Re: Mathematica question

*To*: mathgroup at smc.vnet.net*Subject*: [mg124812] Re: Mathematica question*From*: DrMajorBob <btreat1 at austin.rr.com>*Date*: Wed, 8 Feb 2012 05:28:02 -0500 (EST)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*References*: <201202060739.CAA10233@smc.vnet.net>*Reply-to*: drmajorbob at yahoo.com

It's the sort of grammar up with which we should not put! Bobby On Tue, 07 Feb 2012 03:06:37 -0600, Murray Eisenberg <murray at math.umass.edu> wrote: > Yikes: it seems to me that's exactly the sort of expression combining > Postfix with the /@ special input form and pure functions that one > should _not_ write! > > The principal purpose of such special input forms should be to make > expressions easier to read (and write), not more. > > On 2/6/12 2:39 AM, Howie wrote: >> Let's say you've got an expression >> >> expr = {Sin[x] + x^2 - x^2*Cos[x], x^3 (1 + x^2) - x^3, x^4 - x^3} >> >> What does this mean? >> >> Table[expr[[j]] // FullSimplify[#, $assumptions]& /@ #& // Expand // >> @ #&, {j, 3}] >> >> I am new to Mathematica as far as these more complicated expressions >> are concerned. >> >> Can you explain symbol by symbol? >> >> I realize that the [[j]] is Part and that FullSimplify is applied // >> Postfix to expr, but I don't understand what $assumptions means (I'm >> assuming that these are some assumptions added to FullSimplify) but I >> do not know where these assumptions come from. Are these assumptions >> the rest of the stuff on the right-hand side? >> >> In reality I have a potentially much more complicated form of the >> expr. >> >> Thanks! >> >> > -- DrMajorBob at yahoo.com

**References**:**Mathematica question***From:*Howie <hcohl001@gmail.com>