1 /* delta_plot.c 2011-06-23 */
3 /* Copyright 2010-2011 Emmanuel Paradis
5 /* This file is part of the R-package `ape'. */
6 /* See the file ../COPYING for licensing issues. */
10 void delta_plot(double *D, int *size, int *nbins, int *counts, double *deltabar)
12 int x, y, u, v; /* same notation than in Holland et al. 2002 */
13 int n = *size, nb = *nbins;
14 double dxy, dxu, dxv, dyu, dyv, duv, A, B, C, delta;
15 int xy, xu, xv, yu, yv, uv, i;
17 for (x = 0; x < n - 3; x++) {
18 xy = x*n - x*(x + 1)/2; /* do NOT factorize */
19 for (y = x + 1; y < n - 2; y++, xy++) {
20 yu = y*n - y*(y + 1)/2; /* do NOT factorize */
23 for (u = y + 1; u < n - 1; u++, xu++, yu++) {
24 uv = u*n - u*(u + 1)/2; /* do NOT factorize */
25 dxu = D[xu]; dyu = D[yu];
26 xv = xu + 1; yv = yu + 1;
27 for (v = u + 1; v < n; v++, xv++, yv++, uv++) {
28 dxv = D[xv]; dyv = D[yv]; duv = D[uv];
29 A = dxv + dyu; B = dxu + dyv; C = dxy + duv;
30 if (A == B && B == C) delta = 0; else while (1) {
31 if (C <= B && B <= A) {delta = (A - B)/(A - C); break;}
32 if (B <= C && C <= A) {delta = (A - C)/(A - B); break;}
33 if (A <= C && C <= B) {delta = (B - C)/(B - A); break;}
34 if (C <= A && A <= B) {delta = (B - A)/(B - C); break;}
35 if (A <= B && B <= C) {delta = (C - B)/(C - A); break;}
36 if (B <= A && A <= C) {delta = (C - A)/(C - B); break;}
38 /* if (delta == 1) i = nb - 1; else */