John L's profile - activity

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2024-02-21 14:00:32 +0200	received badge	● Famous Question (source)
2023-09-09 17:57:23 +0200	received badge	● Popular Question (source)
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2022-10-12 02:01:12 +0200	received badge	● Notable Question (source)
2022-10-12 02:00:28 +0200	commented answer	Changing the meaning of / Sure, this will work, but then I have to do it in every single line that involves division. There are a lot of them, it
2022-10-12 02:00:03 +0200	commented answer	Changing the meaning of / Sure, this will work, but then I have to do it in every single line that involves division. There are a lot of them, it
2022-10-12 01:04:05 +0200	asked a question	Changing the meaning of / Changing the meaning of / I have a program that makes some calculations in a ring R, where R may be either approximate r
2022-10-01 06:20:21 +0200	received badge	● Popular Question (source)
2022-06-02 20:15:30 +0200	edited question	indeterminacy_locus() broken? indeterminacy_locus() broken? The following code throws an error: A2.<x,y>= AffineSpace(QQ,2) H = End(A2) f = H([
2022-06-02 20:15:07 +0200	asked a question	indeterminacy_locus() broken? indeterminacy_locus() broken? The following code throws an error: A2.<x,y>= AffineSpace(QQ,2) H = End(A2) f = H([
2021-04-02 20:49:16 +0200	received badge	● Popular Question (source)
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2020-12-10 07:37:24 +0200	received badge	● Nice Question (source)
2020-12-05 16:46:45 +0200	received badge	● Editor (source)
2020-12-05 16:46:12 +0200	asked a question	Concatenate bezier paths? I have two bezier paths path1 and path2 (constructed using arc(...)). They have the same beginning point and end point, and I'd like to join them into a single path and fill the interior. What's the right way to do this? If I just try to concatenate the lists path1.path and path2.path and then call bezier_curve() and the result, it generates an error when I try to display it. Here is a simple failed attempt. `arc1 = arc((0,1),sqrt(2),sector=(5pi/4,7pi/4)) arc2 = arc((0,-1),sqrt(2),sector=(pi/4,3*pi/4)) path1 = arc1[0].bezier_path() path2 = arc2[0].bezier_path() combo = bezier_path(path1[0].path+path2[0].path) combo.show()`
2020-11-21 20:16:40 +0200	received badge	● Supporter (source)
2020-11-20 17:03:05 +0200	asked a question	Filling a hyperbolic polygon I am trying to draw some hyperbolic polygons in the Poincare disk model. `poincaredisc = HyperbolicPlane().PD() lines = [ poincaredisc.get_geodesic(1,I), poincaredisc.get_geodesic(I,-1), poincaredisc.get_geodesic(1,-1) ] plots = [ plot(line,axes=False) for line in lines ] show(sum(plots))` I'd like to fill it in with a solid color. This isn't documented in HyperbolicPlane as far as I can tell. But maybe there is some general-purpose way to do this with these kind of graphics objects. Any ideas?
2016-08-30 15:45:45 +0200	received badge	● Famous Question (source)
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2015-04-02 15:40:14 +0200	received badge	● Popular Question (source)
2015-02-21 00:21:11 +0200	received badge	● Student (source)
2015-02-17 22:30:44 +0200	commented question	sage-mode installation Yes, haven't noticed problems with anything else.
2015-02-17 21:07:30 +0200	asked a question	sage-mode installation I'm new to sage, and trying to set up sage_mode with emacs. As suggested here, I run "sage -i sage_mode" to install it. This gives the error message mkdir: cannot create directory ‘’: No such file or directory /usr/bin/sage: line 766: /usr/build/pipestatus: No such file or directory Googling this doesn't seem to turn up anything relevant. Any suggestions? I'm running the build from the Arch Linux repos (64 bit).