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[MUG] contourplot options bug
| [MUG] contourplot options bug |
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Author: Dale Alspach
Posted: Mon, 27 May 2002 09:36:07 -0500
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>> From: Dale Alspach "alspach"
It appears that there is some bug in contourplot (Maple 7 linux).
The combination of variable range for y, filled=true and explicit
contours produces a large red triangle (side 10^14) for (x^2+y^2)^(1/4).
Changing the exponent from 1/4 to 1/2 or 1/3 yields the
expected plot. 1/5 and 1/6 also produce triangles.
This plots nonsense:
contourplot((x^2+y^2)^(1/4),x=-2..2,y=-(4-x^2)^(1/2)..(4-x^2)^(1/2),filled=true,contours=[0,.2,.4,.6,.8,1,1.1,1.2,1.3]);
These plot something reasonable:
contourplot((x^2+y^2)^(1/4),x=-2..2,y=-2..2,filled=true,contours=[0,.2,.4,.6,.8,1,1.1,1.2,1.3]);
contourplot((x^2+y^2)^(1/2),x=-2..2,y=-(4-x^2)^(1/2)..(4-x^2)^(1/2),filled=true,contours=[0,.2,.4,.6,.8,1,1.1,1.2,1.3]);
contourplot((x^2+y^2)^(1/4),x=-2..2,y=-(4-x^2)^(1/2)..(4-x^2)^(1/2),filled=true,contours=10);
Dale Alspach
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| [MUG] Re: contourplot options bug |
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Author: Robert Israel
Posted: Tue, 4 Jun 2002 14:42:54 -0700 (
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>> From: Robert Israel "israel"
The bug seems to be fixed in Maple 8.
Robert Israel "israel"
Department of Mathematics http://www.math.ubc.ca/~israel
University of British Columbia
Vancouver, BC, Canada V6T 1Z2
On Mon, 27 May 2002, Dale Alspach wrote:
> It appears that there is some bug in contourplot (Maple 7 linux).
> The combination of variable range for y, filled=true and explicit
> contours produces a large red triangle (side 10^14) for (x^2+y^2)^(1/4).
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