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MathGroup Archive 2005

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Re: basic issue with do and :=

  • To: mathgroup at smc.vnet.net
  • Subject: [mg60423] Re: [mg60402] basic issue with do and :=
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Fri, 16 Sep 2005 03:49:03 -0400 (EDT)
  • Reply-to: hanlonr at cox.net
  • Sender: owner-wri-mathgroup at wolfram.com

Clear[a, b];

a[i_] := i;

b[i_] := a[i] + 1;

b[1000]

1001


Bob Hanlon

> 
> From: "David" <isolanoster at gmail.com>
To: mathgroup at smc.vnet.net
> Date: 2005/09/15 Thu AM 05:16:22 EDT
> Subject: [mg60423] [mg60402] basic issue with do and :=
> 
> Hi all,
> 
> this works as (I) expected
> 
> -------------------------
> Do[a[i] = i, {i, 10}]
> Do[b[i] =a[i]+1, {i, 10}]
> -------------------------
> 
> While this doesn't:
> 
> --------------------------
> Do[a[i] = i, {i, 10}]
> Do[b[i] :=a[i]+1, {i, 10}]
> ---------------------------
> 
> [note ":=" instead of "=" on the second line].
> 
> namely the output is: "b[2]:=a[i]+1" for all i
> 
> 
> 
> Is there any compact way to define: "b[i] :=a[i]+1" for all i ?
> 
> 
> Thank you in advance,
> 
> David
> 
> 


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