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Approx tests and lanczos improvement

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paboyle
2017-10-13 11:30:50 +01:00
parent 9fe6ac71ea
commit cb9ff20249
9 changed files with 823 additions and 712 deletions
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61
tests/hmc/Test_remez.cc
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@ -38,11 +38,11 @@ int main (int argc, char ** argv)
std::cout<<GridLogMessage << "Testing Remez"<<std::endl;
double lo=0.01;
double hi=1.0;
double lo=1.0e-3;
double hi=5.0;
int precision=64;
int degree=10;
AlgRemez remez(0.001,1.0,precision);
int degree=16;
AlgRemez remez(lo,hi,precision);
////////////////////////////////////////
// sqrt and inverse sqrt
@ -50,21 +50,50 @@ int main (int argc, char ** argv)
std::cout<<GridLogMessage << "Generating degree "<<degree<<" for x^(1/2)"<<std::endl;
remez.generateApprox(degree,1,2);
MultiShiftFunction Sqrt(remez,1.0,false);
MultiShiftFunction InvSqrt(remez,1.0,true);
MultiShiftFunction Root2(remez,1.0,false);
MultiShiftFunction InvRoot2(remez,1.0,true);
std::cout<<GridLogMessage << "Generating degree "<<degree<<" for x^(1/4)"<<std::endl;
remez.generateApprox(degree,1,4);
MultiShiftFunction SqrtSqrt(remez,1.0,false);
MultiShiftFunction InvSqrtSqrt(remez,1.0,true);
MultiShiftFunction Root4(remez,1.0,false);
MultiShiftFunction InvRoot4(remez,1.0,true);
std::cout<<GridLogMessage << "Generating degree "<<degree<<" for x^(1/8)"<<std::endl;
remez.generateApprox(degree,1,8);
MultiShiftFunction Root8(remez,1.0,false);
MultiShiftFunction InvRoot8(remez,1.0,true);
std::cout<<GridLogMessage << "Generating degree "<<degree<<" for x^(1/16)"<<std::endl;
remez.generateApprox(degree,1,16);
MultiShiftFunction Root16(remez,1.0,false);
MultiShiftFunction InvRoot16(remez,1.0,true);
std::cout<<GridLogMessage << "Generating degree "<<degree<<" for x^(1/32)"<<std::endl;
remez.generateApprox(degree,1,32);
MultiShiftFunction Root32(remez,1.0,false);
MultiShiftFunction InvRoot32(remez,1.0,true);
ofstream gnuplot(std::string("Sqrt.gnu"),std::ios::out|std::ios::trunc);
Sqrt.gnuplot(gnuplot);
ofstream gnuplot(std::string("Root2.gnu"),std::ios::out|std::ios::trunc);
Root2.gnuplot(gnuplot);
ofstream gnuplot_i2(std::string("InvRoot2.gnu"),std::ios::out|std::ios::trunc);
InvRoot2.gnuplot(gnuplot_i2);
ofstream gnuplot_i4(std::string("InvRoot4.gnu"),std::ios::out|std::ios::trunc);
InvRoot4.gnuplot(gnuplot_i4);
ofstream gnuplot_i8(std::string("InvRoot8.gnu"),std::ios::out|std::ios::trunc);
InvRoot8.gnuplot(gnuplot_i8);
ofstream gnuplot_i16(std::string("InvRoot16.gnu"),std::ios::out|std::ios::trunc);
InvRoot16.gnuplot(gnuplot_i16);
ofstream gnuplot_i32(std::string("InvRoot32.gnu"),std::ios::out|std::ios::trunc);
InvRoot32.gnuplot(gnuplot_i32);
ofstream gnuplot_inv(std::string("InvSqrt.gnu"),std::ios::out|std::ios::trunc);
InvSqrt.gnuplot(gnuplot);
double x=0.6789;
double sx=std::sqrt(x);
@ -72,10 +101,10 @@ int main (int argc, char ** argv)
double isx=1.0/sx;
double issx=1.0/ssx;
double asx =Sqrt.approx(x);
double assx =SqrtSqrt.approx(x);
double aisx =InvSqrt.approx(x);
double aissx=InvSqrtSqrt.approx(x);
double asx =Root2.approx(x);
double assx =Root4.approx(x);
double aisx =InvRoot2.approx(x);
double aissx=InvRoot4.approx(x);
std::cout<<GridLogMessage << "x^(1/2) : "<<sx<<" "<<asx<<std::endl;
std::cout<<GridLogMessage << "x^(1/4) : "<<ssx<<" "<<assx<<std::endl;