MathGroup Archive 2009

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

Search the Archive

Re: Graphics and DisplayFunction

  • To: mathgroup at
  • Subject: [mg98275] Re: Graphics and DisplayFunction
  • From: mark mcclure <mcmcclur at>
  • Date: Fri, 3 Apr 2009 20:13:21 -0500 (EST)
  • References: <gqsn9m$3tr$> <gr21l6$lq8$>

On Apr 3, 5:11 am, David Bailey <d... at> wrote:
> I would forget about the DisplayFunction option - it is more or
> less obsolete.

If DisplayFunction -> f is used as an option to a Plot function
or Show, then f is applied to the result.  Since the default
value of DisplayFunction is $DisplayFunction, this makes
$DisplayFunction something like $Post for graphical commands.
This can be quite handy.  Here are three example settings for

 * Create a tooltip when hovering over a graph:
   $DisplayFunction = Tooltip[#, "On graph!"] &;

 * Show graph and also auto-export to a file:
   cnt = 0;
   $DisplayFunction = (
     Export["pic" <> ToString[++cnt] <> ".png",#]; #

 * Send graphics to another program:
   df[g_] := Module[
     strm = OpenWrite["!open -f -a /Applications/"];
     WriteString[strm, ExportString[g, "EPS"]];
   $DisplayFunction = df;

After defining $DisplayFunction by entering any of these
commands, simply enter a graphical command, like
Plot[x^2, {x,-2,2}], to see it in action.  The last
example is set up to pipe the output to on the
Mac, but I suppose that something similar would work on the
PC.  This last one is most interesting if you're running a
text based interface, like the Mac Terminal.  To get it to
work in that context you need to install a front end as well
by first entering:
I actually do this frequently when manipulating Mathematica
from other programs.

So, have fun with DisplayFunction,
Mark McClure

  • Prev by Date: Re: passing an array variable as a file name string to FindList
  • Next by Date: StringJoin with ToString
  • Previous by thread: Re: Re: Graphics and DisplayFunction
  • Next by thread: Re: Graphics and DisplayFunction