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i have this problem in the picture below ...can u help me about the problem??
sin(x) and cos(x) require parentheses about their arguments. So you need to say sin(u(3)) and cos(u(3))

environ 9 ans il y a | 0

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Clipping an audio signal
You're clobbering the values in your for-loop. Try defining maxX = max(X) and minX = min(X) before modifying X.

environ 9 ans il y a | 0

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Disadvantages of using large NFFT value in pwelch/spectrogram
You can mean one of two things by frequency resolution: # The frequency spacing between computed estimates (sometimes called ...

environ 9 ans il y a | 2

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additional findchangepts function output
I don't think I have a good answer to this. The 'mean' option works by performing a sum residual square error, introducing a co...

environ 9 ans il y a | 0

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additional findchangepts function output
#2 You can get close to this by running FINDCHANGEPTS once with a given threshold, finding all segments that are too long, and ...

environ 9 ans il y a | 0

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additional findchangepts function output
#1 Maybe something like: function y = fitchangepts(x, icp, statistic) y = nan(size(x)); K = length(icp); ...

environ 9 ans il y a | 0

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what is mean Nfft, Nwind, Window and Overlap?
https://www.mathworks.com/help/signal/ref/pwelch.html

environ 9 ans il y a | 0

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How to use xcorr function in matlab as autocorr
out = xcorr(x,x(25:end))

environ 9 ans il y a | 0

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Eucliedan Distances In two Arrays
You can also use <https://www.mathworks.com/help/signal/ref/findsignal.html findsignal> if you have a recent copy of the Signal ...

environ 9 ans il y a | 0

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Trying to make a sudoku puzzle generator
I like your randperm() idea. You can use it to do the scrambling without any for-loops at all. You may safely transform a va...

environ 9 ans il y a | 0

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Why can't I plot a spectrogram in my GUI?!?
Looks like you're trying to redirect the auto-generated debug plot of the spectrogram to a dedicated figure, and it's failing be...

environ 9 ans il y a | 3

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Given the coordinates of a centroid, find the nearby pixels with the same color.
Have a look: <https://www.mathworks.com/help/images/ref/edge.html#examples>

environ 9 ans il y a | 0

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lpc function for smaller intervals
In my version, line 64 generates an error when your input signal is empty (i.e. has no data). Set a trap on it and then cli...

environ 9 ans il y a | 0

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mean fundamental frequency
If you have a recent copy of the Signal Processing Toolbox, you can search for "meanfreq"

environ 9 ans il y a | 0

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How can you get the x and y values from plotted points on a quiver plot?
You'll want to get the line handle. Something like: >> hq = quiver([1 2 3],[3 1 2],[4 1 5],[2 1 2]) hq = Qu...

environ 9 ans il y a | 1

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Why is spectrum.periodogram not recommended, and how to substitute pwelch in it's place?
If you have R2015a or later, try <https://www.mathworks.com/help/signal/ref/medfreq.html medfreq>. The spectrum package is no...

plus de 9 ans il y a | 0

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Median Frequency(Fmed)
Try: <https://www.mathworks.com/help/signal/ref/medfreq.html medfreq> Introduced in R2015a.

plus de 9 ans il y a | 1

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How can I find and plot the change in frequency of a signal?
Assuming you have the Signal Processing Toolbox and your data x is uniformly sampled with sample rate Fs: z = hilbert(x); ...

plus de 9 ans il y a | 1

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How to find a change of slope in signal
Try findchangepts. Look for 'linear'

plus de 9 ans il y a | 0

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comparing two sentences of strings
Search the internet for "edit distance". MATLAB has a variant that works on real signals, called EDR. It does insertion/deleti...

plus de 9 ans il y a | 0

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How does DTW penalize stretching ?
Have you tried EDR? It penalizes stretching. It might be helpful to post the data you are trying to compare.

plus de 9 ans il y a | 0

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How to optimize the parameters in fillgaps function?
I find the default values work for me; but sometimes if I have a big signal with lots of missing values, limiting the length of ...

plus de 9 ans il y a | 0

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Finding the better function to calculate the Dynamic time warping distance (DTW)
If you have the R2016a Signal Processing Toolbox, have a look at: http://www.mathworks.com/help/signal/ref/dtw.html You'll...

plus de 9 ans il y a | 0

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medfilt1omitnan error
You might have an older copy of the Signal Processing Toolbox. NaN behavior was added in R2015b.

plus de 9 ans il y a | 0

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How to use medfilt1 on different computers
If you have an R2016a install but without the Signal Processing Toolbox, you can try looking for MOVMEDIAN.

plus de 9 ans il y a | 1

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How to fill timeseries data using interpolated data then have a nice contour plot
If you have a copy of the R2016a Signal Processing Toolbox, try fillgaps. Seems to work okay on your density grid (I've lim...

plus de 9 ans il y a | 0

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Bandpower function produces same results for different bands
You might not be giving it enough data to resolve the lower frequencies. You generally will have a resolution on the order of f...

plus de 9 ans il y a | 0

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Plotting a peak envelope
If you have HILBERT then you have access to the Signal Processing Toolbox. If you have R2015b or later, try using ENVELOPE: ...

plus de 9 ans il y a | 0

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How can I perform a piecewise linear fit to data?
If you have the R2016a Signal Processing Toolbox, you can try FINDCHANGEPTS.

plus de 9 ans il y a | 1

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How to get an "optimal" piecewise linear spline for any functions?
If you have R2016a Signal Processing Toolbox, you can try FINDCHANGEPTS with 'linear' to find the locations.

plus de 9 ans il y a | 0