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how lifting wavelet transform used to enhance the spatial resolution of the image,explain the basics for the same.
What specifically is your question here? The code you have included above will not run because you have not given us I. You'v...

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Simple MATLAB (noob) question
The way you set your x vector and then multiply by 60, you have increments of 4*pi (60*(pi/15)). Since you evaulate the cosine o...

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conversion of matrix into vector
Is this important that you write yourself? Because there is a reshape() function x = randn(10,10); y = reshape(x,100...

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STFT of one particular frequency
Each row in the output of spectrogram() is the information at one DFT bin as a function of the time segments. Fs = 1000; ...

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Can someone help me with symbolic differentiation?
The immediate cause of your problem is that MATLAB is case-sensitive and you want to use diff(), not Diff()

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How to install and start bioinformatics toolbox?
This is a question better addressed to the local administrator of your university's license.

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correlation of speech signal
Do you have the Signal Processing Toolbox? If so, you can use xcorr() I'll give you an example load mtlb; [xc,l...

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How to generate a square periodic wave?
Perhaps I don't understand your post, but if you create the square wave as shown above, then why can't you obtain the value of t...

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replacing NaN with zeros in a cell column of strings
One way is just with a for loop: for ii = 1:length(A) if isnan(A{ii}) A{ii} = 0; end end

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I need help with Probability function.
You can't specify inequalities in a computer language like you write them down on a piece on a paper. if (C >=1 && C <= 200...

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how to create two bell shape curves
Hi Jenka, you cannot just do sum(y), you are forgetting about the very important dx in the integral x = -10:0.01:10; y...

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syntax of handle: f = @(X)find(X);
Yes, you can use f = @find instead in this case. For example: y = zeros(10,1); y(3:end) = 3:10; f(y) The w...

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how to create two bell shape curves
Do you have the Statistics Toolbox? x = -10:0.01:10; y = normpdf(x,0,1); y1 = normpdf(x,0,sqrt(2)); If you do n...

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Amplitude specturm of Discrete Fourier Transform
You should read the help for fft()

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ifft after one fft
The DFT and inverse DFT are mappings from a N-dimensional complex vector space to an N-dimensional complex vector space. When...

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How to convert frequency spectrum to time domain waveform
If by "Then i modified/clipped/removed some signals in FFT spectrum figure file which are not required.", you mean that you remo...

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How to simply differentiate equations?
Do you have the Symbolic Toolbox? syms x t; v = cos(x)*sin(t); d2v_dx2 = diff(v,'x',2); d2v_dx2 has class sym

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Discrete Fourier Transform a dummy approach
Yes, the only problem you have is the use of the transpose operator. The transpose operator with complex-valued data returns the...

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Any sample to detest a sample template picture from a big picture
There are a few ways to go really. Certainly the Computer Vision System Toolbox has a number of possibilities for that: <http...

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what is framelet transform?
Because wavelet frames also have very desirable properties. For example: 1.) wavelet frames can be much more directionally s...

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how to generate white noise of particular frequency in matlab ?
White noise cannot be of a particular frequency. White noise by definition is a sequence of uncorrelated random variables. The a...

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How to draw a density function?
This appears to be a simple discrete random variable with a probability mass function. The problem is that in that case, you can...

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Zero crossing in audio signal signal processing
I don't think this is the way to do zero crossing, but at any rate, you can use NaN in the above to do the plotting you are tryi...

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Plotting energy density spectrum as a function of angular frequency
If you just want it in terms of angular frequency (radians/sample) and not (radians/second), the frequency bins are spaced at in...

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How To Generate Non Repeating Random Numbers from 1 to 49
p = randperm(49); p = p(1:10); Or just p = randperm(49,10);

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How do I get my code to recognise an empty function input?
isempty() should work y = input('What is your favorite color? ','s'); if isempty(y) y = input('Invalid, n...

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Can we identify a speaker using his/her cepstral coefficients calculated from MFCC?
Yes, but you'll have to implement some feature matching algorithm as well. The basic technique(s) are described in many papers. ...

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Trying to pass/ignore an Error in a loop.
Without more detail, I don't know if this will work in your scenario, but one possibility is a try block x = randn(3,2); ...

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The value of variance in function imnoise in case of gaussian is a bit confusing
imnoise works with an intensity image, so if you are inputting a unit8 image for example with values in the range [0,255], then ...

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find first value below a minimum in a vectorized way
I'm sure it's not the most elegant way, but A = [ 5,6,5,2,2,6; 7,6,4,4,2,4;9,5,4,2,4,2;7,6,5,5,4,3;5,6,8,7,8,9]; [I,...

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