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Re: Create Permanent Self Defined Function?

• To: mathgroup at smc.vnet.net
• Subject: [mg54150] Re: Create Permanent Self Defined Function?
• From: Curt Fischer <tentrillion at gmail.NOSPAM.com>
• Date: Sat, 12 Feb 2005 01:56:57 -0500 (EST)
• References: <cuhr6m$97t$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Mary Beth Mulcahy wrote:
> Basically, I would like to create a new "built in" function that can be stored
> in my Mathematica and used for future sessions like, for example, BesselJ[n,
> z] or the Exp[] functions are.  I am doing this because I am playing around
> with the OriginLab link and it would be much easier if I could just call a
> function up while in Origin instead of typing it into the Mathematica
> interface box.  I definitely can do it, but it would be slick to be able to
> just call it up, even in Mathematica so that I didn't have to cut and paste
> all the time.

Mary Beth,

One way to do this is to add the function definition to your init.m file 
, the location of which depends on your OS.  On Windows XP with 
Mathematica 5.0.1 for Students, I opened up
C:\Program Files\Wolfram 
Research\Mathematica\5.0\Configuration\Kernel\init.m
with any decent text editor and appended the line
marybethEG[x_]:=x+1
to the file.

The kernel automatically loads the contents of that file so you can do

In[1]:=
marybethEG[7]

Out[1]=
8

-- 
Curt Fischer