[Tutor] array and ndarray

[Mr Gerard Kelly]

I am trying to convert something using the old Numeric module to the numpy module.

This is the code so far::

from __future__ import division

import pygame, time, random, pygame.sndarray
sample_rate = 44100

from numpy import *

def sine_array(hz,peak,n_samples=sample_rate):
  length=sample_rate/hz
  omega=pi*2/length
  xvalues=arange(length)*omega
  sinarray=(peak*sin(xvalues).astype(int16))
  sa=resize(sinarray,sample_rate)
  return sa

def play_for(sample_array, ms):
  pygame.mixer.pre_init(sample_rate, -16, 1)
  pygame.init()
  sound = pygame.sndarray.make_sound(sample_array)
  sound.play(-1)
  pygame.time.delay(ms)
  sound.stop()

def main():
  pygame.mixer.pre_init(sample_rate, -16, 1)
  pygame.init()
  play_for(sine_array(440,4096), 4000)

if __name__ == '__main__': main()



My error is the following:

Traceback (most recent call last):
  File "na.py", line 30, in <module>
    if __name__ == '__main__': main()
  File "na.py", line 28, in main
    play_for(sine_array(440,4096), 4000)
  File "na.py", line 20, in play_for
    sound = pygame.sndarray.make_sound(sample_array)
  File "/usr/lib/python2.5/site-packages/pygame/sndarray.py", line 123, in make_sound
    return numericsnd.make_sound (array)
TypeError: argument 1 must be array, not numpy.ndarray


How could I modify this to get an array instead of an ndarray?