Re: SortBy won't order irrationals

*To*: mathgroup at smc.vnet.net*Subject*: [mg124102] Re: [mg124028] SortBy won't order irrationals*From*: Christopher Young <cy56 at comcast.net>*Date*: Mon, 9 Jan 2012 03:16:07 -0500 (EST)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*References*: <201201060916.EAA26862@smc.vnet.net> <AE02F0F7-A101-45CD-B304-A19626EBAE43@mimuw.edu.pl>

OK, but that's not the behavior I'd expect, and it's something that has to be watched out for constantly. For example, if we use SortBy, I think that after all the functions have been applied to the list, we're stuck with this sorting by complexity of expression unless we remember to apply N to every element of the list together with each of our other functions. On Jan 6, 2012, at 5:46 PM, Andrzej Kozlowski wrote: > Numeric symbols like Sqrt[2],Pi,E etc. etc are not sorted by their value but in the same way as all other symbols. Compare: > > Sort[{Pi, 4, Sqrt[2], 2, 3*E}] > > {2, 4, Sqrt[2], 3*E, Pi} > > with > > Sort[{Pi, 4, Sqrt[2], 2, 3*E}, Less] > > {Sqrt[2], 2, Pi, 4, 3*E} > > > Note also that you can use Sort with a custom ordering function. > > > Andrzej Kozlowski

**References**:**SortBy won't order irrationals***From:*Chris Young <cy56@comcast.net>