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Re: Fuction definition

• To: mathgroup at smc.vnet.net
• Subject: [mg73683] Re: [mg73635] Fuction definition
• From: János <janos.lobb at yale.edu>
• Date: Sat, 24 Feb 2007 02:24:41 -0500 (EST)
• References: <200702230942.EAA17911@smc.vnet.net>

On Feb 23, 2007, at 4:42 AM, bar at ANTYSPAM.ap.krakow.pl wrote:

> Hi
>
> When I try :
> ------------------
> p = 1;
> f1[x_] := p Sin[Pi x];
> p = 2;
> f2[x_] := p Sin[Pi x];
>
> f1[0.5]
> f2[0.5]
>
> Out[26]=2.
>
> Out[27]=2.
> -----------------
> When I use = instead of := it works OK.
> Why ?
>
> It is safely to use "=" in function definition ?
>
> I have to integrate and differentiate such function in the future.
> In my case function depends on about 20 parameters, which are 
> calculated
> three times, (I want to obtain three functions)
>
> I'm not sure is this good idea to use '=' ?
>
> Regards , Olaf
>
>

As a newbie I guess that:

  := says to the function:  "My dear, do not worry, I will kiss you =

after we walk out when the dance is called"

= says to the function:  "My dear, do not worry, I kiss you right 
now, and we walk out when the dance is called"

J=E1nos


------------------------------------------
"The shortest route between two points is the middleman"  Ayn Rand

• References:
  • Fuction definition
    • From: bar@ANTYSPAM.ap.krakow.pl