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Re: Export graphics without notebook ( using .m file)

  • To: mathgroup at smc.vnet.net
  • Subject: [mg129216] Re: Export graphics without notebook ( using .m file)
  • From: awnl <awnl at gmx-topmail.de>
  • Date: Fri, 21 Dec 2012 05:42:07 -0500 (EST)
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  • References: <kajode$ilu$1@smc.vnet.net>

Hi,

> It is example from help:
> ---------------
> div[{vx_, vy_}] := D[vx, x] + D[vy, y];
> vf = {Cos[x + y^3], Sin[y + x^3]};
> fig = StreamDensityPlot[Evaluate[{vf, div[vf]}], {x, -3, 3},
>      {y, -3, 3}, StreamPoints -> Fine, StreamScale -> Large,
>      ColorFunction -> "Rainbow", MaxRecursion -> 2,
>      LightingAngle -> Automatic, StreamStyle -> Black];
> Export["tt.jpg", fig];
> ---------------
> 
> The question is:
> 
> Why this works fine inside Mathematica notebook
> and doesnt work as a script ?
> 
> math < example.m
> 
> generates tt.jpg file but not identical as from notebook ?
> 

I think rendering graphics and exporting needs a frontend. 
>From a batch job you can use the function UsingFrontEnd to 
run these functions. See the reference page in the help 
browser for more details: ref/UsingFrontEnd 

Depending on how you start your job you might need to provide 
some prerequisites: on a linux machine you typically need 
an X-server running for the frontend. Here: 
<http://reference.wolfram.com/legacy/v8/webMathematica/tutoria/InstallationXWindows.html#3537196>
is some documentation how to set this up for WebMathematica with 
e.g. Xvnc or vncserver which you basically can also use for a 
batch job started from a terminal session or a cron job...

hth,

albert




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