Re: Re: Why Sort[{"AX", "!D", "EX"}] -> {"AX", "!D", "EX"}

*To*: mathgroup at smc.vnet.net*Subject*: [mg76051] Re: [mg75994] Re: Why Sort[{"AX", "!D", "EX"}] -> {"AX", "!D", "EX"}*From*: Murray Eisenberg <murray at math.umass.edu>*Date*: Tue, 15 May 2007 04:59:45 -0400 (EDT)*Organization*: Mathematics & Statistics, Univ. of Mass./Amherst*References*: <f26nv5$4cl$1@smc.vnet.net> <200705140753.DAA23316@smc.vnet.net>*Reply-to*: murray at math.umass.edu

The docs cited DO seem to say how strings are ordered: "as they would be in a dictionary....". Is "!" a "mathematical operator" or is it just a character in the examples at issue? With dictionary ordering, the primary key for sorting would be the first character. So none of this explains the discrepant behavior between "!" as a single character and "!" as the first character of a string. Szabolcs wrote: > Philipp wrote: >> Would anybody explain to me the Mathematica (5.2) canonical order. >> Specifically, why >> >> In[]:= Sort[{"AX", "!D", "EX"}] >> Out[]= {"AX", "!D", "EX"} >> >> while, >> >> In[]:= Sort[{"A", "!", "E"}] >> Out[]= {"!", "A", "E"} >> >> Is this a bug??? >> >> Cheers, >> >> Philipp. >> >> > > http://documents.wolfram.com/mathematica/book/section-A.3.9 > > Most probably it has to do something with the "Mathematical operators > appear in order of decreasing precedence." part. > This behaviour is too consistent to be a bug (i.e. unintended > behaviour), but it is really confusing. The documentation only mentions > the ordering of single characters, but not how longer strings are > treated, and it seems that it doesn't work as most people would expect > it to. > -- 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: Why Sort[{"AX", "!D", "EX"}] -> {"AX", "!D", "EX"} ?***From:*Szabolcs <szhorvat@gmail.com>