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lanczos.cpp
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133 lines (109 loc) · 3.63 KB
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//
// lanczos.cpp
// SPT
//
// Created by Bin Xu on 9/6/14.
// Copyright (c) 2014 Bin Xu. All rights reserved.
//
#include "lanczos.h"
#include <iostream>
using namespace std;
void lanczos_diag(int dim, int nevec, void (*matvec) (int*, double*, double*, bool*), vector<double>& eigenvalues, vector<double>& variance, vector<rs_eigenvector>& eigenvectors, int maxstep, int report, int seed)
{
double *eval = new double[nevec];
double *vari = new double[nevec];
int *number = nullptr;
double *reso = new double;
double *evec = new double[nevec * dim];
lanczos_diag_rs_(&dim, &nevec, matvec, eval, evec, vari, number, reso, &maxstep, &report, &seed);
eigenvalues.resize(nevec);
eigenvectors.resize(nevec);
variance.resize(nevec);
int k = 0;
for (int i = 0; i < nevec; i++)
{
eigenvalues[i] = eval[i];
variance[i] = vari[i];
eigenvectors[i].eigenvector.resize(dim);
for(int j = 0; j < dim; j++)
{
eigenvectors[i].eigenvector[j] = evec[k];
k++;
}
eigenvectors[i].eigenvalue = eval[i];
}
delete [] eval;
delete [] vari;
delete reso;
delete [] evec;
}
void lanczos_diag(int dim, int nevec, void (*matvec) (int*, double*, double*, bool*), vector<double>& eigenvalues, vector<double>& variance, int maxstep, int report, int seed)
{
double *eval = new double[nevec];
double *vari = new double[nevec];
int *number = nullptr;
double *reso = new double;
double *evec = new double[nevec * dim];
lanczos_diag_rs_(&dim, &nevec, matvec, eval, evec, vari, number, reso, &maxstep, &report, &seed);
eigenvalues.resize(nevec);
variance.resize(nevec);
for (int i = 0; i < nevec; i++)
{
eigenvalues[i] = eval[i];
variance[i] = vari[i];
}
delete [] eval;
delete [] vari;
delete reso;
delete [] evec;
}
void lanczos_diag(int dim, int nevec, void (*matvec) (int*, complex<double> *, complex<double> *, bool*), vector<double>& eigenvalues, vector<double>& variance, vector<ch_eigenvector>& eigenvectors, int maxstep, int report, int seed)
{
double *eval = new double[nevec];
double *vari = new double[nevec];
int *number = nullptr;
double *reso = new double;
complex<double> *evec = new complex<double> [nevec * dim];
lanczos_diag_ch_(&dim, &nevec, matvec, eval, evec, vari, number, reso, &maxstep, &report, &seed);
cout<<nevec<<endl;
eigenvalues.resize(nevec);
eigenvectors.resize(nevec);
variance.resize(nevec);
int k = 0;
for (int i = 0; i < nevec; i++)
{
eigenvalues[i] = eval[i];
variance[i] = vari[i];
eigenvectors[i].eigenvector.resize(dim);
for(int j = 0; j < dim; j++)
{
eigenvectors[i].eigenvector[j] = evec[k];
k++;
}
eigenvectors[i].eigenvalue = eval[i];
}
delete [] eval;
delete [] vari;
delete reso;
delete [] evec;
}
void lanczos_diag(int dim, int nevec, void (*matvec) (int*, complex<double> *, complex<double> *, bool*), vector<double>& eigenvalues, vector<double>& variance, int maxstep, int report, int seed)
{
double *eval = new double[nevec];
double *vari = new double[nevec];
int *number = nullptr;
double *reso = new double;
complex<double> *evec = new complex<double> [nevec * dim];
lanczos_diag_ch_(&dim, &nevec, matvec, eval, evec, vari, number, reso, &maxstep, &report, &seed);
eigenvalues.resize(nevec);
variance.resize(nevec);
for (int i = 0; i < nevec; i++)
{
eigenvalues[i] = eval[i];
variance[i] = vari[i];
}
delete [] eval;
delete [] vari;
delete reso;
delete [] evec;
}