1 files changed, 45 insertions, 0 deletions
diff --git a/source/vstd.c b/source/vstd.c
new file mode 100644
index 0000000..538cb94
--- /dev/null
+++ b/source/vstd.c
@@ -0,0 +1,45 @@
+#include "defines.h"
+
+/*--------------- vstd ---------------*/
+
+static t_class *vstd_class;
+
+typedef struct _vstd
+{
+    t_object x_obj;
+} t_vstd;
+
+
+static void vstd_perform(t_vstd *x, t_symbol *s, int argc, t_atom *argv)
+{
+	float sumsq=0.0f;
+	float sum=0.0f;
+	int i;
+	for (i = 0; i < argc; i++)
+	{
+		float tmp=atom_getfloat(&argv[i]);
+		sumsq+= tmp*tmp;
+		sum+=tmp;
+	}
+	sumsq/=argc;
+	sum/=argc;
+	outlet_float(x->x_obj.ob_outlet, (float)sqrtf(sumsq-sum*sum));
+}
+
+static void *vstd_new( t_float halfDecayTime)
+{
+	t_vstd *x=(t_vstd *)pd_new(vstd_class);
+	outlet_new(&x->x_obj, gensym("float"));
+	return (void *)x;
+}
+
+void vstd_setup(void)
+{
+    vstd_class = class_new(gensym("vstd"),
+    	(t_newmethod)vstd_new, 0,
+		sizeof(t_vstd), 
+		CLASS_DEFAULT,
+	    0);
+    class_addlist(vstd_class, (t_method)vstd_perform);
+}
+