Re: populate a list with random numbers from normal distribution?
- To: mathgroup at smc.vnet.net
- Subject: [mg49908] Re: populate a list with random numbers from normal distribution?
- From: "Dr. Wolfgang Hintze" <weh at snafu.de>
- Date: Fri, 6 Aug 2004 03:09:27 -0400 (EDT)
- References: <ceqtu1$jvr$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Sean,
there seems to be a slight misunderstanding in the usage of Continuous
Distributions (see Help Brwoser for details and examples).
Here is how it works fine:
In[1]:=
Needs["Statistics`ContinuousDistributions`"]
Assign normal distribution to l1
In[2]:=
l1 = NormalDistribution[50000, 25000];
Caculate main parameters
In[3]:=
Variance[l1] // N
StandardDeviation[l1] // N
Out[3]=
\!\(6.25`*^8\)
Out[4]=
25000.
Create list of 1000 random values from that distribution l1
In[5]:=
ra = RandomArray[l1, 1000];
Check graphically
In[6]:=
ListPlot[ra];
Hope this helps.
Regards,
Wolfgang
sean kim wrote:
> hello group.
>
> I looked at the help browser but i can't figure this out. I weant to
> make a list of random numbers sampled from a normal distribution
>
> In[90]:= Needs["Statistics`ContinuousDistributions`"]
>
> l1 = Table[Random[NormalDistribution[50000,25000], Integer, {10000,
> 99999}], {1000}];
>
> Variance[l1]//N
> StandardDeviation[l1]//N
>
>
> From In[90]:=
> Random::"randt":
> Type specification NormalDistribution[50000, 25000] in
> <<1>> should be Real, Integer, or Complex.
>
> Out[92]=
> 0.
> Out[93]=
> 0.
>
> thanks in advance for any insights
>
> sean
>
>