Answered

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 ...

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

Answered

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...

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

Answered

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...

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...

ungefär 8 år ago | 0

Answered

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 ...

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

Answered

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 ...

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

Answered

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,...

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

| accepted

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....

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

| accepted

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...

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

Answered

Wavelet synchrosqueezed transform decomposition

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

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

| accepted

Answered

How to add specific rows that meet a condition?

How about just [sum(B(A<=1)) sum(B(A>1 & A<=2))]

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

Answered

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...

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

| accepted

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...

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

Answered

Wavelet synchrosqueezed transform decomposition

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

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

Answered

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 ...

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

| accepted

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...

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

Answered

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...

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

Answered

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...

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

Answered

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...

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

Answered

error in writing an equation

x = 0:.01:5; y = (3*sin(x).*cos(x))./((sin(x).^3)+(cos(x)).^3);

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

| accepted

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...

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

Answered

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...

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

Answered

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...

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

| accepted

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...

??? 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

Answered

??? 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...

??? 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

Answered

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 ...

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

| accepted

Answered

count 1's in binary

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

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

Answered

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 ...

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

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...

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

Answered

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...

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...

nästan 10 år ago | 0

Answered

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....

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....

nästan 10 år ago | 1

| accepted