topic newbi - how to use DftiComputeForward in Intel® oneAPI Math Kernel Library

newbi - how to use DftiComputeForward

Erich_Zwyssig — Thu, 03 Jun 2010 16:17:03 GMT

Hija all

status = DftiComputeForward( desc_handle, x_in, y_out );

Can anybody tell me how I can find out what x_in and y_out are?

Thanks for your help

Erich

newbi - how to use DftiComputeForward

Gennady_F_Intel — Thu, 03 Jun 2010 19:02:29 GMT

Hi Erich,

first of all, please look at the examples MKL DFTI examples. you can find them in \examples\dftc\source\ directory.

--Gennady

newbi - how to use DftiComputeForward

barragan_villanueva_ — Fri, 04 Jun 2010 06:37:04 GMT

Hi Erich,

For out-of-place transforms x_in is for input data and y_out for output.
But for in-place transforms the only data pointer is for input and output.
Also, in case of split-complex data there should be used two separated pointers: for real and imagimary parts. Please take a look at MKL User Guide for more details.

newbi - how to use DftiComputeForward

barragan_villanueva_ — Fri, 04 Jun 2010 08:44:40 GMT

Sorry, here is fragment from MKL Reference Manual (not User Guide as I mentioned before):

ComputeForward

Computes the forward FFT.

Syntax

Fortran:

status = DftiComputeForward( desc_handle, x_inout )

status = DftiComputeForward( desc_handle, x_in, y_out )

status = DftiComputeForward( desc_handle, xre_inout, xim_inout )

status = DftiComputeForward( desc_handle, xre_in, xim_in, yre_out, yim_out )

status = DftiComputeForward( desc_handle, x_inout );

status = DftiComputeForward( desc_handle, x_in, y_out );

status = DftiComputeForward( desc_handle, xre_inout, xim_inout );

status = DftiComputeForward( desc_handle, xre_in, xim_in, yre_out, yim_out );

newbi - how to use DftiComputeForward

Erich_Zwyssig — Fri, 04 Jun 2010 10:16:30 GMT

Hi Gennady, (all)

Thanks for your great help and pointing me to the examples directory. I should be able to sort it out now.

Erich