static int nmaster = NMASTER;

static void
setnmaster(const Arg *arg) {
	int n;

	if(arg->i) {
		n = nmaster + arg->i;
		if(n < 1 || wh / n <= 2 * borderpx)
			return;
		nmaster = n;
	}
	else
		nmaster = NMASTER;
	arrange();
}

static Client *
ntilecol(Client* c, uint n, int x, int y, int w, int h) {
	uint i, d;

	for(i = 0; c && i < n; c = nexttiled(c->next), ++i) {
		resize(c, x, y, w - 2 * c->bw, h / (n - i) - 2 * c->bw, True);
		d = c->h + 2 * c->bw;
		y += d;
		h -= d;
	}
	return c;
}

static void
ntile(void) {
	Client *c;
	uint n, mw;

	for(n = 0, c = nexttiled(clients); c; c = nexttiled(c->next), ++n);
	c = nexttiled(clients);
	if(n <= nmaster)
		ntilecol(c, n, wx, wy, ww, wh);
	else {
		mw = mfact * ww;
		ntilecol(ntilecol(c, nmaster, wx, wy, mw, wh), n - nmaster, wx + mw, wy, ww - mw, wh);
	}
}