how to generate numbers randomly

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lucky yeggina
lucky yeggina 2011-3-6
i'm currently working on a project "Generation of varaiable SLL & variable beamwidth beams using GENETIC ALGORITHM using amplitude variation." here i need to generate amplitudes(excitations ) randomly. so., hw can i generate amplitudes randomly.
thanq in advance....

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Andrew Newell
Andrew Newell 2011-3-6
You can use rand to generate random numbers.

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lucky yeggina
lucky yeggina 2011-3-6
aah well but., rand generates array of numbers like rand(n) gives nxn matrix of elements btw o and 1 but MATLAB doesnt access array elemnts wid 0 ri8?
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Andrew Newell
Andrew Newell 2011-3-6
This should be a comment, not an Answer. What do you mean by "access"? MATLAB does lots of things with zeros.

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Walter Roberson
Walter Roberson 2011-3-6
Are you trying to generate a random index in to an vector? If so, then
VectorIndices = ceil(length(TheVector) * rand(1,n));
Matt Tearle
Matt Tearle 2011-3-6
If you want indices, use randi to generate integers from 1 to n
idx = randi(length(x),7,1)
random7 = x(idx)
This samples with replacement. To shuffle an array use randperm
idx = randperm(length(x));
shufflex = x(idx);

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