Re: Re: newbie question on functions

• To: mathgroup at smc.vnet.net
• Subject: [mg51822] Re: [mg51794] Re: newbie question on functions
• From: Bob Hanlon <hanlonr at cox.net>
• Date: Wed, 3 Nov 2004 01:23:45 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

```AppendTo and PrependTo do change their original lists

alpha = {a,b,c};

AppendTo[alpha, d];

alpha

{a, b, c, d}

PrependTo[alpha, a];

alpha

{a, a, b, c, d}

Bob Hanlon

>
> From: AES/newspost <siegman at stanford.edu>
To: mathgroup at smc.vnet.net
> Date: 2004/11/02 Tue AM 02:05:23 EST
> To: mathgroup at smc.vnet.net
> Subject: [mg51822] [mg51794] Re: newbie question on  functions
>
> In article <cm4r7j\$6lm\$1 at smc.vnet.net>,
>  David Bailey <dave at Remove_Thisdbailey.co.uk> wrote:
>
> > Yes, of course you can save the result of a calculation. For example:
> >
> > result=intensity[4.,5.]
>
>
> For the original "newbie" poster:
>
> For newbies, or less expert users like me, it's easy to think that
> something like
>
>     AppendTo[list, expr]
>
> is a "command" that will do what it says: append expr to list.  Takes a
> few bad experiences to realize that you actually have to say
>
>     list = AppendTo[list,expr]
>
> Same general principle applies more broadly.
>
>

Bob Hanlon
Chantilly, VA

```

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