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def sqwave(f, N=10):
"Erstellt Rechteckfunktion mit Frequenz f, N mal"
f = float(f)
f_sample = 200*f
print "Samplingfrequenz:", f_sample/1000, "kHz"
squares = tile(concatenate((ones(100), zeros(100)), axis=1), N)
xaxis = arange(0, N/f, (1/f_sample))
plot(xaxis, squares)
return squares;
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