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D.9.3.1 plot
Procedure from library surf.lib (see surf_lib).
- Usage:
- plot(I); I ideal or poly
- Assume:
- I defines a plane curve or a surface given by one equation
- Return:
- nothing
- Note:
- requires the external program `surf` to be installed,
to close the graphical interface just press `Q`
Example:
| | LIB "surf.lib";
// --------- plane curves ------------
ring rr0 = 0,(x1,x2),dp;
ideal I = x1^3 - x2^2;
plot(I);
ring rr1 = 0,(x,y,z),dp;
ideal I(1) = 2x2-1/2x3 +1-y+1;
plot(I(1));
// ---- Singular Logo --------------
poly logo = ((x+3)^3 + 2*(x+3)^2 - y^2)*(x^3 - y^2)*((x-3)^3-2*(x-3)^2-y^2);
plot(logo);
// Steiner surface
ideal J(2) = x^2*y^2+x^2*z^2+y^2*z^2-17*x*y*z;
plot(J(2));
// --------------------
plot(x*(x2-y2)+z2);
// E7
plot(x^3-x*y^3+z^2);
// Whitney umbrella
plot(z^2-x^2*y);
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