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How can I reconstruct the details and approximation after using 'swt' (stationary wavelet decomposition) of the wavelet toolbox?
Hi Marie, Not directly for SWT, but there is a work around. Let me say however, that starting in R2015b there is MODWT-MODWTMRA ...

8 years ago | 1

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how to save result of for loop
Outside the loop allocate a 3D matrix of zeros Smat = zeros(n,n,p); % p here is the upper bound on the for loop Then ins...

8 years ago | 0

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Question about ilaplace()
I think you mean dirac(2,t) and not dirac(t,2) There is a function in Symbolic Toolbox called dirac() that takes the...

8 years ago | 0

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How to find psi function in Haar continuous wavlelet transform:CWT
Hi Hai, For the CWT you will get 10 rows. For the MODWT, the final row is the scaling coefficients as you guessed. Yes, when ...

8 years ago | 1

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Why is my fft peak frequency slightly lower than my known input signal?
Hi David, You are using the wrong sampling frequency. The actually sampling frequency is 51200. You can see this by entering ...

8 years ago | 0

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How to find psi function in Haar continuous wavlelet transform:CWT
Hi Hai Tran, If you are using dyadic scales as you do above, I think you would be better to use the MODWT (introduced in R2015b,...

8 years ago | 1

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Answered
Why is my fft peak frequency slightly lower than my known input signal?
Hi David, we don't see what fs is in your code above, but in general your code looks like it would generate the expected answer....

8 years ago | 2

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Answered
How do i compare FFT of signals, where Amplitude decreases by increasing sampling time?
The problem is in your x2 signal, the frequency 320 Hz does not fall in a DFT bin because you data length is 1310 samples and yo...

8 years ago | 0

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Wavelet synchrosqueezed transform decomposition
Hi Marc, synchrosqueezing and the closely related continuous wavelet transform do not provide perfect reconstruction of the inpu...

8 years ago | 1

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Answered
How to add specific rows that meet a condition?
How about just [sum(B(A<=1)) sum(B(A>1 & A<=2))]

8 years ago | 0

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FFT default process when samples are NOT a power of 2?
That is not part of a MathWorks' product. It is part of the this tool on the file exchange <http://www.mathworks.com/matlabcent...

8 years ago | 0

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Answered
Discrete Wavelet Transform-Based Satellite Image Resolution Enhancement
Hi Meena, I would start by looking at this paper <http://www.ijcsit.com/docs/Volume%25204/Vol4Issue6/ijcsit2013040619.pdf sup...

8 years ago | 0

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Wavelet synchrosqueezed transform decomposition
Hi Marc, the synchrosqueezed transform does not specifically provide "details" like the discrete wavelet transform, but it does ...

8 years ago | 1

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Error related to "wden" in wavelet toolbox
Hi Steven, This code runs correctly on R2014a. snr = 3; init = 2055615866; [xref,x] = wnoise(3,11,snr,init); lev ...

10 years ago | 1

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Answered
How can I calculate 2D wavelet coefficients for multi resolution analysis given a 2D Array?
Varun, to respond to this: _"Sorry for commenting on my own post, but could someone explain the principle of wavelet tree dec...

10 years ago | 0

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How can I calculate 2D wavelet coefficients for multi resolution analysis given a 2D Array?
Hi Varun, Do you want the 2-D wavelet coefficients or wavelet packet coefficients? Those are different transforms. Your post ind...

10 years ago | 0

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Visualizing Gabor filters using mesh
Unless you have posted the incorrect version of my_gabor_filter.m, I show that it errors on this line actually: exp3 = (e...

10 years ago | 0

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How to put errorbars
Do you have the Statistics Toolbox? x = 1:10; y = sin(x); e = std(y)*ones(size(x)); plot(x,y,'b') hold on...

10 years ago | 0

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error in writing an equation
x = 0:.01:5; y = (3*sin(x).*cos(x))./((sin(x).^3)+(cos(x)).^3);

10 years ago | 1

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Answered
send function to a function
You should always report the errors you get, that is very helpful in allowing people to help you. I see a number of immedia...

10 years ago | 0

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matrix shape is incorrect??
You don't give us all the variables here so we can't tell you how to change in the loop, but the simple thing to do is at the en...

10 years ago | 0

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plot normal distribution plot on histogram of residuals
Here is one way, I'll use Data as the residuals Data = randn(1000,1); %just making up some junk data binWidth = 0.7; %This...

10 years ago | 1

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Answered
??? Undefined function or method 'gauss' for input arguments of type 'double'.
I'll leave aside whether it is prudent to fit a normal distribution to these data. Do you have the Statistics Toolbox install...

10 years ago | 0

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??? Undefined function or method 'gauss' for input arguments of type 'double'.
gauss() is not a MathWorks' function. Have you downloaded this function from somewhere? If so, you need to add the folder whe...

10 years ago | 0

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How to create categorical array from integer array?
Which version of MATLAB are you running? I do not have any problem executing that code on R2014a or R2013b. If you enter ...

10 years ago | 0

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Answered
count 1's in binary
Hi Sasha, I'm presuming your binary number is a character array: s = '001111000000011100000000011111'; K1 = strfind(s,'1...

10 years ago | 0

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Bug in matlab R2012b version
In R2012b with win7 and a 64-bit machine I get the following: A = 0.5:0.1:.8; abs(A(3)-0.7) ans = 1.1102e-16 ...

10 years ago | 0

Answered
hi members i have error using my matlab code "Subscripted assignment dimension mismatch" plz help me out.
There is no error there unless you have already set B equal to something in your workspace, clear the variables used here and th...

10 years ago | 0

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How to save an array output to file every 1000 iterations?
OK, so simply change the filename each time. In the following example I just create a file called Iteration1000.txt, Iteration20...

10 years ago | 0

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Why the amplitude of fft computing is a little bit different from a known value?
You have to realize that the frequency spacing between DFT elements depends on the length of the DFT and the sampling frequency....

10 years ago | 1

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