, ipar, dpar, stat)
    REAL(8), INTENT(INOUT) :: f(*)
    TYPE(DFTI_DESCRIPTOR), POINTER :: handle
    INTEGER, INTENT(INOUT) :: ipar(*)
    REAL(8), INTENT(INOUT) :: dpar(*)
    INTEGER, INTENT(OUT) :: stat
END SUBROUTINE D_BACKWARD_TRIG_TRANSFORM

SUBROUTINE S_INIT_TRIG_TRANSFORM(n, tt_type, ipar, spar, stat)
    INTEGER, INTENT(IN) :: n, tt_type
    INTEGER, INTENT(INOUT) :: ipar(*)
    REAL(4), INTENT(INOUT) :: spar(*)
    INTEGER, INTENT(OUT) :: stat
END SUBROUTINE S_INIT_TRIG_TRANSFORM

SUBROUTINE S_COMMIT_TRIG_TRANSFORM(f, handle, ipar, spar, stat)
    REAL(4), INTENT(INOUT) :: f(*)
    TYPE(DFTI_DESCRIPTOR), POINTER :: handle
    INTEGER, INTENT(INOUT) :: ipar(*)
    REAL(4), INTENT(INOUT) :: spar(*)
    INTEGER, INTENT(OUT) :: stat
END SUBROUTINE S_COMMIT_TRIG_TRANSFORM

SUBROUTINE S_FORWARD_TRIG_TRANSFORM(f, handle, ipar, spar, stat)
    REAL(4), INTENT(INOUT) :: f(*)
    TYPE(DFTI_DESCRIPTOR), POINTER :: handle
    INTEGER, INTENT(INOUT) :: ipar(*)
    REAL(4), INTENT(INOUT) :: spar(*)
    INTEGER, INTENT(OUT) :: stat
END SUBROUTINE S_FORWARD_TRIG_TRANSFORM

SUBROUTINE S_BACKWARD_TRIG_TRANSFORM(f, handle, ipar, spar, stat)
    REAL(4), INTENT(INOUT) :: f(*)
    TYPE(DFTI_DESCRIPTOR), POINTER :: handle
    INTEGER, INTENT(INOUT) :: ipar(*)
    REAL(4), INTENT(INOUT) :: spar(*)
    INTEGER, INTENT(OUT) :: stat
END SUBROUTINE S_BACKWARD_TRIG_TRANSFORM

SUBROUTINE FREE_TRIG_TRANSFORM(handle, ipar, stat)
    INTEGER, INTENT(INOUT) :: ipar(*)
    TYPE(DFTI_DESCRIPTOR), POINTER :: handle
    INTEGER, INTENT(OUT) :: stat
END SUBROUTINE FREE_TRIG_TRANSFORM

Fortran specifics of the TT routines usage are similar for all Intel® oneAPI Math Kernel Library (oneMKL) PDE support tools and described in Calling PDE Support Routines from Fortran.

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Trigonometric Transform Implementation Details

Header File