Numpy warning:Casting Complex to real discards imaginary part
The warning is coming from the plot command -- I'm pretty sure. "plot" is meant to take a 1d, real array and put it on the screen. When it sees an array of complex numbers it does the best it can, i.e. discards the imaginary part and plot the real part.
You might want to try something like
plot(numpy.real(demod),'wo')
plot(numpy.imag(demod),'wo')
if you want to see both parts.
marriam nayyer
Updated on July 31, 2020Comments
-
marriam nayyer almost 4 years
i am trying a Matlab code in Python
my code gives a warning
/usr/lib/python2.7/dist-packages/numpy/core/numeric.py:235: ComplexWarning: Casting complex values to real discards the imaginary part
return array(a, dtype, copy=False, order=order)
Python Code
demod_1_a=mod_noisy*2*cos((2*pi*Fc*t)+phi) N=10 Fc=40 Fs=1600 d=firwin(numtaps=N,cutoff=40,nyq=Fs/2) print(len(d)) Hd=lfilter( d, 1.0, demod_1_a) print(len(Hd)) y2=(convolve(Hd,raised))/Convfac print(len(y2)) y2=y2[(sa/2)-1:-sa/2] print(len(y2)) demod_3_a=y2[(sa/2)-1::sa] print(len(demod_3_a)) demod_1_b=-1*mod_noisy*2*sin((2*pi*Fc*t)+phi) Hd2=lfilter(d,1.0,demod_1_b) y3=(convolve(Hd2,raised))/Convfac y3=y3[(sa/2)-1:-sa/2] demod_3_b=y3[(sa/2)-1::sa] #########3333 #Demod demod=demod_3_a+(1j)*demod_3_b print((demod)) plot(demod,'wo') show()
this code is giving me results but not desired results.i wanted to ask that how does this warning will effect my Code? and what is the solution to get rid out of this warning.Please help