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I have a problem Problem understanding SPTool
Hi Don, Yes by default it gives you the spectrum from 0 to Fs/2 (the Nyquist frequency). You can use Mouse Zoom (under Options) ...

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Bandpass Filter By Using Butter
You haven't given us a lot to go on because we don't know what you mean by: "However, the plot of FFT Amplitudes doesn' t res...

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command for a certain graph
Hi John, See the help for bar3 For example: bar3(peaks(5))

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what is different between 'corr' and 'corrcoef'?
If you want a single correlation coefficient between two matrices, then neither, see corr2. For two matrices, corr() returns ...

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How to compute the PSD after generating a .m file from FDATool
You can look at the magnitude response of your filter with: fvtool(Hd) Or [H,W] = freqz(Hd); plot(W,20*lo...

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measuring the fundamental fequency
I think you're better off not just relying on the DFT (Z-transform on the unit circle) to estimate fundamental frequency. For a ...

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Generate C code from a filter which created by fdatool or filterbuilder
Look under File -> Generate Matlab Code -> Filter Design Function. If I choose that option and then make some adjustments in the...

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About latex command in the title
Hi, You should use the LaTex interpreter. figure; title('$$Q \geq \frac{I_h H}{I_h H+I_z C}, b_1 \geq b_2$$','interprete...

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Generate C code from a filter which created by fdatool or filterbuilder
What version of Matlab are you using? If you are using R2012a, generate the Matlab code with "Filter Design Function" or with th...

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Generate C code from a filter which created by fdatool or filterbuilder
Yes, you can, but you'll need a coder product, e.g. Matlab Coder, or Simulink Coder. You can export MATLAB code for your filter ...

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Is 0.001Hz resolution possible with a 2.5Ms/s file while preserving the time resolution?
It sounds like you have dt = 1/2.5e6; N = 600/dt; N samples is that correct? To achieve a frequency resolution of...

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What dashed lines in magnitude response mean?
If you have the DSP system toolbox, you automatically get a "mask" that shows how close your designed filter comes to your speci...

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fft for financial time series
Below is an example. t = 0:2607; % just an example % put a sine wave with a period of 120 days and add noise x...

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Does anyone know how to calculate a 12 hours signal (Climatic data)?
You can do that by sampling every hour hrs = 0:59; % 5 periods for example x = cos(2*pi/12*hrs);

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I keep getting a syntax error with my program???
x=input('Enter value for x: '); y=input('Enter value for y: '); if x==0 & y==0 disp('This point is located at the origin....

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Simple question regarding sorting
X = randi(30,100,1); Y = randi(30,50,1); Z = unique([X ; Y]); The result from unique() is sorted.

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Editor powers and prominence of the buttons
Hi Daniel, Wasn't it Spiderman's uncle (Ben Parker) who so wisely said: "With great power comes great responsibility" :)

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literature associated with the periodogram function
The periodogram is described in any number of texts on time series analysis. Here are a few: Percival, D.B. & Walden, A.T. Sp...

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How to perform 2-D DFT via 1-D DFT
It actually doesn't matter, but you can do this X = randn(8,8); Y = fft2(X); % ok let's first take the DFT along the row...

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spectral analysis for time series data
One way plot(F,10*log10(xper)); set(gca,'xtick',[1/20 1/12 1/8 1/6 1/4 1/2]); H = 1./(get(gca,'xtick')); set(gca,'xtic...

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How to convert a scalar data into complex ?
A scalar can be complex by definition. A scalar is just a number. So I'm assuming you have real-valued data to start with. How a...

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spectral analysis for time series data
Because you have a real-valued signal, the power spectral density is an even function of frequency. Therefore, there is no need ...

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ecg signal in different frequency bands
Siddartha, Are you sure you want a band like 0-0.04 Hz? At that point you are essentially just asking for the DC component of th...

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help regarding starting simulink
Have you worked through the Simulink documentation and looked at the example models there? Also there are number of good tutoria...

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Filter Object Not Filtering Data?
You are not designing a filter with the same sampling frequency as your input signal. The sampling rate of your sine wave is 1 g...

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ecg signal baseline wandering
What does your "wandering baseline" look like? does it just look like linear trend? piecewise linear? If so, you can just use...

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butter filter
If you want to pass 900 Hz and reject the other frequencies, you need a highpass filter. You have designed a lowpass filter. Why...

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CDF of gamma distribution
I'm not sure how you are calling it, but you should get the same result with gamcdf and gammainc, provided you scale the x vecto...

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bior 3.5 wavelet filter
As Walter states those are the number of vanishing moments for the scaling and wavelet filters for both the reconstruction (synt...

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hanning window
The Hann and Hanning window are both implemented in MATLAB by the same basic equation w = 0.5 - 0.5*cos(2*pi*x); There is ...

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