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 ...

ungefär 8 år ago | 1

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...

ungefär 8 år ago | 0

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

ungefär 8 år ago | 0

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 ...

ungefär 8 år ago | 1

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 ...

ungefär 8 år ago | 0

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,...

ungefär 8 år ago | 1

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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....

ungefär 8 år ago | 2

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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...

mer än 8 år ago | 0

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

mer än 8 år ago | 1

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

mer än 8 år ago | 0

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...

mer än 8 år ago | 0

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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...

mer än 8 år ago | 0

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

mer än 8 år ago | 1

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 ...

mer än 9 år ago | 1

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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...

nästan 10 år ago | 0

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...

nästan 10 år ago | 0

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...

nästan 10 år ago | 0

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...

nästan 10 år ago | 0

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

nästan 10 år ago | 1

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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...

nästan 10 år ago | 0

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...

nästan 10 år ago | 0

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...

nästan 10 år ago | 1

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??? 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...

nästan 10 år ago | 0

??? 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...

nästan 10 år ago | 0

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 ...

nästan 10 år ago | 0

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

nästan 10 år ago | 0

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 ...

nästan 10 år ago | 0

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...

nästan 10 år ago | 0