Re: Package File for Different Mathematica Versions

*To*: mathgroup at smc.vnet.net*Subject*: [mg89976] Re: Package File for Different Mathematica Versions*From*: Bill Rowe <readnews at sbcglobal.net>*Date*: Wed, 25 Jun 2008 06:30:24 -0400 (EDT)

On 6/24/08 at 3:29 AM, acbev at lanl.gov (Andrew Beveridge) wrote: >I am writing a package file for Mathematica. I have two versions of >Mathematica targeted: 5.2 and 6.0.x. >It would be nice to use some of the improvements in Version 6.0.x >without losing backwards compatibility with Version 5.2. >I imagine one way to implement this would be the following: >If $VersionNumber >= 6 then ... else ... >However, I would prefer not to put a bunch of If statements into my >code; multiple lines would have to be modified. Is there are more >elegant way around this problem? Can a function be defined for a >particular versions of Mathematica in a package file? Yes, a function can be defined for a particular version of Mathematica. You could have a construct like If[$VersionNumber >=6, myfunc[x_]:=x^2, myfunc[x_]:=2 x]; That is you can put the definitions for functions inside an If construct. And if you all the code for version 5 separate from all of the code for version 6, you should be able use one If construct. In essence what you are doing is making your function definitions for version 5 part of a compound expression and function definitions for version 6 part of another compound expression. Then the If construct determines which compound expression is evaluated which ensures the correct definitions are used. For awhile, I was using this type of construct in my init.m file so that I could keep both versions 5 and 6 running with the same init.m file quite successfully. I've since edited this out since I no longer use version 5.x.

**Follow-Ups**:**Re: Re: Package File for Different Mathematica Versions***From:*Murray Eisenberg <murray@math.umass.edu>