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fixed a bug in inverse caused by precision issues

This commit is contained in:
? 2019-02-25 04:05:56 +01:00 committed by Zeno Rogue
parent bbffc21a95
commit 3b030471b0
1 changed files with 13 additions and 8 deletions
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21
hyperpoint.cpp
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@ -515,13 +515,18 @@ transmatrix inverse(const transmatrix& T) {
transmatrix T2 = Id;
for(int a=0; a<MDIM; a++) {
for(int b=a; b<=DIM; b++)
if(T1[b][a]) {
if(b != a)
for(int c=0; c<MDIM; c++)
swap(T1[b][c], T1[a][c]), swap(T2[b][c], T2[a][c]);
break;
}
int best = a;
for(int b=a+1; b<MDIM; b++)
if(abs(T1[b][a]) > abs(T1[best][a]))
best = b;
int b = best;
if(b != a)
for(int c=0; c<MDIM; c++)
swap(T1[b][c], T1[a][c]), swap(T2[b][c], T2[a][c]);
if(!T1[a][a]) { inverse_error(T); return Id; }
for(int b=a+1; b<=DIM; b++) {
ld co = -T1[b][a] / T1[a][a];
@ -575,7 +580,7 @@ ld circlelength(ld r) {
// distance between two points
double hdist(const hyperpoint& h1, const hyperpoint& h2) {
return hdist0(gpushxto0(h1) * h2);
// return hdist0(gpushxto0(h1) * h2);
ld iv = intval(h1, h2);
switch(cgclass) {
case gcEuclid: