DftiSetValueDM

Developer Reference for Intel® oneAPI Math Kernel Library for C

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ID 766684

Date 3/31/2023

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DftiSetValueDM

Sets one particular configuration parameter with the specified configuration value.

Syntax

status = DftiSetValueDM (handle, param, value);

Include Files

mkl_cdft.h

Input Parameters

handle: The descriptor handle. Must be valid, that is, created in a call to DftiCreateDescriptorDM.
param: Name of a parameter to be set up in the descriptor handle. See Table "Settable Configuration Parameters" for the list of available parameters.
value: Value of the parameter.

Description

This function sets one particular configuration parameter with the specified configuration value. The configuration parameter is one of the named constants listed in the table below, and the configuration value must have the corresponding type. See Configuration Settings for details of the meaning of each setting and for possible values of the parameters whose values are named constants.

Settable Configuration Parameters
Parameter Name	Data Type	Description	Default Value
`DFTI_FORWARD_SCALE`	Floating-point scalar	Scale factor of forward transform.	1.0
`DFTI_BACKWARD_SCALE`	Floating-point scalar	Scale factor of backward transform.	1.0
`DFTI_PLACEMENT`	Named constant	Placement of the computation result.	`DFTI_INPLACE`
`DFTI_ORDERING`	Named constant	Scrambling of data order.	`DFTI_ORDERED`
`CDFT_WORKSPACE`	Array of an appropriate type	Auxiliary buffer, a user-defined workspace. Enables saving memory during in-place computations.	`NULL` (allocate workspace dynamically).
`DFTI_PACKED_FORMAT`	Named constant	Packed format for storing conjugate-even sequence (in the case of a real forward domain).	`DFTI_PERM_FORMAT` ― default and the only available value for one-dimensional transforms `DFTI_CCE_FORMAT` ― default and the only available value for multi-dimensional transforms
`DFTI_TRANSPOSE`	Named constant	This parameter determines how the output data is located for multi-dimensional transforms. If the parameter value is `DFTI_NONE`, the data is located in a usual manner described in this document. If the value is `DFTI_ALLOW`, the last (first) global transposition is not performed for a forward (backward) transform.	`DFTI_NONE`

Return Values

The function returns DFTI_NO_ERROR when completes successfully. If the function fails, it returns a value of another error class constant (for the list of constants, refer to Error Codes).

Prototype

   
MKL_LONG DftiSetValueDM(DFTI_DESCRIPTOR_DM_HANDLE handle, int param,...);

Parent topic: Cluster FFT Descriptor Configuration Functions

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Developer Reference for Intel® oneAPI Math Kernel Library for C

DftiSetValueDM