|
|
D.9.1.3 mplot
Procedure from library graphics.lib (see graphics_lib).
- Usage:
- mplot(fname, I [,I1,I2,..,s] ); fname=string; I,I1,I2,..=ideals,
s=string representing the plot region.
Use the ideals I1,I2,.. in order to produce multiple plots (they need
to have the same number of entries as I!).
- Return:
- string, text with Mathematica commands to display a plot
- Note:
- The plotregion is defaulted to -1,1 around zero.
For implicit given curves enter first the string returned by
procedure mathinit into Mathematica in order to load ImplicitPlot.
The following conventions for I are used:
| | - ideal with 2 entries in one variable means a parametrised plane curve,
- ideal with 3 entries in one variable means a parametrised space curve,
- ideal with 3 entries in two variables means a parametrised surface,
- ideal with 2 entries in two variables means an implicit curve
given as I[1]==I[2],
- ideal with 1 entry (or one polynomial) in two variables means
an implicit curve given as f == 0,
|
Example:
| | LIB "graphics.lib";
// --------- plane curves ------------
ring rr0 = 0,x,dp; export rr0;
==> // ** `rr0` is already global
ideal I = x3 + x, x2;
ideal J = x2, -x+x3;
mplot("",I,J,"-2,2");
==>
==> ParametricPlot[{{s^3+s,s^2},{s^2,s^3-s}},{s,-2,2},
==> AspectRatio->Automatic];
==>
// Paste the output into a Mathematica notebook
// active evalutation of the cell with SHIFT RETURN
// --------- space curves --------------
I = x3,-1/10x3+x2,x2;
mplot("",I);
==>
==> ParametricPlot3D[{{s^3,-1/10*s^3+s^2,s^2}},{s,-1,1},
==> ViewPoint->{1.3,-2.4,2}];
==>
// Paste the output into a Mathematica notebook
// active evalutation of the cell with SHIFT RETURN
// ----------- surfaces -------------------
ring rr1 = 0,(x,y),dp; export rr1;
==> // ** `rr1` is already global
ideal J = xy,y,x2;
mplot("",J,"-2,1","1,2");
==>
==> ParametricPlot3D[{{s*t,t,s^2}},{s,-2,1},{t,1,2},
==> Boxed->True, Axes->True, ViewPoint->{1.3,-2.4,2}];
==>
// Paste the output into a Mathematica notebook
// active evalutation of the cell with SHIFT RETURN
kill rr0,rr1;
|
|
