1 files changed, 64 insertions, 0 deletions
diff --git a/erf~/erf~.c b/erf~/erf~.c
new file mode 100644
index 0000000..2f59212
--- /dev/null
+++ b/erf~/erf~.c
@@ -0,0 +1,64 @@
+/* 
+ * 
+ * Error function for pd
+ * Copyright (C) 2006 Tim Blechmann
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "m_pd.h"
+#include "math.h"
+
+static t_class *erf_class;
+
+typedef struct _erf
+{
+    t_object x_obj;
+    float x_f;
+} t_erf;
+
+static void *erf_new(void)
+{
+    t_erf *x = (t_erf *)pd_new(erf_class);
+    outlet_new(&x->x_obj, gensym("signal"));
+    x->x_f = 0;
+    return (x);
+}
+
+static t_int *erf_perform(t_int *w)
+{
+    t_float *in = (t_float *)(w[1]);
+    t_float *out = (t_float *)(w[2]);
+    int n = (int)(w[3]);
+
+    while (n--)
+        *out++ = erff(*in++);
+
+    return w+4;
+}
+
+static void erf_dsp(t_erf *x, t_signal **sp)
+{
+    dsp_add(erf_perform, 3, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
+}
+
+void erf_tilde_setup(void)
+{
+    erf_class = class_new(gensym("erf~"), (t_newmethod)erf_new, 0,
+        sizeof(t_erf), 0, A_DEFFLOAT, 0);
+    CLASS_MAINSIGNALIN(erf_class, t_erf, x_f);
+    class_addmethod(erf_class, (t_method)erf_dsp, gensym("dsp"), 0);
+}