Re: Working in Modules

• To: mathgroup at smc.vnet.net
• Subject: [mg15878] Re: Working in Modules
• From: dreissBLOOP at bloop.earthlink.net (David Reiss)
• Date: Wed, 17 Feb 1999 23:33:32 -0500
• Organization: EarthLink Network, Inc.
• References: <7a2c0d\$1ul@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```In article <7a2c0d\$1ul at smc.vnet.net>, phrje at mimosa.csv.warwick.ac.uk (Dr D
McK Paul) wrote:

> This is my third attempt to post this question. No idea why it doesnt
> work. I'm not an expert in Mathematica and would appreciate comments on
> why init1 returns a list with all zeros replaced by -1, but init does
> not. Its probably very simple but its confused me.
>
> Don
>
> init[n_Integer]:=Module[
>                     {s=Table[Random[Integer],{n n}]},
>                     s/.{0->-1};
>                     Partition[s,n]
>                     ]
>
> init1[n_Integer]:=Module[
>                     {s=Table[Random[Integer],{n n}]},
>                     s/.{0->-1}
>                     ]
>
>
> --
>
> Prof. Don McKenzie Paul               tel.  (1203) 523603 Department of
> Physics                 fax.  (1203) 692016 University of Warwick
> email  phrje at csv.warwick.ac.uk COVENTRY CV4 7AL
> UK
> --
> ******************************************************
> Professor Don McKenzie Paul
> Department of Physics
> University of Warwick

In the case of init the command s/.{0->-1};  replaces the
0's in s by -1's but does not change s.  Thus, when
Partition[s,n] is called, it returns a value based on the
unchanged s.

This would work:

init[n_Integer]:=Module[
{s=Table[Random[Integer],{n n}], s1},
s1=s/.{0->-1};
Partition[s1,n]
]

--David
with no substitutions for

--

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