How do I randomly select in MATLAB?

Question

I wanna randomly select 1 by 6 matrix elements between -1 and 1.

For example, [-1 1 -1 1 1 1]

How do I select it??

It says it all here mathworks.com/help/stats/random.html

Csak Zoli
– Csak Zoli

2012-10-27 19:23:36 +00:00
Commented Oct 27, 2012 at 19:23 — Csak Zoli
– Csak Zoli, Commented Oct 27, 2012 at 19:23

tmpearce · Accepted Answer · 2012-10-27 19:26:37Z

2

Create a vector of possible values, and use randi to generate random indices into that vector.

Choices = [-1 1];
Index = randi(length(Choices), 1, 6);
Choices(Index)
ans =

     1     1     1    -1     1    -1

answered Oct 27, 2012 at 19:26

tmpearce

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2 Comments

tmpearce Over a year ago

Read up on random numbers in matlab; you'll need to seed the random number generator if you need it to be different every time you start up the program.

Colin T Bowers Over a year ago

+1! I have always used a combination of round and rand for this type of thing in the past, but this is much better!

Rody Oldenhuis · Accepted Answer · 2012-10-28 05:48:18Z

0

Just for the sake of completeness:

randVec = 2*randi([0 1], 1,6) - 1;

answered Oct 28, 2012 at 5:48

Rody Oldenhuis

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