# How to create random vectors of the same lengths?

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Mark 2012년 6월 12일
I am trying to get a random vector (2D) of the same length, say 'x'.
I thought about creating a list of numbers -1 to 1 for x values and then another one for from 1 to -1 for y values, and then randomly picking two numbers from the list, but this would give me vectors of all lengths and I don't know how to normalize them. I had all sorts of other ideas but none of them seem to be of much use.
Absolutely any help is greatly appreciated!
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Mark 2012년 6월 12일
This is where I am now at, for 200 numbers between -1 and +1
>> N=200;
>> min=-1;
>> max=+1;
>> range=max-min;
>> a=range*rand(N,2).*sign(rand(N,2))-range/2;

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### 채택된 답변

Kevin Holst 2012년 6월 12일
from the documentation: Examples
Generate values from the uniform distribution on the interval [a, b].
r = a + (b-a).*rand(100,1);
in your case you'd want:
a = min + (max-min).*rand(N,2);

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