From 5af7081222ef801b23857fb904c78d0798f5d0df Mon Sep 17 00:00:00 2001
From: Hans-Christoph Steiner <eighthave@users.sourceforge.net>
Date: Mon, 10 Jan 2011 06:03:02 +0000
Subject: build Pd's extra as a libdir

svn path=/trunk/; revision=14694
---
 externals/extra/choice/choice.c | 128 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 externals/extra/choice/choice.c

(limited to 'externals/extra/choice/choice.c')

diff --git a/externals/extra/choice/choice.c b/externals/extra/choice/choice.c
new file mode 100644
index 00000000..b7bf23ab
--- /dev/null
+++ b/externals/extra/choice/choice.c
@@ -0,0 +1,128 @@
+/* choice -- match incoming list against a collection of stored templates. */
+
+/*  Copyright 1999 Miller Puckette.
+Permission is granted to use this software for any purpose provided you
+keep this copyright notice intact.
+
+THE AUTHOR AND HIS EMPLOYERS MAKE NO WARRANTY, EXPRESS OR IMPLIED,
+IN CONNECTION WITH THIS SOFTWARE.
+ 
+This file is downloadable from http://www.crca.ucsd.edu/~msp .
+*/
+
+#include "m_pd.h"
+#include <math.h>
+static t_class *choice_class;
+#define DIMENSION 10
+
+typedef struct _elem
+{
+    float e_age;
+    float e_weight[DIMENSION];
+} t_elem;
+
+typedef struct _choice
+{
+    t_object x_obj;
+    t_elem *x_vec;
+    int x_n;
+    int x_nonrepeat;
+} t_choice;
+
+static void *choice_new(t_float fnonrepeat)
+{
+    t_choice *x = (t_choice *)pd_new(choice_class);
+    outlet_new(&x->x_obj, gensym("float"));
+    x->x_vec = (t_elem *)getbytes(0);
+    x->x_n = 0;
+    x->x_nonrepeat = (fnonrepeat != 0);
+    return (x);
+}
+
+static void choice_clear(t_choice *x)
+{
+    x->x_vec = (t_elem *)resizebytes(x->x_vec, x->x_n * sizeof(t_elem), 0);
+    x->x_n = 0;
+}
+
+static void choice_print(t_choice *x)
+{
+    int j;
+    for (j = 0; j < x->x_n; j++)
+    {
+        t_elem *e = x->x_vec + j;
+        t_float *w = e->e_weight;
+        post("%2d age %2d \
+w %5.2f %5.2f %5.2f %5.2f %5.2f %5.2f %5.2f %5.2f %5.2f %5.2f",
+            j, (int)(e->e_age), w[0], w[1], w[2], w[3], w[4], w[5],
+                w[6], w[7], w[8], w[9]);
+    }
+}
+
+static void choice_add(t_choice *x, t_symbol *s, int argc, t_atom *argv)
+{
+    int oldn = x->x_n, newn = oldn + 1, i;
+    t_elem *e;
+    float sum, normal;
+    x->x_vec = (t_elem *)resizebytes(x->x_vec, oldn * sizeof(t_elem),
+        newn * sizeof(t_elem));
+    x->x_n = newn;
+    e = x->x_vec + oldn;
+    e->e_age = 2;
+    
+    for (i = 0, sum = 0; i < DIMENSION; i++)
+    {
+        float f = atom_getfloatarg(i, argc, argv);
+        e->e_weight[i] = f;
+        sum += f*f;
+    }
+    normal = (float)(sum > 0 ? 1./sqrt(sum) : 1);
+    for (i = 0; i < DIMENSION; i++)
+        e->e_weight[i] *= normal;
+}
+
+static void choice_list(t_choice *x, t_symbol *s, int argc, t_atom *argv)
+{
+    int i, j;
+    float bestsum = 0;
+    int bestindex = -1;
+    t_float invec[DIMENSION];
+    for (i = 0; i < DIMENSION; i++)
+        invec[i] = atom_getfloatarg(i, argc, argv);
+    for (j = 0; j < x->x_n; j++)
+    {
+        t_elem *e = x->x_vec + j;
+        float sum;
+        for (i = 0, sum = 0; i < DIMENSION; i++)
+            sum += e->e_weight[i] * invec[i];
+        if (x->x_nonrepeat) sum *= (float)(log(e->e_age));
+        if (sum > bestsum)
+        {
+            bestsum = sum;
+            sum = 1;
+            bestindex = j;
+        }
+    }
+    if (bestindex >= 0)
+    {
+        for (j = 0; j < x->x_n; j++)
+            x->x_vec[j].e_age += 1.;
+        x->x_vec[bestindex].e_age = 1;
+    }
+    outlet_float(x->x_obj.ob_outlet, (float)bestindex);
+}
+
+static void choice_free(t_choice *x)
+{
+    freebytes(x->x_vec, x->x_n * sizeof(t_elem));
+}
+
+void choice_setup(void)
+{
+    choice_class = class_new(gensym("choice"), (t_newmethod)choice_new,
+        (t_method)choice_free, sizeof(t_choice), 0, A_DEFFLOAT, 0);
+    class_addmethod(choice_class, (t_method)choice_add, gensym("add"), A_GIMME, 0);
+    class_addmethod(choice_class, (t_method)choice_clear, gensym("clear"), 0);
+    class_addmethod(choice_class, (t_method)choice_print, gensym("print"), 0);
+    class_addlist(choice_class, choice_list);
+}
-- 
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