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Question regarding fft output
The frequency axis is incorrect. The DF is not 1. The "bins" in the DFT are spaced at Fs/N where Fs is the sampling frequency, s...

presque 13 ans il y a | 0

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A graph in matlab, needs some guidance
x = 1:0.1:4-0.1; y = [0.5 0.35 0.15]; ynew = zeros(size(x)); ynew(1:10:end) = y; ynew = filter(ones(10,1),1,y...

presque 13 ans il y a | 0

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How to apply 90 degrees phase shift to a voice signal.?
If you have the Signal Processing Toolbox, you can use hilbert() to obtain the analytic signal and use the imaginary part. ...

presque 13 ans il y a | 2

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Changing the dimensions of my matrix
There are better ways to implement this in the Wavelet Toolbox by using wdencmp for example. If you want to do it your way by...

presque 13 ans il y a | 0

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Dos command gives error
Try this to get the correct path and string options [file, path] = uigetfile('*.m', 'Select File'); fullFilename = fullfil...

presque 13 ans il y a | 0

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how t run .cpp file in matlab..? I'm working on Mac and i have xcode 4.6 give me the solution
You're going to need to create a MEX file. Please see: <https://www.mathworks.com/help/matlab/build-cc-mex-files.html> One...

presque 13 ans il y a | 1

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Finding ifft for a variable function
Or if you have the Symbolic Toolbox, you can use ifourier to obtain the inverse Fourier transform symbolically.

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i got negative value for sfdr and snr=61.4315 which are not the desired answer.i don't know which part that must be fixed to get the value of sfdr=70.9 and snr=60.7
If you have R2013a with the Signal Processing Toolbox, there is a new function for spurious free dynamic range <https://www.m...

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??? Undefined function or method 'irisBasisSVD' for input arguments of type 'double'.
Your answer to my question means that the only variable in that .mat file is a single row vector, T. Accordingly, you cannot...

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??? Undefined function or method 'irisBasisSVD' for input arguments of type 'double'.
Are you sure that when you load the irisBasisSVD.mat file, that the variable(s) inside the .mat file is actually called irisBasi...

presque 13 ans il y a | 0

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Function in M file doesnt recognize the variable L defined in the command window
I told you that your syntax would not work: "Finally, your syntax: diff(L,[x1 x2]) is not going to work. Read the help...

presque 13 ans il y a | 0

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What is the difference between wavelets and framelets??
Yes and no. The discrete wavelet transform is often used as synonymous with the discrete nonredundant (critically-sampled) w...

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delay in digital filtering
One thing you can try is using filtfilt() You have not given specifics about what kind of filter you used and how long your f...

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how to apply db6 wavelet to the decomposed signal??
I'm not sure what you mean by apply the db6 wavelet to the "decomposed" signal. Usually, you mean to use the db6 wavelet in t...

presque 13 ans il y a | 0

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Beaglebone support is the near reality?
Hi Ruslan, I do not believe that anyone from MathWorks will discuss future development plans in this forum. Have you contacted M...

presque 13 ans il y a | 1

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Pre emphasis filter in MFCC
n is the just the "time" index of the discrete-time signal (in this case a speech signal). You can implement this filter in MATL...

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Function in M file doesnt recognize the variable L defined in the command window
You need to have L as an input argument in your function. Functions do not reach into the command window to read variables there...

presque 13 ans il y a | 0

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Please, help me. How can I calculate the inverse fourier transform without use the ifft function?
If you have the discrete Fourier transform for the positive frequencies as a vector in MATLAB, then (if the signal is real-value...

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How do I retreive the data, samples, from a audioplayer object
I'm not sure what you mean by "you don't have access to SoundData" What is SoundData? Normally you feed audioplayer, the d...

presque 13 ans il y a | 0

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?? Undefined function or method 'svd' for input arguments of type 'double' and attributes 'full 3d real'.
svd() only works on a 2-D matrix, although I'm surprised by your error message. I would have expected: "Error using svd I...

presque 13 ans il y a | 0

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Text on matlab plot
figure; for nn = 1:10 h = text(0.45,0.45,num2str(nn)); pause(.5); reset(h) end You can use num2str()...

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Why does comparing identical doubles result in a logical 0?
This is the well-known (and often treated in this forum) problem of floating-point precision. The point is that they are not ide...

presque 13 ans il y a | 1

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I need to calculate time-evolving power spectral density using Matlab periodogram function
You cannot have a PSD estimate on the same time scale as the original signal. That would mean that you have a PSD estimate based...

presque 13 ans il y a | 0

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Subscripted assignment dimension mismatch
It comes from trying to assign something of one size to a set of indices that does not match that size. For example. X = r...

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Image-Processing to Computer-Vision
The Computer Vision System Toolbox *requires* the Image Processing Toolbox, so why do you want to try and separate the two? You ...

presque 13 ans il y a | 0

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How to detect rise and fall of a sparse signal?
If it really always goes from 0 and returns to zero. You can use idx = find(x>0); You can then look at the diff() of thos...

presque 13 ans il y a | 3

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value of Z in in the program doesn't take above 255?? program used for edge detection('salt & pepper nois'e)
The program is most likely designed to work on uint8 data - that data is in the range [0, 255] for 2^8 data values.

presque 13 ans il y a | 1

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Error using + Matrix dimensions must agree
You have to look at the size of results.cov and parm. Are they compatible for addition? You can use size(results.cov) ...

presque 13 ans il y a | 0

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I need to calculate time-evolving power spectral density using Matlab periodogram function
Just use surf(), you can easily work out a "meaningful" time vector but you have to look at the why buffer() has prepended and a...

presque 13 ans il y a | 0

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Dropping Wavelet Coefficients After Wavelet Transform
So why not reconstruct the approximation using the inverse wavelet transform? That is the whole basis of wavelet denoising. H...

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