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found out about little-documented FFTW_PRESERVE_INPUT which has effect on c2r transforms

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This commit is contained in:
Mark Borgerding
2010-02-16 20:44:48 -05:00
parent 1d342e135c
commit 8f51a4ac90
5 changed files with 208 additions and 100 deletions
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29
unsupported/test/FFT.cpp
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@@ -1,3 +1,5 @@
#if 0
// This file is part of Eigen, a lightweight C++ template library
// for linear algebra. Eigen itself is part of the KDE project.
//
@@ -25,7 +27,11 @@
#include "main.h"
#include <unsupported/Eigen/FFT>
template <typename T>
std::complex<T> RandomCpx() { return std::complex<T>( (T)(rand()/(T)RAND_MAX - .5), (T)(rand()/(T)RAND_MAX - .5) ); }
using namespace std;
using namespace Eigen;
float norm(float x) {return x*x;}
double norm(double x) {return x*x;}
@@ -39,17 +45,16 @@ complex<long double> promote(double x) { return complex<long double>( x); }
complex<long double> promote(long double x) { return complex<long double>( x); }
template <typename VectorType1,typename VectorType2>
long double fft_rmse( const VectorType1 & fftbuf,const VectorType2 & timebuf)
template <typename T1,typename T2>
long double fft_rmse( const vector<T1> & fftbuf,const vector<T2> & timebuf)
{
long double totalpower=0;
long double difpower=0;
cerr <<"idx\ttruth\t\tvalue\t|dif|=\n";
long double pi = acos((long double)-1);
for (int k0=0;k0<fftbuf.size();++k0) {
long double pi = acos((long double)-1 );
for (size_t k0=0;k0<fftbuf.size();++k0) {
complex<long double> acc = 0;
long double phinc = -2.*k0* pi / timebuf.size();
for (int k1=0;k1<timebuf.size();++k1) {
for (size_t k1=0;k1<timebuf.size();++k1) {
acc += promote( timebuf[k1] ) * exp( complex<long double>(0,k1*phinc) );
}
totalpower += norm(acc);
@@ -62,13 +67,13 @@ complex<long double> promote(long double x) { return complex<long double>( x);
return sqrt(difpower/totalpower);
}
template <typename VectorType1,typename VectorType2>
long double dif_rmse( const VectorType1& buf1,const VectorType2& buf2)
template <typename T1,typename T2>
long double dif_rmse( const vector<T1> buf1,const vector<T2> buf2)
{
long double totalpower=0;
long double difpower=0;
int n = min( buf1.size(),buf2.size() );
for (int k=0;k<n;++k) {
size_t n = min( buf1.size(),buf2.size() );
for (size_t k=0;k<n;++k) {
totalpower += (norm( buf1[k] ) + norm(buf2[k]) )/2.;
difpower += norm(buf1[k] - buf2[k]);
}
@@ -234,3 +239,7 @@ void test_FFT()
CALL_SUBTEST( test_scalar<double>(2*3*4*5*7) );
CALL_SUBTEST( test_scalar<long double>(2*3*4*5*7) );
}
#else
#define test_FFTW test_FFT
#include "FFTW.cpp"
#endif