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Diffstat (limited to 'externals/grill/vasp/mixfft.txt')
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1 files changed, 0 insertions, 85 deletions
diff --git a/externals/grill/vasp/mixfft.txt b/externals/grill/vasp/mixfft.txt deleted file mode 100644 index 03262e52..00000000 --- a/externals/grill/vasp/mixfft.txt +++ /dev/null @@ -1,85 +0,0 @@ - - Arbitrary Length FFT - ------------------------------------------------------------------------ - NOTE : This is copyrighted material, NOT public domain. See below. - ------------------------------------------------------------------------ - Contents: - This packet contains the C source for a mixed-radix FFT routine. - It performs a fast discrete Fourier transform (FFT) of a complex - sequence, x, of an arbitrary length, n. The output, y, is also a - complex sequence of length n. - - y[k] = sum(x[m]*exp(-i*2*pi*k*m/n), m=0..(n-1)), k=0,...,(n-1) - - The largest prime factor of n must be less than or equal to the - constant, maxPrimeFactor defined in mixfft.c. The input/output - variables are each stored in two arrays comprising the real part - and the imaginary part respectively. - - The routine is accompanied by a demo program, fftbench.c, that - demonstrates the numerical capabilities. It measures the execution - time as well. If you wish to test the capabilities of another FFT - routine, the fftbench.c is easy to modify. - ------------------------------------------------------------------------ - Filelist: - mixfft.c 21.120 001030 The C source for the mixed-radix FFT. - fftbench.c 8.724 001030 The C source for FFT benchmark program. - fftbench.exe 62.976 001030 The PC executable. - readme.txt This file. - ------------------------------------------------------------------------ - Platforms: - - PC: - The included fftbench.exe was generated using the Microsoft Visual - C++ compiler with the following compile options: - /nologo /Gs /G2 /W4 /AH /Ox /D "NDEBUG" /D "_DOS" /FR - It was tested on a 50MHz 486DX. Please refer to fftbench.c for some - benchmarks. (jjn, March 1996) - - Other: - Your experience with other platforms are warmly welcomed. Please - e-mail me. - ------------------------------------------------------------------------ - Conditions: - The source code in this packet is copyrighted material. - - Non-commercial use of the source code is free. - - A $100 fee must be paid if used commercially. Please contact me at - jjn@get2net.dk and register your copy. The $100 fee includes - up to one hour of assistance related to your use of the code. A - trial period of 14 days is allowed. - - If the code is used for professional (paid) research and development - for non-profit organisations like universities a reduced fee of $20 - must be paid. - - The commercial license allows you to include the compiled code in a - product or to use the code on a regular basis. You are however NOT - allowed to sell the source code. - - Distribution of the complete unaltered package, including this - file, is free. This includes commercial CD's. - ------------------------------------------------------------------------ - Author: - Jens Joergen Nielsen For non-commercial use only. - Bakkehusene 54 A $100 fee must be paid if used - 2970 Hoersholm commercially. Please contact. - DENMARK - - mailto:jjn@get2net.dk All rights reserved. October 2000. - - Check my homepage for updates and FAQ's http://home.get2net.dk/jjn - ------------------------------------------------------------------------ - Release notes: - V.0.1 950301 Initial MIXFFT release. - V.0.3 960317 Input/output variables have separate arrays for - real and imag part. The speed of prime factors - larger than 7 is more than doubled. - V.0.4 980103 e-mail address changed. - V.0.5 001030 Memory allocation in FFTBench changed, now calloc - is used. Error reporting when primefactor is - larger than maxPrimeFactor has been corrected. - - - ------------------------------------------------------------------------ |