>> 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
|
(NAG)
