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demo_filterbank.py: use fvec to create array

--- a/interfaces/python/demo_filterbank.py

+++ b/interfaces/python/demo_filterbank.py

@@ -1,10 +1,9 @@

-from _aubio import filterbank

-from numpy import array

+from aubio import filterbank, fvec

 f = filterbank(9, 1024)

-freq_list = [40, 80, 200, 400, 800, 1600, 3200, 6400, 12800, 15000, 24000]

-freqs = array(freq_list, dtype = 'float32')

-f.set_triangle_bands(freqs, 48000)

+freq_list = [60, 80, 200, 400, 800, 1600, 3200, 6400, 12800, 15000, 24000]

+freqs = fvec(freq_list)

+f.set_triangle_bands(freq_list, 48000)

 f.get_coeffs().T

 from pylab import loglog, show