Answered
Trouble with LL in DWT2
Hi Jagdeesh, you're not giving us enough to go on. The classic Lena image is not included in the Wavelet Toolbox as far as I am ...

14 years ago | 0

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matlab to dll code
Hi Rajes, you can do that with MATLAB Compiler: <http://www.mathworks.com/products/compiler>/

14 years ago | 0

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Permission denied when I write an audio file
Do you have write permission in the directory you are trying to write the .wav file? Is a .wav file by that name and in that...

14 years ago | 0

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How to differentiate low ang high pitch frequencies from a media file
You can use fft()

14 years ago | 0

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function min
Hi, you cannot. That is a built-in (compiled) function. The source code for the function and others like is not shipped with MAT...

14 years ago | 1

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if statement after use input
Yes, Variablein = input('type 1,2,or 3:\n'); if (Variablein == 3) disp('You typed 3'); end For a string: V...

14 years ago | 1

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deleting number
Hi, You can use intersect to get the indices of A that intersect with elements of B and then delete those. [C,IA,IB] = in...

14 years ago | 0

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Time on X-axis
After calling plot() with datenum() use datetick datetick('x','HH:MM:SS') For example: x = linspace(now, now+1...

14 years ago | 1

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Displaying both freq and period on x-axis in freq anal
See: <http://www.mathworks.com/help/techdoc/creating_plots/f1-11215.html> You can easily put one x-axis on the bottom and ...

14 years ago | 0

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abs(0.01) > 0.01 is false? The answer is weired!
You actually are using >= in your code even though your post says >, I think you should consider the following wiki: <http:...

14 years ago | 3

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Answered
decomposition using dwt2
You should format your code above for readibility. It sounds like all you have to do is use a grayscale colormap. >>colo...

14 years ago | 0

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Answered
Compression Ratio
You can use wcompress from the Wavelet Toolbox and select from among several wavelet compression methods,each with optional para...

14 years ago | 0

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error in kmeans
What version of MATLAB are you using? Are you sure you are using a MathWorks' version of kmeans.m? If you enter: >>which km...

14 years ago | 0

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Tutorial for beginner?
There are many MATLAB tutorials available online. Also, the MATLAB Getting Started Guide is a good place to start. <http:...

14 years ago | 0

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Answered
Drawing slope
You do not say which of your elements above is the intercept and which is the slope. x = -2:.01:2; y = m(1)+m(2)*x; p...

14 years ago | 1

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DWT2 on an RGB image.
Hi Jessica, I suspect your problem is just scaling. What is your input image data type (uint8?) For example: load jell...

14 years ago | 0

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Answered
Time scaling with IFFT
Hi, I see a number of issues here. One issue you have right away is that your H_f is not conjugate-symmetric and therefore is t...

14 years ago | 0

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Answered
need syntax
The Communications System Toolbox has System objects for QPSK modulation and demodulation: See comm.QPSKModulator and comm.QP...

14 years ago | 0

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time average of every 100 samples
You can do something like this: x = randn(4000,1); x1 = reshape(x,100,40); y = mean(x1); Now you have the mean o...

14 years ago | 1

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what is siftwin 32
I'm guessing that you are referring to David Lowe's SIFT keypoint detector. siftwin32.exe is the Windows executable and they ...

14 years ago | 1

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Answered
norm square
Is Pu a vector resulting from multiplying a vector by a matrix P = randn(2,2); u = randn(2,1); norm(P*u,2)

14 years ago | 1

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Answered
Comparing the spectra of two acoustic signals
Note that I have not bothered with scaling the Fourier transforms to obtain proper power spectral density estimates. And just fo...

14 years ago | 0

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Comparing the spectra of two acoustic signals
Hi you can look at the individual spectra: [x,fs] = wavread('metal.wav'); psdx = psd(spectrum.periodogram,x,'Fs',44100,'...

14 years ago | 0

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Solution for a homogeneous equation using null space
Hi Harry, I get a rank of 6 for this matrix and therefore expect the nullspace to have dimension 2. I get the following ONB for ...

14 years ago | 0

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Smooth
From the part Sean merged in, perhaps it doesn't make sense in your application to smooth the columns of the matrix separately. ...

14 years ago | 1

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Smooth
smooth operates a column vector, so you could loop over the columns of the matrix; I don't know how big your matrix is. X =...

14 years ago | 1

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how to proceed with image denoising based on wavelets
Hi Geetha, Daniel is correct that your question is very broad. However, there is a lot of material in the Wavelet Toolbox doc...

14 years ago | 0

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Encoding for image wavelet transform
Hi, I'm not sure exactly what your question is, but see the help for wcompress(). The Wavelet Toolbox supports a number of compr...

14 years ago | 0

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Answered
DFT
With all due respect to that author, I think she is overstating her point. The DFT takes a N-point periodic vector (the N-point ...

14 years ago | 0

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DFT
Hi Lisa, you had a couple problems with your code: N= 4; x=1:4; for k=0:3 for n = 0:3; y(n+1) = x(n+1).*ex...

14 years ago | 0

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