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/* get the ProbabilityDensityFunction of a signal */
#include "zexy.h"
#ifdef NT
#pragma warning( disable : 4244 )
#pragma warning( disable : 4305 )
#endif
/* ------------------------ pdf~ ----------------------------- */
static t_class *pdf_class;
typedef struct _pdf
{
t_object x_obj;
t_float *buf;
int size;
t_float halfsize;
} t_pdf;
static void clear_pdfbuf(t_pdf *x)
{
int n = x->size;
t_float *buf = x->buf;
while (n--) *buf++=0.;
}
static void pdf_bang(t_pdf *x)
{
int n = x->size;
t_float *buf = x->buf, max = 0;
t_atom a[2];
while (n--) if (max < *buf++) max = buf[-1];
n=x->size;
buf = x->buf;
if (max==0.) max=1.;
max = 1./max;
while (n--)
{
SETFLOAT(a, *buf++*max);
SETFLOAT(a+1,x->size-n-1);
outlet_list(x->x_obj.ob_outlet, &s_list, 2, (t_atom*)&a);
}
}
static void pdf_float(t_pdf *x, t_floatarg f)
{
if (f) pdf_bang(x); else clear_pdfbuf(x);
}
static t_int *pdf_perform(t_int *w)
{
t_float *in = (t_float *)(w[1]);
t_pdf *x = (t_pdf *)(w[2]);
int n = (int)(w[3]);
t_float *buf = x->buf;
t_float halfsize = x->halfsize;
while (n--)
{
t_float f = *in++;
int index = ((f + 1.0) * halfsize)+0.5;
buf[(index<0)?0:((index>=x->size)?x->size-1:index)]+=1.;
}
return (w+4);
}
static void pdf_dsp(t_pdf *x, t_signal **sp)
{
x->halfsize = (x->size - 1) / 2.0;
dsp_add(pdf_perform, 3, sp[0]->s_vec, x, sp[0]->s_n);
}
static void *pdf_new(t_floatarg f)
{
int i = f;
t_pdf *x = (t_pdf *)pd_new(pdf_class);
t_float *buf;
x->size = (i)?i:64;
x->buf = (t_float *)getbytes(x->size * sizeof(t_float));
buf = x->buf;
clear_pdfbuf(x);
outlet_new(&x->x_obj, &s_list);
return (x);
}
static void pdf_free(t_pdf *x)
{
freebytes(x->buf, x->size*sizeof(t_float));
}
static void helper(void)
{
post("\n%c pdf~\t:: get the probability density function of a signal (-1.0 to +1.0)", HEARTSYMBOL);
post("'bang'\t : output a list of the probabilities of 'n' function values"
"\n'clear'\t : clear the buffer (set all probabilities to zero)"
"\n<1/0>\t : short for 'bang' and 'clear'"
"\n'help'\t : view this");
post("creation :: 'pdf~ [<n>]':: get the pdf for <n> (default: 64) values");
}
void z_pdf_setup(void)
{
pdf_class = class_new(gensym("pdf~"), (t_newmethod)pdf_new, (t_method)pdf_free,
sizeof(t_pdf), 0, A_DEFFLOAT, 0);
class_addmethod(pdf_class, nullfn, gensym("signal"), 0);
class_addmethod(pdf_class, (t_method)pdf_dsp, gensym("dsp"), 0);
class_addmethod(pdf_class, (t_method)pdf_bang, gensym("bang"), 0);
class_addmethod(pdf_class, (t_method)clear_pdfbuf, gensym("clear"), 0);
class_addfloat(pdf_class, pdf_float);
class_addmethod(pdf_class, (t_method)helper, gensym("help"), 0);
class_sethelpsymbol(pdf_class, gensym("zexy/pdf~"));
}
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