ASKSAGE: Sage Q&A Forum - RSS feedhttps://ask.sagemath.org/questions/Q&A Forum for SageenCopyright Sage, 2010. Some rights reserved under creative commons license.Sat, 11 Feb 2023 19:32:55 +0100Can I directly plot a 2-dimensional subscheme?https://ask.sagemath.org/question/66348/can-i-directly-plot-a-2-dimensional-subscheme/Hello! I'm new to SAGE. I came over because it seemed a good way to plot 2-dimensional varieties, then I discovered the SAGE system for schemes and
fell in love with it immediately. So I thought, why not try it out, define the 2-dimensional varieties as schemes and then plot them. But I didn't see
any distinct plotting tools for schemes in the documentation, so I just tried to define a scheme V, then use implicit_plot3d(V) for plotting. However,
if I don't add some coordinates, the compiler complains that I didn't provide any range arguments, and when I add coordinates, for instance if I
define
```
V = A3.subscheme([x^2+y^2+z^2-1])
implicit_plot3d(V, (x, -1, 1), (y, -1, 1), (z, -1, 1))
```
it tells me
```
/usr/lib/python3.10/site-packages/sage/repl/rich_output/display_manager.py:610: RichReprWarning: Exception in _rich_repr_ while displaying object: Coordinates [1, -1, -1] do not define a point on Closed subscheme of Affine Space of dimension 3 over Rational Field defined by:
x^2 + y^2 + z^2 - 1
warnings.warn(
Graphics3d Object
```
So it even recognizes that the thing it should plot is a closed subscheme, but it doesn't understand that not all points in the range of the plot have
to be in the subscheme. So my general question is: is there a way to plot suitable 2-dimensional schemes directly?Sat, 11 Feb 2023 19:32:55 +0100https://ask.sagemath.org/question/66348/can-i-directly-plot-a-2-dimensional-subscheme/