Line interrupted in plot

[matswb]

In the following plot

plot([(x+2)*e^(1/x), x+3], (x, -5, 15), ymax=10, detect_poles='show')

the x+3 line is interrupted. I think detect_poles causes this. My current work-around is to use plot_points=1000.

Component: graphics

Keywords: plot line interrupted

Reviewer: Dave Morris

Issue created by migration from https://trac.sagemath.org/ticket/25027

[kcrisman]

comment:1

Your issue, I think, is caused by plotting both functions together; apparently it's detecting the other one's pole, which is strange.

The underlying thing is weirder, actually; see this example.

plot((x+1)*e^(1/(x-1)), (x, -5, 15), ymax=10, detect_poles=True)+plot(x+2, (x, -5, 15), ymax=10)

This allows one to see it slightly better, since it isn't on the y-axis. Unless this is a separate issue.

This is weird, because I don't see an obvious place in the code where it should do this if the slopes aren't within epsilon of infinity, so to speak, and definitely not in these cases. Sorry I can't help right away with an obvious fix, because the code was reasonable when put in and I don't recall this particular thing coming up.

[DaveWitteMorris]

Reviewer: Dave Morris

[DaveWitteMorris]

comment:2

This should be closed as a duplicate of #31089.

[kwankyu]

comment:3

Right.

[DaveWitteMorris]

comment:4

Thanks!