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hyperpoint:: det function is now based on the largest coordinate, making it more precise

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Zeno Rogue 2021-04-07 14:46:46 +02:00
parent 7a89ad8b19
commit 42265258f2
1 changed files with 7 additions and 5 deletions
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12
hyperpoint.cpp
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@ -936,12 +936,14 @@ EX ld det(const transmatrix& T) {
ld det = 1; ld det = 1;
transmatrix M = T; transmatrix M = T;
for(int a=0; a<MDIM; a++) { for(int a=0; a<MDIM; a++) {
int max_at = a;
for(int b=a; b<MDIM; b++) for(int b=a; b<MDIM; b++)
if(M[b][a]) { if(abs(M[b][a]) > abs(M[max_at][a]))
if(b != a) max_at = b;
for(int c=a; c<MDIM; c++) tie(M[b][c], M[a][c]) = make_pair(-M[a][c], M[b][c]);
break; if(max_at != a)
} for(int c=a; c<MDIM; c++) tie(M[max_at][c], M[a][c]) = make_pair(-M[a][c], M[max_at][c]);
if(!M[a][a]) return 0; if(!M[a][a]) return 0;
for(int b=a+1; b<MDIM; b++) { for(int b=a+1; b<MDIM; b++) {
ld co = -M[b][a] / M[a][a]; ld co = -M[b][a] / M[a][a];