CODEWITHSUNDEEP
matlabvector
Elcio Silveira
Elcio Silveira

Reputation: 25

How to obtain a random vector in MatLab?

I need obtain a vector with n numbers disposed in random order in MatLab. How can I do it?

If I use, for example, randi(10,1,10), I will obtain random values, but I have no garantee that all the numbers will be in the sequence.

For example:

I need a vector with all the numbers 1,2,3,4,5,6,7,8,9,10, disposed in a random order, like in 2,5,3,6,8,10,4,7,9,1.

Upvotes: 0

Views: 133

Answers (1)

Mad Physicist
Mad Physicist

Reputation: 114230

It appears that you are looking for the randperm function. From the docs:

p = randperm(n) returns a row vector containing a random permutation of the integers from 1 to n inclusive.

Your example would be randperm(10).

There is an optional second argument that you could pass in to determine how many elements will be chosen. For example, randperm(10, 5) would choose five random numbers from 1 to 10.

You can also use the results of randperm to shuffle or select from an arbitrary vector. Say you wanted the numbers 101 to 110 in random order instead of 1 to 10:

nums = 101:110;
nums = nums(randperm(numel(nums)));

Upvotes: 1

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