MathGroup Archive 2000

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Newbie

  • To: mathgroup at
  • Subject: [mg24493] Re: [mg24490] Newbie
  • From: "Mark Harder" <harderm at>
  • Date: Thu, 20 Jul 2000 03:01:37 -0400 (EDT)
  • Sender: owner-wri-mathgroup at

Dear Want,
    You describe some very strange behaviour.  The correct syntax is
D[x^2,x], which on my system (WinNT v.4.0, Mathematica 4.0.1) outputs 2 x,
as expected (since Mathematica requires a second argument telling it which
symbol is variable, all others in the expression being treated as
    For D[x^2] by itself and within Print[] my system outputs simply x^2.  I
can't imagine how enclosing the improperly formed command within Print[]
should have any effect on the result.
    The reason you get no output at all with "D[x^2];" is that following a
command with ";" suppresses output, except when the command is an output
command, like Print[], or Show[]. The semicolon is used either to suppress
output from preliminary calculations, or to separate commands in a compound
expression (several expressions taking the place of "expr" in Mathematica's
documentation).  In the latter case, you *have to* use Print[] or other
explicit output commands if you want output from within the body of the
compound expression.
    There are a couple of relatively short books out there for beginners.  I
suggest you get one and read it, to save yourself a lot of time.
-mark e. harder
harderm at

-----Original Message-----
From: WantToKnowPlease <replyNewsGroubPlease at>
To: mathgroup at
Subject: [mg24493] [mg24490] Newbie

>I've just started using mathematica....
>When I type a command and press (shift)+(enter) I don't see any output
>unless I preceded the command by print command
>D[x^2];(shift)+(enter) doesn't do anything !!(at least I can't see what it
>Print[D[x^2]];(shift)+(enter) prints 2 x
>any help is greatly appreciated

  • Prev by Date: Re: ExponentFunction
  • Next by Date: Re: How to create Tex documents
  • Previous by thread: RE: Newbie
  • Next by thread: Re: Newbie