update_means()

static void update_means ( POINT4D *  objs, uint32_t *  clusters, uint32_t  n, POINT4D *  centers, uint32_t  k  )

static

Definition at line 149 of file lwkmeans.c.

{
        memset(centers, 0, sizeof(POINT4D) * k);
        /* calculate weighted sum */
        for (uint32_t i = 0; i < n; i++)
        {
                uint32_t cluster = clusters[i];
                centers[cluster].x += objs[i].x * objs[i].m;
                centers[cluster].y += objs[i].y * objs[i].m;
                centers[cluster].z += objs[i].z * objs[i].m;
                centers[cluster].m += objs[i].m;
        }
        /* divide by weight to get average */
        for (uint32_t i = 0; i < k; i++)
        {
                if (centers[i].m)
                {
                        centers[i].x /= centers[i].m;
                        centers[i].y /= centers[i].m;
                        centers[i].z /= centers[i].m;
                }
        }
}

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

Referenced by kmeans().

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