VectorPlot[{Exp[x],x}, {x,-5,5}, {y,-5,5}, VectorPoints -> Table[{x,1/x},{x,-5,5,0.1}]] The vector at (0,0) shouldn't be there. Why is it drawn?
$\begingroup$ $\endgroup$
3 
- 3$\begingroup$ It would be good, and everyone will appreciate it if you can please provide copyable code. $\endgroup$Erosannin– Erosannin2025-04-06 04:17:45 +00:00Commented Apr 6 at 4:17
- 2$\begingroup$ What version and platform do you use? It work fine in 14.2 version on Mac. $\endgroup$cvgmt– cvgmt2025-04-06 11:09:23 +00:00Commented Apr 6 at 11:09
- $\begingroup$ @cvgmt i'm using 11 on wins $\endgroup$feynman– feynman2025-04-07 04:12:35 +00:00Commented Apr 7 at 4:12
Add a comment |
1 Answer
$\begingroup$ $\endgroup$
5 The problem lies with your VectorPoints. Your list of points given by following table
Table[{x,1/x},{x,-5,5,0.1}] include {0., ComplexInfinity}. You can simply exclude that point.
points = Join[Table[{x, 1/x}, {x, -5, -.1, .1}],Table[{x, 1/x}, {x, .1, 5, .1}]]; VectorPlot[{Exp[x], x}, {x, -5, 5}, {y, -5, 5}, VectorPoints -> points] 
- 2$\begingroup$
Table[{x,1/x},{x,-5,5,0.1}]does not contain{0,0}, nor any point close to it. You seem to say it does, right? The point you exclude is{2.77556*10^-16, 3.60288*10^15}, the farthest point from{0,0}, which solves the problem for a reason as yet unexplained. $\endgroup$Michael E2– Michael E22025-04-06 12:56:54 +00:00Commented Apr 6 at 12:56 - 1$\begingroup$ Maybe I should add that I'm using V14.2.0, since there seems to be a difference in versions. $\endgroup$Michael E2– Michael E22025-04-06 13:07:22 +00:00Commented Apr 6 at 13:07
- 2$\begingroup$ @MichaelE2 I am so sorry, my bad. I had a typo it should been the point
{0.,ComplexInfinity}. $\endgroup$Erosannin– Erosannin2025-04-06 13:35:40 +00:00Commented Apr 6 at 13:35 - 1$\begingroup$ Thanks for the reply. It brought to light a change in how
Table[]works, about which I just posted a question. $\endgroup$Michael E2– Michael E22025-04-06 17:34:38 +00:00Commented Apr 6 at 17:34 - $\begingroup$ @MichaelE2 upvoted your new Table[] question $\endgroup$feynman– feynman2025-04-07 04:15:05 +00:00Commented Apr 7 at 4:15