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Function in Matlab
I'm not exact sure what you are asking, so perhaps you can clarify. You can declare a variable to be global >> global ...

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avoiding for loop
A=[1 2 3 4 5]'; B=[4 5 6 2 1]'; C = [A B]; D = C(:,2)-C(:,1); out = [sum(C(D>0,:),2); diff(C(D<=0,:),[],2)]

environ 14 ans il y a | 0

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creation of exe file
See the help for mcc and mccinstaller and deploytool The documentation walks you through a simple example: <http://www.mat...

environ 14 ans il y a | 0

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How to implement nise of specific bandwidth?
Take a broadband noise and the use a bandpass filter. Keep in the mind that the noise samples will be autocorrelated after you u...

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How to round the decimals?
One way here is: X = 0.135678; format bank; X Another way is: format; %just returning the formatting ...

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Append/Alter string in Title
plot(randn(100,1)); h = title('Test'); origtitle = get(h,'String'); set(h,'String',[origtitle ' 2'])

environ 14 ans il y a | 1

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imfilter
Zhang, the difference is that there is a rotation of the kernel by 180 degrees (pi radians) between the two. So for: h...

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imfilter and filter2
Yes, they are the same in some instances: h = 1/100*ones(10,10); x = randn(20,20); y = filter2(h,x); y1 = ...

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How to use Semilogy in MATLAB
Why are you using semilogy in a for loop where you are only plotting a single value for A at a time? Save the values of A in ...

environ 14 ans il y a | 0

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Sin Cos calculation for a regression
The (2*pi) is just because you are converting the frequencies from cycles\day into radians\day. When you then multiply that by d...

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3D image
What format is it? You can use imread() for a number of formats. If it is just stored in a .mat file, then use load()

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Regression Fit a SinWave to a dataset?
You are not using what I gave you. You are using %betahat = X/y; Look at the example I gave you: y = score(:); %make...

environ 14 ans il y a | 0

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Regression Fit a SinWave to a dataset?
Because when you do a spectral analysis, the frequency spacing in your case is 1/501. So you only get frequency estimates at 0, ...

environ 14 ans il y a | 0

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Regression Fit a SinWave to a dataset?
Something is probably off in your spectral analysis in identifying the frequency. You have 501 points, which means the spacing b...

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Turning array values into values on an x axis
x = ones(500,1); indices = [2 3 6 9]; x(indices) = 2; Or x = ones(500,1); x(indices) = x(indices)+1;

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How do i create a matrix of size 1 row and 1501 column, with values [1 -1 1 -1 1 -1.... etc
One way: x = ones(1,1501); x(2:2:end) = -1*x(2:2:end); Another way y = repmat([1 -1],1,751); y(end) = [];

environ 14 ans il y a | 1

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Calculate the frequency range and plot the unwrapped phase spectrum
Honglei makes two good points in his comments. I'll assume you are talking about the distribution of the squared-magnitudes ...

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kmeans
You do the same thing except: plot(X(idx==1,1),X(idx==1,2),'r.','MarkerSize',10); hold on plot(X(idx==2,1),X(id...

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How do I Regression Fit a SinWave to a dataset?
You need to know what periods you want to fit. You had another post where you talked about fitting city population for a period ...

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what the right function ?
It looks to me like this function is ok. I mean you don't need the semicolons after the ends, but ok fine. Did you save this...

environ 14 ans il y a | 0

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Small Problem with 'if' statement and array index
This is a matrix as the first element of a cell array? If so (and if by line you mean row), then you want to address that by ...

environ 14 ans il y a | 0

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Writing data into an array
Can you be more specific what you mean by store? Images in MATLAB are naturally matrices, either 2-D matrices, or 3-D for someth...

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Autocorrelation function of sin(ωt) -- XCORR complications
To address your first question, the x-axis does not go up to 2000 seconds. What you have to keep in mind is that the autocorrela...

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sub2ind error
Your x and y vectors are not suitable for sub2ind(). You have an x vector that starts at 0 which is not a valid linear index in ...

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Fundamental Frequency
Yes,collect the F0 estimates in a vector and create a vector of times of equal length. Then just, plot(t,F0) However, y...

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How to use "zeros" to replace for loop?
frame1 = zeros(303,381,3);

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remove index
x = [10 2 3 5 15 7 8 100 2 10 12 23 20]; x(3:3:end) = [];

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Eigenvectors of a nonsymmetric matrix.
Below W are the left eigenvectors, use the one associate with the largest eigenvalue. If A is your matrix [W,D] = eig(A...

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Error- Subscript indices must either be real positive integers or logicals.
A couple things: 1.) Is this an RGB image? The 3-D wavelet transform is not suitable for an RGB image. The 3-D wavelet transf...

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plot grid
Are you sure you want to do that? You won't be able to see the xticklabels even if you make the font really small. Here is an...

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