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authorIOhannes m zmölnig <zmoelnig@users.sourceforge.net>2003-05-24 16:15:53 +0000
committerIOhannes m zmölnig <zmoelnig@users.sourceforge.net>2003-05-24 16:15:53 +0000
commitfb86c4da1890858f5b048ca172dfb0d714e27e10 (patch)
treef7bebcb69d0ced26392a92e869485a1522157a72 /src/ann_som.c
parent21dbdef1fcf5169ade95e05aed35ff361f4d3cc2 (diff)
added "cinit" for centered initialization (preliminary)
svn path=/trunk/externals/ann/; revision=654
Diffstat (limited to 'src/ann_som.c')
-rw-r--r--src/ann_som.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/src/ann_som.c b/src/ann_som.c
index 2bd2b4a..b4a0947 100644
--- a/src/ann_som.c
+++ b/src/ann_som.c
@@ -285,6 +285,54 @@ static void som_init(t_som *x, t_symbol *s, int argc, t_atom *argv)
}
}
+/* centered initialization:
+ * the "first" neuron will be set to all zeros
+ * the "middle" neuron will be set to the given data
+ * the "last" neuron will be set to teh double of the given data
+ */
+static void som_cinit(t_som *x, t_symbol *s, int argc, t_atom *argv){
+ /* initialize the neuron-weights */
+ int i, j;
+ t_float f;
+ t_float v = 1.0f;
+
+ switch (argc) {
+ case 0:
+ case 1:
+ f = (argc)?atom_getfloat(argv):0;
+ for (i=0; i<x->num_neurons; i++){
+ v=i*2.0/x->num_neurons;
+ for (j=0; j<x->num_sensors; j++)
+ x->weights[i][j]=f*v;
+ }
+ break;
+ default:
+ if (argc == x->num_sensors) {
+ for (i=0; i<x->num_neurons; i++){
+ v=i*2.0/x->num_neurons;
+ for (j=0; j<x->num_sensors; j++)
+ x->weights[i][j]=v*atom_getfloat(&argv[j]);
+ }
+ } else
+ error("som_init: you should pass a list of expected mean-values for each sensor to the SOM");
+ }
+}
+
+/* dump the weights of the queried neuron to the output */
+static void som_dump(t_som *x, t_float nf){
+ int n=nf;
+ int i=x->num_sensors;
+ t_atom*ap=0;
+ if (n<0 || n>=x->num_neurons)return;
+ ap=(t_atom*)getbytes(sizeof(t_atom)*x->num_sensors);
+ while(i--)SETFLOAT(&ap[i], x->weights[n][i]);
+ outlet_list(x->x_obj.ob_outlet, &s_list, x->num_sensors, ap);
+
+ freebytes(ap, x->num_sensors*sizeof(t_atom));
+
+
+
+}
static void som_makenewsom(t_som *x, t_symbol *s, int argc, t_atom *argv)
{ /* create a new SOM */
@@ -697,6 +745,7 @@ static void som_setup(void)
class_addmethod(som_class, (t_method)som_makenewsom, gensym("new"), A_GIMME, 0);
class_addmethod(som_class, (t_method)som_init, gensym("init"), A_GIMME, 0);
+ class_addmethod(som_class, (t_method)som_cinit, gensym("cinit"), A_GIMME, 0);
class_addmethod(som_class, (t_method)som_learn, gensym("learn"), A_GIMME, 0);
class_addmethod(som_class, (t_method)som_neighbour, gensym("neighbour"), A_GIMME, 0);