https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/issue-with-output-of-fft/m-p/929882#M13662 <P>Hi,</P> <P>i'm evaluating fft function.</P> <P>my packed format is CCS.</P> <P>i'm giving real input to fft function and i'm getting complex output arranged in real aaray in R,I,R,I format.</P> <P>since it's real fft so due to conjugate symmetry i 'm getting half output.</P> <P>how to retrive other half of output.</P> Fri, 19 Oct 2012 08:57:13 GMT rakesh 2012-10-19T08:57:13Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/issue-with-output-of-fft/m-p/929882#M13662 <P>Hi,</P> <P>i'm evaluating fft function.</P> <P>my packed format is CCS.</P> <P>i'm giving real input to fft function and i'm getting complex output arranged in real aaray in R,I,R,I format.</P> <P>since it's real fft so due to conjugate symmetry i 'm getting half output.</P> <P>how to retrive other half of output.</P> Fri, 19 Oct 2012 08:57:13 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/issue-with-output-of-fft/m-p/929882#M13662 rakesh 2012-10-19T08:57:13Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/issue-with-output-of-fft/m-p/929883#M13663 Dear rakesh, does you mean Real FFT ouput z(n/2) CCS R0 0 R1 I1 ... Rn/2-1 In/2-1 Rn/2 0 and you want to restore another half R0 0 R1 -I1 ... Rn/2-1 -In/2-1 Rn/2 0 you may use the funciton v?Conj to Performs element by element conjugation of the vector and attach another half to your original output array. like call vcconj( n/2, z(0), z(n/2+1) ) Best Regards, Ying Mon, 22 Oct 2012 08:23:17 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/issue-with-output-of-fft/m-p/929883#M13663 Ying_H_Intel 2012-10-22T08:23:17Z