Re: Re: Programming style: postfix/prefix vs. functional
- To: mathgroup at smc.vnet.net
- Subject: [mg70661] Re: [mg70633] Re: [mg70587] Programming style: postfix/prefix vs. functional
- From: Murray Eisenberg <murray at math.umass.edu>
- Date: Sun, 22 Oct 2006 01:20:13 -0400 (EDT)
- Organization: Mathematics & Statistics, Univ. of Mass./Amherst
- References: <200610200921.FAA11092@smc.vnet.net> <200610210914.FAA29189@smc.vnet.net>
- Reply-to: murray at math.umass.edu
@ is an abbreviation for Composition: Composition[f, g][expr] f[g[expr]] f@g[expr] f[g[expr]] But this one is a bit difficult to discover from the documentation. If you know the term "Composition", then of course you can do the reverse look-up in the Help Browser. Unfortunately, if you try the Help Browser directly for "@", even using the Master Index tab, you won't find it! Moreover, if you try the default Built-in Functions tab you search for @, you'll be taken to the entry for Apply (@@). So this is definitely a gap in the documentation indexing. Chris Chiasson wrote: > One thing I have wondered is, what function corresponds to the short > hand "@". I know @ appears in Operate. Also, the ? can sometimes tell > what function an operator represents (try ?/@ ) , but ?@ only gives > System`$ (the symbol $ in the context System). > > > On 10/20/06, Will Robertson <wspr81 at gmail.com> wrote: >> Hello, >> >> As a newcomer to Mathematica, I'm a little unsure on what "good style" >> would be in this programming language. I notice that several functions >> have prefix and postfix notations such as //. for ReplaceRepeated, /@ >> for Map, and so on. >> >> Clearly using these forms makes the code more compact, but sacrifices >> some level of readability. Are there guidelines or suggestions that >> have built up over the years of whether these are "good" or "bad" to >> use? >> >> If it's simply personal preference, what do you like to use? >> -- >> Many thanks, >> Will Robertson >> >> > > -- 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:
- Programming style: postfix/prefix vs. functional
- From: "Will Robertson" <wspr81@gmail.com>
- Re: Programming style: postfix/prefix vs. functional
- From: "Chris Chiasson" <chris@chiasson.name>
- Programming style: postfix/prefix vs. functional