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Re: Preventing plotting on output
*To*: mathgroup at smc.vnet.net
*Subject*: [mg20120] Re: Preventing plotting on output
*From*: "Allan Hayes" <hay at haystack.demon.co.uk>
*Date*: Sat, 2 Oct 1999 03:04:51 -0400
*References*: <7suv5r$21s@smc.vnet.net>
*Sender*: owner-wri-mathgroup at wolfram.com
Adam,
The problem is that Plot has the attribute HoldAll, so inspects the
unevaluated nodisp, finds that it is not an option or a nested list of
options.
We have to get nodisp to evaluate before the inspection. Thus
nodisp = DisplayFunction -> Identity;
graph1 = Plot[Sin[2 Pi x], {x, 0, 2}, Evaluate[nodisp]]
But this does spoil the brevity a bit..
Alternative ways ( besides using SetOptions) are illustrated by
(1)
Block[{$DisplayFunction = Identity},
{Plot[Sin[3 Pi x], {x, 0, 2}],
Plot[Sin[ 4Pi x], {x, 0, 2}]}
] // Show
and
(2)
<< Graphics`Graphics`
DisplayTogether[
Plot[Sin[3 Pi x], {x, 0, 2}],
Plot[Sin[ 4Pi x], {x, 0, 2}]]
(3) (Global version of (1))
Turn off all displays
dsf = $DisplayFunction
$DisplayFunction = Identity
gr1 = Plot[Sin[3 Pi x], {x, 0, 2}];
gr2 = Plot[Sin[4Pi x], {x, 0, 2}];
Restore $DisplayFunction
$DisplayFunction = dsf
Show graphics
Show[gr1, gr2]
---------------------
Allan Hayes
Mathematica Training and Consulting
Leicester UK
www.haystack.demon.co.uk
hay at haystack.demon.co.uk
Voice: +44 (0)116 271 4198
Fax: +44 (0)870 164 0565
<adam.smith at hillsdale.edu> wrote in message news:7suv5r$21s at smc.vnet.net...
> I know I could find the answer to this if I looked hard enough through
> the Help and/or Manual, but I am certain one of the experts out there
> will have the solution immediately.
>
> I want to construct some plots and then display them combined on one
> graph. The Plot[] for each individual plot is fairly lengthy and I was
> hoping to save some space by replacing the "DisplayFunction->Identity"
> with a single word like "nodisp". In the final Show[] I would then
> turn the display back on with the
> usual "DisplayFunction>$DisplayFunction" (maybe even equate it with a
> single term like "disp").
>
> Here is a simplified example of what I quickly tried without success
>
> nodisp = DisplayFunction -> Identity
>
> graph1 = Plot[Sin[2 Pi x],{x,0,2},nodisp] Error messages show up
> graph2 = Plot[Sin[4 Pi x],{x,0,2},nodisp]
>
> Show[{plot1,plot2},DisplayFunction -> $DisplayFunction]
>
> I realize I could use SetOptions[] to temporarily turn off and turn on
> display, but defining nodisp seems more natural and intuitive to me.
>
> Adam Smith
>
>
> Sent via Deja.com http://www.deja.com/
> Before you buy.
>
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