Matlab

DTFT : What is this code doing
When it comes to Fourier transform ! I always compare my codes with other and try to learn from them ; Here is some thing which i didnt get it function X = dtft1(x, omega, n_shift) %function X = dtft1(x, omega, n_shift) % Compute DTFT of 1D signal x at frequency locations wx % In % x [N,ncol] signal values %... 7 Jul 2010 00:24

Multiplying very large very sparse square symmetric matrix with column
I am looking a good way to multply a large matrix 10,000,000 x 10,000,000 with a column. The matrix is square, symmetric, real with only 8 non zero values per row. This operation runs many times. Multi-core approaches are wellcome Approaches that really understand that only few multiplications are required due... 6 Jul 2010 17:48

Fill with custom random
I'm trying to do the following: t = zeros(500,500); f = [345,234,64,4356, ... (list of points to change) for i = f t[i]=customrandomfunc() end this takes a very long time, is there a way to speed this up? I'd like something like: t[f] = customrandomfunc() except I want each point to have a different va... 7 Jul 2010 10:08

Image compare
Hi everyone, I need a free tool (or functions) to measure the similarity between two images..Anyone can tell me about it? Cheers ... 7 Jul 2010 13:27

photomosaic
Hello! Sorry if I haven't write you before, but I was very busy.. Now I have the program for my goal! 4 m.file: -creaDBsave (for make the database); -matchingS for the mechanism to make the best match for images/tile) -creaMosaicoS (principal program) ------------------------ creaDBsave ------------------... 6 Jul 2010 17:47

Tree data structure in MatLab
Derek's answer is the right one for Matlab, it may be strange for someone with a different background (eg. C++, Java) but the only way to deal with this sort of data structures is to re-interpret them in terms of vectors or matrices. Sometimes it's not obvious how to do so, and the result is very inefficient and hard t... 6 Jul 2010 17:47

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Simple question about listeners
This is probably not what you want to hear, but you can replace the listeners with cell arrays of function pointers. It's very simple to implement and worked well for me. Of course, if you're already knee-deep in ML events in your particular system, it may be an unacceptable change; but I wouldn't want to debug a compl... 6 Jul 2010 17:47

sound threshold
Hi, I want to compute a threshold of some speech sound segments but I do not know how, can someone advise me to some solution? Thanks, Lama ... 6 Jul 2010 17:47

mcc returns '??? Error executing mcc, return status = 1.'
When I run mcc -v -m myfile on my Vista system I get: ??? Error executing mcc, return status = 1. without any additional explanation. Is there any way to get more information about the potential source of the problem? Fact is that the same file used to compile just fine recently. All I did was to make a few min... 6 Jul 2010 16:41