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Re: Begginer's question: Saving a function for later use
*To*: mathgroup at smc.vnet.net
*Subject*: [mg128049] Re: Begginer's question: Saving a function for later use
*From*: Murray Eisenberg <murray at math.umass.edu>
*Date*: Tue, 11 Sep 2012 02:34:29 -0400 (EDT)
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*References*: <20120910080540.BEE556843@smc.vnet.net>
Mathematica's memory of a definition lasts as long as, and only as long
as, a given Mathematica session.
You typed that definition into a notebook (with title probably
Untitled-1, unless you already saved it with another name).
As long as Mathematica is still open, even if you close a notebook where
you made a definition such as your "test", that definition is still
available at the same session -- until you quit Mathematica.
When you start Mathematica again, you must open that notebook and
evaluate the cell containing your definition.
Or, if you put the definition into a .m package and save that, then you
must load that package into Mathematica in order to recreate the
definition.
(There are methods to have such a package automatically loaded each time
you start Mathematica, but that's getting into something more advanced.)
On Sep 10, 2012, at 4:05 AM, pedro.roberto at campus.ul.pt wrote:
> Hello,
> I'm just getting started on Mathematica and trying to define a
function for later use. The function is just:
>
> test[x_]:=x^2
>
> While I don't close mathematica, I can use the function on my
notebooks but when I close it, the function disappers, I tried to save a
.m file with it but It didn't work. What do I do?
>
> Thanks for time,
> Pedro
---
Murray Eisenberg
murray at math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower phone 413 549-1020 (H)
University of Massachusetts 413 545-2859 (W)
710 North Pleasant Street fax 413 545-1801
Amherst, MA 01003-9305
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