Re: Quit versus Clear["Global`*"]

*To*: mathgroup at smc.vnet.net*Subject*: [mg121255] Re: Quit versus Clear["Global`*"]*From*: DrMajorBob <btreat1 at austin.rr.com>*Date*: Tue, 6 Sep 2011 03:57:45 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*References*: <201109042206.SAA21533@smc.vnet.net>*Reply-to*: drmajorbob at yahoo.com

Quit appears to quit as soon as it is parsed, regardless of arguments... yet another poster found that, if it is the first line in a cell with other statements, Mathematica doesn't quit until those other statements are done, hence wiping out their effect. Quit[e] the conundrum. Bobby On Mon, 05 Sep 2011 13:15:07 -0500, Andrzej Kozlowski <akoz at mimuw.edu.pl> wrote: > Well, I see it differently. All Mathematica functions have the form > Head[arguments] where the number of arguments could be 0. Quit is > therefore a Mathematica function, like Print[], Return[]. In fact, > Quit[n] where n is an integer also works "passing the integer n as an > exit code to the operating system" whatever that means. On the other > hand, expressions of the form Abracadabra are normally just symbols and > normally they do not perform any actions. In fact, do you know of any > other example (except Quit) when when evaluating a symbols actually does > more than return a value (that usually happens in the case of global > constants, whose names begin with $, > > [1]:= $Version > > Out[1]= 8.0 for Mac OS X x86 (64-bit) (February 23, 2011) > > Note, by the way, that Abort[] works but Abort does not: > > In[3]:= Print[a];Abort[];Print[b] > During evaluation of In[3]:= a > Out[3]= $Aborted > > Print[a];Abort;Print[b] > a > b > > Andrzej Kozlowski > > > > > On 5 Sep 2011, at 19:44, DrMajorBob wrote: > >> I, on the other hand, never saw Quit[] until this thread began. >> >> I suppose it figures that if Quit kills the kernel, then also Quit[any >> arguments or none] might also kill the kernel. (The other way 'round >> doesn't necessarily "figure", on the other hand.) >> >> Bobby >> >> On Mon, 05 Sep 2011 07:44:17 -0500, Andrzej Kozlowski >> <akoz at mimuw.edu.pl> wrote: >> >>> Actually (as far as I can tell) Quit is undocumented but Quit[] is: >>> >>> ?Quit >>> Quit[] terminates a Mathematica kernel session. >>> >>> I thought you had made a mistake but I tired just Quit (without the >>> brackets) and was surprised (after all these years!) to see it work. I >>> am wondering if there are more cases like this? >>> >>> Andrzej Kozlowski >>> >>> On 5 Sep 2011, at 13:06, DrMajorBob wrote: >>> >>>> No. For that, you need: >>>> >>>> Quit >>>> >>>> Bobby >>>> >>>> On Sun, 04 Sep 2011 17:06:32 -0500, Themis Matsoukas >>>> <tmatsoukas at me.com> >>>> wrote: >>>> >>>>> So, if I use ClearAll["Global`*"] at the beginning of a notebook and >>>>> execute all the cells, is it the same as running on a fresh kernel? >>>>> >>>>> Themis >>>>> >>>> >>>> >>>> -- >>>> DrMajorBob at yahoo.com >>>> >>> >> >> >> -- >> DrMajorBob at yahoo.com > -- DrMajorBob at yahoo.com

**References**:**Re: Quit versus Clear["Global`*"]***From:*Themis Matsoukas <tmatsoukas@me.com>