generating random numbers from a range

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Meh
Meh 2012-6-13
Hello, I want to generate random numbers from a range. Example I want 1000 random numbers in the range from 1000 to 3000. How can I do this in matlab, because what I could get using the rand command is only in the range [0,1]. Thanks!
Edit Nr. 1 I think the rand command gives UNIFORMLY distributed random numbers. Is there a way to generate samples from NORMALLY distributed functions ( randn command), but instead of mean and std, I want to enter initial value and ranges. I want this for a stochastic modelling (sensitivity analysis) purpose.

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回答（2 个）

Andrei Bobrov
Andrei Bobrov 2012-6-13
please read about function rand
out = 1000 + 2000*rand(1000,1);
OR
use function unifrnd from Statistics Toolbox
out = unifrnd(1000,3000,1000,1);
  2 个评论
Meh
Meh 2012-6-13
Thanks andrei that was the answer for my previous question. Now I want to ask one more question. I think the rand command gives UNIFORMLY distributed random numbers. Is there a way to generate samples from NORMALLY distributed functions (randn command), but instead of mean and std, I want to enter initial value and ranges. I want this for a stochastic modelling (sensitivity analysis) purpose.
Andrei Bobrov
Andrei Bobrov 2012-6-13
k = randn(1000,1);
km = min(k);
out = (k-km)/(max(k)-km)*2000+1000;
hist(kn,1000:100:3000)
But this is distribution - not normal distribution

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Walter Roberson
Walter Roberson 2012-6-13
Normal distribution is, by definition, infinite tail on both sides. If you want your generated values to be confined to a finite range, you do not have a normal distribution.
Perhaps you want a beta distribution.

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