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det_manip: try_insert_from_function(i,j,fx,fy,ksi)

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Laura Messio 2013-08-27 13:50:30 +02:00 committed by Olivier Parcollet
parent 6239dee8b3
commit a39e41e9fd
1 changed files with 28 additions and 1 deletions
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29
triqs/det_manip/det_manip.hpp
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@ -324,7 +324,34 @@ namespace triqs { namespace det_manip {
w1.ksi = f(x,y) - arrays::dot( w1.C(R) , w1.MB(R) );
newdet = det*w1.ksi;
newsign = ((i + j)%2==0 ? sign : -sign); // since N-i0 + N-j0 = i0+j0 [2]
return (newdet/det)*(newsign*sign); // sign is unity, hence 1/sign == sign
return w1.ksi*(newsign*sign); // sign is unity, hence 1/sign == sign
}
//fx gives the new line coefficients, fy gives the new column coefficients and ksi is the last coeff (at the intersection of the line and the column).
template<typename Fx, typename Fy>
value_type try_insert_from_function(size_t i, size_t j, Fx fx, Fy fy, value_type const ksi) {
// check input and store it for complete_operation
assert(i<=N); assert(j<=N); assert(i>=0); assert(j>=0);
if (N==Nmax) reserve(2*Nmax);
last_try = 1;
w1.i=i; w1.j=j;
// treat empty matrix separately
if (N==0) { newdet = ksi; newsign = 1; return newdet; }
// I add the row and col and the end. If the move is rejected,
// no effect since N will not be changed : Minv(i,j) for i,j>=N has no meaning.
for (size_t k= 0; k< N; k++) {
w1.B(k) = fx(x_values[k]);
w1.C(k) = fy(y_values[k]);
}
range R(0,N);
w1.MB(R) = mat_inv(R,R) * w1.B(R);// CHANGE
w1.ksi = ksi - arrays::dot( w1.C(R) , w1.MB(R) );
newdet = det*w1.ksi;
newsign = ((i + j)%2==0 ? sign : -sign); // since N-i0 + N-j0 = i0+j0 [2]
return w1.ksi*(newsign*sign); // sign is unity, hence 1/sign == sign
}
//------------------------------------------------------------------------------------------