MATLAB Central Newsreader - Uniform distribution

Uniform distribution

Jason — Thu, 17 Apr 2008 08:56:01 -0400

Hello,

I am currently doing some stats in MATLAB.

I've been using

R = normrnd(mean,sigma,[100 1])

to generate 100 random numbers from a normal distribution
with "mean" and standard deviation "sigma".

I now want to do the same for a uniform distribution.

Is is the case that

R = unifrnd(A.B, [100 1])

is what I should use. Are A and B are the lower and upper
ranges. The help isn't to specific but I'm assuming this is
the case.

Thanks

Re: Uniform distribution

helper — Thu, 17 Apr 2008 09:25:05 -0400

"Jason " <j_henderson44@REMOVEhotmail.com> wrote in message
<fu73b1$gc9$1@fred.mathworks.com>...
> Hello,
>
> I am currently doing some stats in MATLAB.
>
> I've been using
>
> R = normrnd(mean,sigma,[100 1])
>
> to generate 100 random numbers from a normal distribution
> with "mean" and standard deviation "sigma".
>
> I now want to do the same for a uniform distribution.
>
> Is is the case that
>
> R = unifrnd(A.B, [100 1])
>
> is what I should use. Are A and B are the lower and upper
> ranges. The help isn't to specific but I'm assuming this
is
> the case.
>
> Thanks

I agree that the documentation for this function isn't too
specific. One good thing about MATLAB is the fact that you
can open and read many of the functions. If you check out
the code for UNIFRND, you will see it is simply a
fanicified wrapper for the operation:

R = A + (B-A)*rand(m)

where A and B are your lower and upper bounds and m is a 1-
by-2 matrix of sizes [nRows nCols].

Re: Uniform distribution

Jason — Thu, 17 Apr 2008 12:27:01 -0400

"helper " <spamless@nospam.com> wrote in message
<fu751h$qq2$1@fred.mathworks.com>...
> "Jason " <j_henderson44@REMOVEhotmail.com> wrote in message
> <fu73b1$gc9$1@fred.mathworks.com>...
> > Hello,
> >
> > I am currently doing some stats in MATLAB.
> >
> > I've been using
> >
> > R = normrnd(mean,sigma,[100 1])
> >
> > to generate 100 random numbers from a normal distribution
> > with "mean" and standard deviation "sigma".
> >
> > I now want to do the same for a uniform distribution.
> >
> > Is is the case that
> >
> > R = unifrnd(A.B, [100 1])
> >
> > is what I should use. Are A and B are the lower and upper
> > ranges. The help isn't to specific but I'm assuming this
> is
> > the case.
> >
> > Thanks
>
>
> I agree that the documentation for this function isn't too
> specific. One good thing about MATLAB is the fact that you
> can open and read many of the functions. If you check out
> the code for UNIFRND, you will see it is simply a
> fanicified wrapper for the operation:
>
> R = A + (B-A)*rand(m)
>
> where A and B are your lower and upper bounds and m is a 1-
> by-2 matrix of sizes [nRows nCols].
>
>

Many thanks. I ended up plotting it to check. I wasn't aware
I could open the code to check it. How would I do this?

Thanks.

Re: Uniform distribution

Jason — Thu, 17 Apr 2008 12:42:02 -0400

"Jason " <j_henderson44@REMOVEhotmail.com> wrote in message
>
> Many thanks. I ended up plotting it to check. I wasn't aware
> I could open the code to check it. How would I do this?
>
> Thanks.

Oops forget that. Fairly obvious. Thanks for suggestion.