init_guess()

static POINT3D init_guess ( const POINT4D *  points, uint32_t  npoints  )

static

Definition at line 152 of file lwgeom_median.c.

{
        assert(npoints > 0);
        POINT3D guess = { 0, 0, 0 };
        double mass = 0;
        uint32_t i;
        for (i = 0; i < npoints; i++)
        {
                guess.x += points[i].x * points[i].m;
                guess.y += points[i].y * points[i].m;
                guess.z += points[i].z * points[i].m;
                mass += points[i].m;
        }
        guess.x /= mass;
        guess.y /= mass;
        guess.z /= mass;
        return guess;
}

References POINT4D::m, POINT3D::x, POINT4D::x, POINT3D::y, POINT4D::y, POINT3D::z, and POINT4D::z.

Referenced by lwmpoint_median().

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