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# py/pyext - python script objects for PD and MaxMSP
#
# Copyright (c) 2002-2005 Thomas Grill (gr@grrrr.org)
# For information on usage and redistribution, and for a DISCLAIMER OF ALL
# WARRANTIES, see the file, "license.txt," in this distribution.
#
"""This is an example script for the py/pyext object's buffer support.
PD/Max buffers can be mapped to numarray arrays.
For numarray see http://numeric.scipy.org
It will probably once be replaced by Numeric(3)
"""
import sys
try:
import pyext
except:
print "ERROR: This script must be loaded by the PD/Max py/pyext external"
try:
from numarray import *
except:
print "Failed importing numarray module:",sys.exc_value
def mul(*args):
# create buffer objects
# as long as these variables live the underlying buffers are locked
c = pyext.Buffer(args[0])
a = pyext.Buffer(args[1])
b = pyext.Buffer(args[2])
# slicing causes numarrays (mapped to buffers) to be created
# note the c[:] - to assign contents you must assign to a slice of the buffer
c[:] = a[:]*b[:]
def add(*args):
c = pyext.Buffer(args[0])
a = pyext.Buffer(args[1])
b = pyext.Buffer(args[2])
# this is also possible, but is probably slower
# the + converts a into a numarray, the argument b is taken as a sequence
# depending on the implementation in numarray this may be as fast
# as above or not
c[:] = a+b
def fadein(target):
a = pyext.Buffer(target)
# in place operations are ok
a *= arange(len(a),type=Float32)/len(a)
def neg(target):
a = pyext.Buffer(target)
# in place transformation (see numarray ufuncs)
negative(a[:],a[:])
# must mark buffer content as dirty to update graph
# (no explicit assignment occurred)
a.dirty()
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