Plot 3D matrix with complex values

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nour besbes
nour besbes 2019-9-23
回答： Sara James 2019-10-21
I have a matrix of complex values (a i +b), with shape 128 * 8 * 121. How can I plot it, please ?
Thank you so much in advance :)
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darova
darova 2019-9-23
What do dimension mean? (128 x 8 x 121) ?
nour besbes
nour besbes 2019-9-23
it's a 3D matrix. It means 8 matrix of (128 rows X 121 columns ) size.

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回答（3 个）

Matt J
Matt J 2019-9-23
编辑：Matt J 2019-9-23
One way,
plot(a(:),b(:),'x')
darova
darova 2019-9-23
Try pcolor
pcolor(A(:,1,:)) % display first matrix
Sara James
Sara James 2019-10-21
As another mentioned previously, use pcolor. Note that since your signal is complex, you will have to take the absolute value first as follows:
fs = 3000; % Sampling frequency (Hz)
t = 0:1/fs:1-1/fs; % Time (sec)
x = [exp(2j*pi*100*cos(2*pi*2*t))+randn(size(t))/100; ...
exp(2j*pi*100*cos(0.5*pi*2*t))+randn(size(t))/100; ...
exp(2j*pi*100*cos(1*pi*2*t))+randn(size(t))/100]'; % Multi-channel signal
[S,F,T] = stft(x,fs,'Window',hamming(128,'periodic'),'OverlapLength',50);
smag = mag2db(abs(S)); % Convert to dB
caxisLims = max(smag(:)) + [-60 0]; % Color axis limits
figure('Name','STFT')
numChannels = size(x,2);
for ii = 1:numChannels
subplot(2,2,ii)
pcolor(T,F,smag(:,:,ii))
xlabel('Time (s)')
ylabel('Frequency (Hz)')
shading flat
hC = colorbar;
hC.Limits = caxisLims;
hC.Label.String = 'Magnitude (dB)';
title(sprintf('Channel %d',ii))
end
sgtitle('Spectrogram')

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