Re: Re: Package File for Different Mathematica Versions

*To*: mathgroup at smc.vnet.net*Subject*: [mg90002] Re: [mg89976] Re: Package File for Different Mathematica Versions*From*: Murray Eisenberg <murray at math.umass.edu>*Date*: Thu, 26 Jun 2008 04:41:54 -0400 (EDT)*Organization*: Mathematics & Statistics, Univ. of Mass./Amherst*References*: <200806251030.GAA18948@smc.vnet.net>*Reply-to*: murray at math.umass.edu

And you might make the handling of the conditional simpler by organizing things like this: myfunc5[x_]:= x^2; myfunc6[x_]:= 2x; myfunc[x_]:=If[$VersionNumber>=6, myfunc5[x],myfunc6[x]] That way, you can keep what's inside the If expression much shorter and therefore easier to maintain. Bill Rowe wrote: > 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. > -- 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

**References**:**Re: Package File for Different Mathematica Versions***From:*Bill Rowe <readnews@sbcglobal.net>