7.119 bug in plots[display] under Unix, Maple 6 and Maple 7 (31.1.02)

7.119.1 William Slough

I am using Maple 6 under Linux and I’m trying to animate a sequence of point plots. With insequence=false, everything looks fine but when I set insequence=true, the animation has just a single point: the last frame.

Here’s a simple example:

with(plots); 
p1 := plot([[1,2]], style=POINT, view=[0..5,0..5], scaling=constrained): 
p2 := plot([[2,4]], style=POINT, view=[0..5,0..5], scaling=constrained): 
display([p1,p2], insequence=true);
 

It is corrected with Maple 8 (U. Klein)

7.119.2 Mark Fitch (1.2.02)

I have experienced this, but only under Solaris and Linux. The problem does not occur under Windows systems. I presume this is a bug in the point plotting routine in the unix versions.

7.119.3 Dr Francis J. Wright (5.2.02)

Using Maple 7 under Windows NT it seems to work fine. The animation initially shows the first point, and when I run the animation it flips to the second point.

If I single step, it flips back and forth. However, I have experienced a lot of problems with point plots in Maple 6. I think there are problems driving some displays, which vary from minor corruption of the display to completely crashing Maple.

I was able to avoid this problem on a machine running Windows 98 by reducing the display acceleration level, which had no discernible effect other than to avoid crashing Maple.

I discovered very recently on our teaching machines, which run Windows ME, that Maple 6 would crash if asked to display a single point alone, but not if the point plot was combined with another (non-point) plot. So, if you experiment along these lines you might be able to find a work-around.

The problem might be fixed in Maple 7; I haven’t noticed it in Maple 7, but I haven’t tried Maple 7 on any of the machines where there were problems using Maple 6.

[Incidentally, Maple 6 also seems to crash when it tries to open a Maple 7 worksheet containing 3D plots! A workaround for that is to delete the plots USING MAPLE 7 and then re-execute the worksheet using Maple 6.]

7.119.4 Koch-Beuttenmueller (7.2.02)

The problem exists for Maple 7 as well. I tried under Compaq Tru 64.

7.119.5 Theodore Kolokolnikov (13.2.02)

Another problem under linux version 7 (i’m not sure if this is version-7 specific) is that it takes relatively long time to display even a very simple plot (for example plot(sin(x),x=0..10)).

It seems that the Linux version of Maple was not well tested, at least when compared to windows.

7.119.6 David L. Johnson (20.2.02)

| Theodore Kolokolnikov wrote: ...

I don’t think you have found the source of your problem. I would guess that it might be specific to certain hardware. At any rate plotting for me is quite fast with Maple 7 (debian linux 2.2, PII@400mHz, s3-virge card).