Specify discrete transfer functions in DSP format
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I use the function 'filt' to specify discrete transfer functions in DSP format for state space system .
num=cfirpm(60,[-1 -0.5 -0.4 0.7 0.8 1],@lowpass);
den=[1 0];
TF= filt(num,den);
I found this warning : the numerator or denominator of this transfer function has complex-valued coefficients.
How can i solve this problem ?
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