Matlab

how to calculate area of a grayscale image?
how to calculate area of a grayscale image? ... 5 Jun 2010 09:13

Free Project Management Software
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Matrix operations
Hi all, Anybody could give me a hand? given A = [a1,a2,a3,a4,a5] how can i create a matrix of [a2-a1,a3-a2, a4-a3...]/ Thanks ... 5 Jun 2010 01:42

quasi-newton method
Hi Dears, I want to use the quasi_newton m file for optimizing a multivarite function but I don't know how the inputs should be? I would be thankful If you tell me by an example. Parviz ... 5 Jun 2010 00:37

How to use cellfun or arrayfun to do this operation?
Dear all Suppose there are 9 figures and a 9x3 array (each row is a color information), I hope each row can be set to the corresponding figure's backgroundcolor. Can I use cellfun or arryfun to get that? mayi ... 5 Jun 2010 00:37

How to calculate a image's PSF by matlab?
Hi, all I want to get the PSF of an image ,but I don't know how to do it. And, can somebody tell me what is the logarithmic image gradient density? How to get this curve? Please help me. Thanks. ... 6 Jun 2010 23:51

Figures don't preserve size on export
Hi; I'm new to Matlab. I'm trying to work out how to export figures, and I'm having trouble with their sizes. I'm using plot commands like x = 1:0.1:100; plot( sin(x) ) % resizing commands print -depsc 'matlab.eps' The resizing commands I've been trying to use are set( gcf, 'Units', 'inches', 'Position', ... 7 Jun 2010 14:17

using the name of a variable as string
Hi, I want to use the name of a variable as a string (for example as xlabel of a plot). How do I do that?. I kind of what to achieve this: x = [1 2 3] plot(x) xlabel('x') without using the explicit name of the variable in the last line (assume I loop over many variables and I do not the name). Thank you for the... 5 Jun 2010 07:03

sparse matrix creation
I have this algorithm, k=sparse(num1,num2) k(5,5)=20; ..... for i=1:num1 fog j=1:num2 k(i,j)=k(i,j)+val; end end I want to speeed up things so, i just use the indexing of the matrix like tmp1=1; for i=1:num1 fog j=1:num2 index(tmp1)=i; index(tmp1)=j; val(tmp1)=val end end if i use k=sparse(... 7 Jun 2010 10:45

Help test tomorrow in the MATLAB
Explain the Short time Fourier Transform (STFT) and its applications .Also write a Matlab code to perform STFT thanksss ... 4 Jun 2010 23:32