I'm not sure how to fix this error Warning: Integer operands are required for colon operator when used as index. > In demo (line 147)

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Bobby
Bobby 2021-12-19
评论： Bobby 2021-12-19
%convolution
y1 = conv(x,h1)*Ts; %multiply by interval Ts to get integral
Nsamps = length(y1); %Nsamps is the length of array y1
t = (Ts)*(1:Nsamps); %Prepare time data for plot
figure
plot(t,y1);
xlim([1.5 1.51]); %only plot t within xlim
xlabel('Time (s)');
ylabel('Amplitude');
title('Convolution with 200Hz Cutoff');
%Do Fourier Transform of the 200Hz Cutoff signal
y_fft = abs(fft(y1 * 5)/Fs); %Normalize the signal & Retain Magnitude
y_fft = (y_fft(1:Nsamps/2)); %Discard Half of Points
f = Fs*(0:Nsamps/2-1)/Nsamps; %Prepare freq data for plot

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采纳的回答

Voss
Voss 2021-12-19
This is probably due to the fact that Nsamps is odd, so that Nsamps/2 is not an integer, so that this line:
y_fft = (y_fft(1:Nsamps/2)); %Discard Half of Points
produces the warning. It's just a warning (not an error), so you don't need to 'fix' it, but you can avoid it by only using integers with the colon operator when used as indexes. For instance:
if rem(Nsamps,2) == 1
y_fft = y_fft(1:(Nsamps-1)/2);
else
y_fft = y_fft(1:Nsamps/2);
end
or, equivalently:
y_fft = y_fft(1:(Nsamps-rem(Nsamps,2))/2);

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