Tachyon in SageMathCloud

asked 2014-11-03 05:27:35 +0100

David Roberts
43 ●1 ●3 ●6

I'm new to Sage and only beginner experience in python, so there may be something obvious I'm missing.

I'm trying to create, initially, some plots using Tachyon in SMC. I cut and pasted Niles Johnson's code at this question, namely

sage: f = lambda t: (t,t^2,t^3)
sage: t = Tachyon(camera_center=(5,0,4))
sage: t.texture('t')
sage: t.light((-20,-20,40), 0.2, (1,1,1))
sage: t.parametric_plot(f,-5,5,'t',min_depth=6)
sage: t.show(verbose=True)

and I get the following error

tachyon /projects/6e9b9fc6-5d3c-4c2a-a57f-b5fe78a365fd/.sage/temp/compute2dc1/22136/tmp_Iy4Cih.dat  -format PNG  -o /projects/6e9b9fc6-5d3c-4c2a-a57f-b5fe78a365fd/.sage/temp/compute2dc1/22136/tmp_weeBQD.png   ; rm -f "/projects/6e9b9fc6-5d3c-4c2a-a57f-b5fe78a365fd/.sage/temp/compute2dc1/22136/tmp_Iy4Cih.dat"
Error in lines 6-6
Traceback (most recent call last):
  File "/projects/6e9b9fc6-5d3c-4c2a-a57f-b5fe78a365fd/.sagemathcloud/sage_server.py", line 864, in execute
    exec compile(block+'\n', '', 'single') in namespace, locals
  File "", line 1, in <module>
  File "/usr/local/sage/sage-6.3.beta6/local/lib/python2.7/site-packages/sage/plot/plot3d/tachyon.py", line 339, in show
    os.system('%s %s 2>/dev/null 1>/dev/null &'%(sage.misc.viewer.png_viewer(), filename))
NameError: global name 'sage' is not defined

What should I do? It doesn't seem related to anything in the code used.

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Comments

It works on a classical (local) installation, so the pb might come from the cloud.

tmonteil ( 2014-11-03 10:17:17 +0100 )edit

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answered 2014-11-03 15:29:13 +0100

William Stein
2179 ●11 ●32 ●63 http://wstein.org/

You're hitting a bug in sage-6.3 (the bug has nothing to do with SageMathCloud). It's evidently fixed in sage-6.4, but even then, I don't think that way of viewing a tachyon plot would work in SMC. In any case, here's how to do this in SMC, which works now:

f = lambda t: (t,t^2,t^3)
t = Tachyon(camera_center=(5,0,4))
t.texture('t')
t.light((-20,-20,40), 0.2, (1,1,1))
t.parametric_plot(f,-5,5,'t',min_depth=6)
t.save('a.png')
salvus.file('a.png')

Here's a worksheet illustrating make the 3d plot you want to make, using the regular interactive 3d viewer and also tachyon:

https://cloud.sagemath.com/projects/4...

Comments

I'd upvote, but I've not got the required karma. Virtual +1 from me, then.

David Roberts ( 2014-11-03 23:53:21 +0100 )edit

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