Re: Re: More /.{I->-1} craziness

*To*: mathgroup at smc.vnet.net*Subject*: [mg106095] Re: [mg106048] Re: More /.{I->-1} craziness*From*: Murray Eisenberg <murray at math.umass.edu>*Date*: Fri, 1 Jan 2010 05:35:49 -0500 (EST)*Organization*: Mathematics & Statistics, Univ. of Mass./Amherst*References*: <hhf5s3$h4o$1@smc.vnet.net> <200912310816.DAA24798@smc.vnet.net>*Reply-to*: murray at math.umass.edu

OK, so what, in an earlier post today, I suggested needed to be said in the docs is said there, although not in quite so direct a form ("What you see is not what is acted upon", as stated by Alexander Elkins). The issue, it seems, is how and when one finds such principles in the docs. Presumably the Virtual Book that's part of the Documentation Center would readily lead one to that tutorial. And it's there, to be sure -- but not so easy to find: Core Language > Patterns > Patterns for some Common Types of Expressions Part of the difficulty in finding such things in the Documentation Center may be the granularity of the documentation (as contrasted with the now-defunct, printed "The Mathematica Book" -- if I may be permitted to beat a dead horse). Norbert P. wrote: > > ... as you can read in tutorial/ > PatternsForSomeCommonTypesOfExpression: > "Especially for some common kinds of expressions, the standard > output format used by Mathematica is not particularly close to the > full internal form. But it is the internal form that you must use in > setting up patterns. " -- 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