Open up dependency on Eigen and FFTW

tests/debug/Test_cheby.cc

@@ -0,0 +1,104 @@
+    /*************************************************************************************
+
+    Grid physics library, www.github.com/paboyle/Grid 
+
+    Source file: ./tests/Test_cheby.cc
+
+    Copyright (C) 2015
+
+Author: Peter Boyle <paboyle@ph.ed.ac.uk>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+    See the full license in the file "LICENSE" in the top level distribution directory
+    *************************************************************************************/
+    /*  END LEGAL */
+#include <Grid/Grid.h>
+
+using namespace std;
+using namespace Grid;
+using namespace Grid::QCD;
+
+RealD InverseApproximation(RealD x){
+  return 1.0/x;
+}
+RealD SqrtApproximation(RealD x){
+  return std::sqrt(x);
+}
+RealD StepFunction(RealD x){
+  if ( x<0.1 )  return 1.0;
+  else return 0.0;
+}
+
+
+int main (int argc, char ** argv)
+{
+  Grid_init(&argc,&argv);
+
+  GridCartesian *grid = SpaceTimeGrid::makeFourDimGrid(GridDefaultLatt(), 
+						       GridDefaultSimd(Nd,vComplex::Nsimd()),
+						       GridDefaultMpi());
+
+  double     lo=0.1;
+  double     hi=64.0;
+
+  Chebyshev<LatticeFermion> ChebyInv(lo,hi,2000,InverseApproximation);
+
+
+  {
+    std::ofstream of("chebyinv");
+    ChebyInv.csv(of);
+  }
+
+  ChebyInv.JacksonSmooth();
+
+  {
+    std::ofstream of("chebyinvjack");
+    ChebyInv.csv(of);
+  }
+
+
+  Chebyshev<LatticeFermion> ChebyStep(lo,hi,200,StepFunction);
+  {
+    std::ofstream of("chebystep");
+    ChebyStep.csv(of);
+  }
+
+
+  ChebyStep.JacksonSmooth();
+
+  {
+    std::ofstream of("chebystepjack");
+    ChebyStep.csv(of);
+  }
+
+  lo=-8;
+  hi=8;
+  Chebyshev<LatticeFermion> ChebyIndefInv(lo,hi,40,InverseApproximation);
+  {
+    std::ofstream of("chebyindefinv");
+    ChebyIndefInv.csv(of);
+  }
+
+  lo=0;
+  hi=64;
+  Chebyshev<LatticeFermion> ChebyNE(lo,hi,40,InverseApproximation);
+  {
+    std::ofstream of("chebyNE");
+    ChebyNE.csv(of);
+  }
+
+  Grid_finalize();
+}