Why do I get incorrect argument when calling "indeces"?

Question

Alia Hicks 2020-8-13

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/579318-why-do-i-get-incorrect-argument-when-calling-indeces

回答： Steven Lord 2020-8-13

Why do I get this error about indeces?

" 'Check for missing argument or incorrect argument data type in call to function 'indices'. Error in AdaptdFilteredThenFFTed (line 38) indices PSD>35000; "

I'm borrowing the line of code defining it and any other lines using it from another program.

dt = .001;
t = 0:dt:3.999;
ich = AdaptiveFilteredData.VarName1;
qch = AdaptiveFilteredData.VarName2;
%plot(ich,qch);
%plot(t,ich);
%plot(t,qch);
                           %% Amp vs Time plot
figure;
plot(t,ich)
xlabel('time(s)');
ylabel('Amplitude');
grid on
%% FFTed 
Nsamps = length(ich);                  % Window length
y_fft = abs(fft(ich));                 %Retain Magnitude
%f = fs(1/(dt*n)*(0:n));
f = fs*(0:Nsamps/2-1)/Nsamps;           %Prepare freq data for plot
                           %% Plot Mag vs Freq 
figure;
plot(f, y_fft(1:length(f))); 
%Magnitude vs Freplot(f, y_fft);                         % FFT plot
xlim([0 1]);
xlabel('Frequency(Hz)');
ylabel('FFT Magnitude'); 
grid on
%% Clean Then Revert 
PSD = y_fft.*conj(y_fft)/Nsamps;
indices PSD>35000; 
PSDclean = PSD.*indices;
fhat = indices.*fhat; 
ffilt = ifft(fhat); 
                            %% PlotClean Amp vs T
figure;
plot(t,ffilt);

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Answer 1

Steven Lord 2020-8-13

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/579318-why-do-i-get-incorrect-argument-when-calling-indeces#answer_479532

You're missing the equals sign (=) that would assign the result of the computation PSD>35000 to the variable indices, so MATLAB thinks you're trying to pass the char vector 'PSD>35000' into a function named indices. To fix, add the equals sign.