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Rework MLPPVector::cross().

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Relintai 2023-12-29 18:36:51 +01:00
parent c793777ffb
commit 6f691f9f26
2 changed files with 15 additions and 9 deletions
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22
mlpp/lin_alg/mlpp_vector.cpp
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@ -851,18 +851,24 @@ real_t MLPPVector::dot(const Ref<MLPPVector> &b) const {
return c; return c;
} }
/* Ref<MLPPVector> MLPPVector::cross(const Ref<MLPPVector> &b) {
std::vector<real_t> MLPPVector::cross(std::vector<real_t> a, std::vector<real_t> b) {
// Cross products exist in R^7 also. Though, I will limit it to R^3 as Wolfram does this. // Cross products exist in R^7 also. Though, I will limit it to R^3 as Wolfram does this.
std::vector<std::vector<real_t>> mat = { onevec(3), a, b }; //std::vector<std::vector<real_t>> mat = { onevec(3), a, b };
real_t det1 = det({ { a[1], a[2] }, { b[1], b[2] } }, 2); real_t det1 = element_get(1) * b->element_get(2) - element_get(2) * b->element_get(1);
real_t det2 = -det({ { a[0], a[2] }, { b[0], b[2] } }, 2); real_t det2 = -(element_get(0) * b->element_get(2) - element_get(2) * b->element_get(0));
real_t det3 = det({ { a[0], a[1] }, { b[0], b[1] } }, 2); real_t det3 = element_get(0) * b->element_get(1) - element_get(1) * b->element_get(0);
return { det1, det2, det3 }; Ref<MLPPVector> ret;
ret.instance();
ret->resize(3);
ret->element_set(0, det1);
ret->element_set(1, det2);
ret->element_set(2, det3);
return ret;
} }
*/
void MLPPVector::abs() { void MLPPVector::abs() {
real_t *out_ptr = ptrw(); real_t *out_ptr = ptrw();

2
mlpp/lin_alg/mlpp_vector.h
View File

@ -195,7 +195,7 @@ public:
real_t dot(const Ref<MLPPVector> &b) const; real_t dot(const Ref<MLPPVector> &b) const;
//std::vector<real_t> cross(std::vector<real_t> a, std::vector<real_t> b); Ref<MLPPVector> cross(const Ref<MLPPVector> &b);
void abs(); void abs();
Ref<MLPPVector> absn() const; Ref<MLPPVector> absn() const;