Hi again, sorry that I first misunderstood your problem. Maybe it helps to split the simplification into several simplify_indexed() calls, or is this not equivalent in your case? Ulrich. Nachricht von Sonntag 15 Mai 2011 22:38:07:
I've been trying to get a little program of mine to work and well it just doesn't terminate. Somewhere it gets snagged in an infinite loop in the library. I'm pretty sure this is a library bug and I've alerted development but in the mean while has an one encountered this before? Has any one figured out a work around? I've whittled my program down to the smallest most simple component I could get to non terminate. The code looks like this.
#include <iostream> #include <ginac/ginac.h> using namespace std; using namespace GiNaC;
int main() { symbol i_sym("i"), j_sym("j"), k_sym("k"), l_sym("l"), m_sym("m"), n_sym("n"); idx i(i_sym, 2), j(j_sym, 2), k(k_sym, 2), l(l_sym, 2), m(m_sym, 2), n(n_sym, 2);
symbol alpha_sym("\\alpha"), beta_sym("\\beta"), gamma_sym("\\gamma"); idx Va(alpha_sym, 3), Vb(beta_sym, 3), Vg(gamma_sym, 3);
symbol U("U"), v("v"), h("h");
exvector IJKLMNVec; idx IJKLMNIA[] ={i, j, k, l, m, n}; IJKLMNVec.assign (IJKLMNIA,IJKLMNIA+6);
ex myEx = (indexed(h, IJKLMNVec)*indexed(U, i, Va) *indexed(U, k, Vb)*indexed(U, m, Vg)*indexed(v, j, Va) *indexed(v, l, Vb)*indexed(v, n, Vg)).simplify_indexed();
cout << myEx << endl;
return 0; }
This code never makes it to the cout code. it get trapped in a loop before then. Any one seen this before?
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