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MathGroup Archive 2000

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export graphics

  • To: mathgroup at smc.vnet.net
  • Subject: [mg22202] export graphics
  • From: schadow at netcom.ca
  • Date: Fri, 18 Feb 2000 02:34:38 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

Inspired by a question about animated gif I tried to build some my own,
but without success:

<< Graphics`Animation`

gr = Animate[
    Plot[Sin[x t], {x, -\[Pi], \[Pi]}, PlotRange -> {-1, 1}], {t, 0, 1}]

Export["gr.gif", gr,"GIF"]

gives the error message

Export::"type": "\!\(Null\) cannot be exported to the \!\(\"GIF\"\)
format."


Let's try a single picture:

gr2 = Plot[Sin[x], {x, -Pi, Pi}]
Export["gr.gif", gr2]

gives a black gif picture. On the other hand

Export["gr.eps", gr2]

works fine. 

A more successful way to get a GIF image is:

Display["gr.gif", gr2, "GIF"]

The online help says

?Display

Display[channel, expr,"format\"] writes boxes, cells or notebook
expressions in the specified format."

?Export

Export[\"file\", expr, \"format\"] exports data to a file, converting it
to the specified format."

So, the calling sequence is similar, but only the latter case worked for
me. What am I doing wrong here, and moreover how do I get the animated
gif? (I am working with Mathematica 4.0 under Linux)

Thanks for your help,
Wolfgang

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