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MathGroup Archive 2007

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Re: Normally Distributed Random Matrix

  • To: mathgroup at smc.vnet.net
  • Subject: [mg77579] Re: Normally Distributed Random Matrix
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Wed, 13 Jun 2007 07:33:19 -0400 (EDT)
  • Organization: The Open University, Milton Keynes, UK
  • References: <f4lb7t$g0e$1@smc.vnet.net>

amitsoni.1984 at gmail.com wrote:
> Hi,
> 
> I want to create a normally distributed random matrix in Mathematica.
> I'm using the following code in Mathematica 5.2:
> 
> ------------- code -----------------------------
> << Statistics`NormalDistribution`
> n = 500;
> A = RandomArray[NormalDistribution[], {n, n}]
> ------------------------------------------------
> 
> But it is not working even though it worked when I did it earlier on
> Linux. When I enter A it just gives:
> 
> ------------------------------------------------
> A
> RandomArray[NormalDistribution[], {500, 500}]
> ------------------------------------------------
> 
> Can anyone help me with this?
> 
> Thank you,
> Amit

It looks like the package has not been loaded correctly or that the 
definition is hidden for some reason. Having loaded the package, 
evaluate ?NormalDistribution : you must get a help message; otherwise 
something is wrong with the installed package. For instance,

In[1]:=
$Version
<< "Statistics`NormalDistribution`"
?NormalDistribution
n = 500;
Timing[A = RandomArray[NormalDistribution[], {n, n}]; ][[1]]
Dimensions[A]

Out[1]=
5.2 for Microsoft Windows (June 20, 2005)

NormalDistribution[mu, sigma] represents the normal (Gaussian) 
distribution with mean mu and standard deviation sigma.

Out[5]=
0.219 Second

Out[6]=
{500,500}

Regards,
Jean-Marc


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