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Spectrogram will solve your problem(dont remember the function name in matlab), I have some files in case u r interested. Also, other Joint time frequency analysis tools which can be accessed at dsp.rice.edu would help too.

answer to ur second question: why not use a simple sorting alg like bubble sort or selection sort and get done with it, and ur array size seems to b really small and no optimization is needed.

for the above example u dont have a simple function. let me know if u would like to try with loops or vector approach, i can give u some hints

Thanks SomptingGuy

Thanks, I am also expecting someone to give me the forum link in MATHWORKS site, couldnot find it there!!!

are there any other Matlab forums? please let me know

you shouldnot worry if the different eigen vectors are linearly dependent. i.e., matlabR11 could be giving the solution as [1 2 1] and if matlabR12 gives as [0.5 1 0.5], they are still the same.

communications --- Proakis and Salehi Signal processing -- Proakis and Ingle

You have to break down the problem: What value constitutes a blacked out image (image ranges could be 0-255 or 0-1 or something else) instead if your problem is like finding number of entries in a matrix which are greater than a value x, then the answer would be: sum(A>=x) where x is the...

replace answer = x(i)+x(i+1) with answer(i) = x(i)+x(i+1) OR answer = x(1:end-1)+ x(2:end) which is the vector based approach as given by Mickey P