[Maxima-bugs] [ maxima-Bugs-2752650 ] implicit_plot: cirkel to small to appear?

[SourceForge.net <no...@so...>]

Bugs item #2752650, was opened at 2009-04-11 12:55
Message generated for change (Comment added) made by crategus
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2752650&group_id=4933

Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: None
Group: None
>Status: Pending
>Resolution: Works For Me
Priority: 5
Private: No
Submitted By: Harry Litzroth (hlitzroth)
Assigned to: Nobody/Anonymous (nobody)
Summary: implicit_plot: cirkel to small to appear?

Initial Comment:
After loading implicit_plot, the instruction 
      implicit_plot([(y+4)^2+(x-5)^2-1/24=0],
                    [x,-10,10],[y,-10,10],
                    [gnuplot_preamble,"set zeroaxis;set size ratio 1;"]);
shows a small cirkel where it should be.

However the instruction
      implicit_plot([(y+4)^2+(x-5)^2-1/25=0],
                    [x,-10,10],[y,-10,10],
                    [gnuplot_preamble,"set zeroaxis;set size ratio 1;"]);
does not show anything anymore. And the same is true for denominators larger than 25.

The problem appears in command-line maxima, in xmaxima and in wxmaxima.

----------------------------------------------------------------------

>Comment By: Dieter Kaiser (crategus)
Date: 2010-01-19 21:28

Message:
As suggested in this thread after an increase of the values of ip_grip both
examples work as expected. 

Setting the status to pending and the resolution to "works for me". 
Dieter Kaiser

----------------------------------------------------------------------

Comment By: Nobody/Anonymous (nobody)
Date: 2009-04-21 12:41

Message:
The solution given by mister Andrejv works fine, as I could have imagined.
The creation of the plot of course becomes slower with increasing values in
ip_grid. Thank you for this solution.

----------------------------------------------------------------------

Comment By: Andrej Vodopivec (andrejv)
Date: 2009-04-13 00:19

Message:
This is a consequence of the algorithm used by implicit plot (changes of
signs). A workaround is to increase the values of ip_grip.

ip_grid: [60, 60]$
implicit_plot(...)$

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=104933&aid=2752650&group_id=4933