MATLAB: Find position of the matrix

image processingmatrix manipulation

 x=0.0344    0.0018    0.0519    0.0181    0.0285    0.0393    0.0344    0.0344

find the position of each value and the further process taken the value one by one

Best Answer

    x(1), x(2) ... x(end),

Gives you each every value in the array.

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MATLAB: Fourier analysis of waveforms and clipping wave, HELP PLEASE!!!

I'm not sure how you are using the term "period" here. If you are talking about only the first 1 of the fundamental frequency which is 1 MHz here, then I think you want at least a few periods to do a spectral analysis even with a clean waveform. The resolution in the DFT (implemented by fft) depends on the number of samples. The more samples, the better the resolution.

In your case, it's easy to see that

xnew = x(1:2800);

gives you the initial waveform, so why not use this?

     Fs = 1/1e-8;
     d = fdesign.lowpass('Fp,Fst,Ap,Ast',1.2e6,1.4e6,0.5,60,Fs);
     Hd = design(d,'butter');
     xnew = x(1:2800);
     y = filter(Hd,detrend(xnew,0));
     ydft = fft(y);
     freq = 0:Fs/length(y):Fs/2;
     ydft = ydft(1:floor(length(y)/2)+1);
     % Plot in MHz
     plot(freq./1e6,abs(ydft))
     axis([0 10 0 max(abs(ydft))+20])
     xlabel('MHz'); ylabel('Magnitude');

If you copy and paste the above code, it works fine.

MATLAB: How to find a curve that pass through the scattered points in 3D

[th, r, z] = cart2pol(d(:,1),d(:,2),d(:,3));
[sr, idx] = sort(th);
sd = d(idx,:);
plot3(sd(:,1), sd(:,2), sd(:,3))

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MATLAB: Fourier analysis of waveforms and clipping wave, HELP PLEASE!!!

MATLAB: How to find a curve that pass through the scattered points in 3D

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