linear_algebra.cpp

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#include <linear_algebra.h>

#include <cmath>            // sqrt

double dist(Point3D& p1, Point3D& p2) {
    return norm((p1-p2)*(p1-p2));
}

double norm2(const Point3D& p) {
    return (p.x*p.x+p.y*p.y+p.z*p.z);
}

double norm(const Point3D& p) {
    return sqrt(norm2(p));
}