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https://github.com/triqs/dft_tools
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71 lines
2.5 KiB
ReStructuredText
71 lines
2.5 KiB
ReStructuredText
Cookbook
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========
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Basics
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------
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Here, an exemple of creation of a class det_manip, of use of insert and remove.
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.. compileblock::
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#include <triqs/det_manip/det_manip.hpp>
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struct fun {
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typedef double result_type;
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typedef double argument_type;
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//gives the coefficients of the matrix
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double operator()(double x, double y) const {
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return(x-y);
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}
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};
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int main() {
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//creation of the class det_manip
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fun f;
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int init_size=100;
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triqs::det_manip::det_manip<fun> D(f,init_size);
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//the initial matrix is empty:
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std::cout<<std::endl<<"After construction: D.matrix()="<<D.matrix()<<std::endl<<std::endl;
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double detratio;
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//insertion of a line and a column at position (1,1) in the matrix, with x[i]=x, y[j]=y.
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double x=2, y=9;
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int i=0, j=0;
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detratio = D.try_insert(i,j,x,y);
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D.complete_operation();
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std::cout<<"We add a line and a column for i="<<i<<", j="<<j<<", x="<<x<<", y="<<y<<" (f(x,y)="<<f(x,y)<<")."<<std::endl;
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std::cout<<"D.matrix()="<<D.matrix()<<std::endl<<std::endl;
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x=3; y=4; i=0; j=0;
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detratio = D.try_insert(i,j,x,y);
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D.complete_operation();
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std::cout<<"We add a line and a column for i="<<i<<", j="<<j<<", x="<<x<<", y="<<y<<" (f(x,y)="<<f(x,y)<<")."<<std::endl;
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std::cout<<"D.matrix()="<<D.matrix()<<std::endl;
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std::cout<<"The determinant is "<<D.determinant()<<std::endl;
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std::cout<<"The inverse matrix is"<<D.inverse_matrix()<< std::endl<<std::endl;
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x=-7; y=1; i=1; j=2;
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detratio = D.try_insert(i,j,x,y);
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D.complete_operation();
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std::cout<<"We add a line and a column for i="<<i<<", j="<<j<<", x="<<x<<", y="<<y<<" (f(x,y)="<<f(x,y)<<")."<<std::endl;
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std::cout<<"D.matrix()="<<D.matrix()<<std::endl<<std::endl;
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std::cout<<"The size of the matrix is now "<<D.size()<<std::endl;
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std::cout<<"The value of the parameters for coefficient (i,j)=(0,2) is (x,y)=("<<D.get_x(0)<<","<<D.get_y(2)<<") (f("<<D.get_x(0)<<","<<D.get_y(2)<<")="<<f(D.get_x(0),D.get_y(2))<<")."<<std::endl<<std::endl;
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i=0; j=1;
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detratio = D.try_remove(i,j);
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D.complete_operation();
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std::cout<<"We remove a line and a column for i="<<i<<", j="<<j<<"."<<std::endl;
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std::cout<<"D.matrix()="<<D.matrix()<<std::endl;
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std::cout<<"The determinant is "<<D.determinant()<<std::endl;
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std::cout<<"The inverse matrix is"<<D.inverse_matrix()<< std::endl<<std::endl;
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}
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