how to generate numbers randomly

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....

Answer 1

[Andrew Newell]

You can use rand to generate random numbers.

[lucky yeggina]

thnq., i did use rand(n) instead of rand.,

thanq so much

Answer 2

[lucky yeggina]

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?

[Andrew Newell]

This should be a comment, not an Answer. What do you mean by "access"? MATLAB does lots of things with zeros.

Answer 3

[Walter Roberson]

Are you trying to generate a random index in to an vector? If so, then

VectorIndices = ceil(length(TheVector) * rand(1,n));

Answer 4

[Matt Tearle]

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);