-Pypol Examples
+LinPy Examples
==============
Creating a Polyhedron
-----------------
To create any polyhedron, first define the symbols used. Then use the polyhedron functions to define the constraints for the polyhedron. This example creates a square.
-
- >>> from pypol import *
+
+ >>> from linpy import *
>>> x, y = symbols('x y')
>>> # define the constraints of the polyhedron
>>> square1 = Le(0, x) & Le(x, 2) & Le(0, y) & Le(y, 2)
And(Ge(x, 0), Ge(-x + 2, 0), Ge(y, 0), Ge(-y + 2, 0))
Urnary Operations
------------------
-
+-----------------
+
>>> square1.isempty()
False
>>> square1.isbounded()
True
-
+
Binary Operations
-----------------
-
+
>>> square2 = Le(2, x) & Le(x, 4) & Le(2, y) & Le(y, 4)
>>> square1 + square2
Or(And(Ge(x, 0), Ge(-x + 2, 0), Ge(y, 0), Ge(-y + 2, 0)), And(Ge(x - 2, 0), Ge(-x + 4, 0), Ge(y - 2, 0), Ge(-y + 4, 0)))
- >>> # check if square1 and square2 are disjoint
- >>> square1.disjoint(square2)
- False
+ >>> # check if square1 and square2 are disjoint
+ >>> square1.disjoint(square2)
+ False
Plot Examples
--------------
-
- Linpy uses matplotlib plotting library to plot 2D and 3D polygons. The user has the option to pass subplots to the :meth:`plot` method. This can be a useful tool to compare polygons. Also, key word arguments can be passed such as color and the degree of transparency of a polygon.
-
+-------------
+
+ LinPy uses matplotlib plotting library to plot 2D and 3D polygons. The user has the option to pass subplots to the :meth:`plot` method. This can be a useful tool to compare polygons. Also, key word arguments can be passed such as color and the degree of transparency of a polygon.
+
>>> import matplotlib.pyplot as plt
>>> from matplotlib import pylab
>>> from mpl_toolkits.mplot3d import Axes3D
- >>> from pypol import *
+ >>> from linpy import *
>>> # define the symbols
>>> x, y, z = symbols('x y z')
>>> fig = plt.figure()
>>> cham = Le(0, x) & Le(x, 3) & Le(0, y) & Le(y, 3) & Le(0, z) & Le(z, 3) & Le(z - 2, x) & Le(x, z + 2) & Le(1 - z, x) & Le(x, 5 - z) & Le(z - 2, y) & Le(y, z + 2) & Le(1 - z, y) & Le(y, 5 - z) & Le(y - 2, x) & Le(x, y + 2) & Le(1 - y, x) & Le(x, 5 - y)
>>> cham.plot(cham_plot, facecolors=(1, 0, 0, 0.75))
>>> pylab.show()
-
+
.. figure:: images/cube.jpg
:align: center
-
- The user can also inspect a polygon's vertices and the integer points included in the polygon.
-
+
+ The user can also inspect a polygon's vertices and the integer points included in the polygon.
+
>>> diamond = Ge(y, x - 1) & Le(y, x + 1) & Ge(y, -x - 1) & Le(y, -x + 1)
>>> diamond.vertices()
[Point({x: Fraction(0, 1), y: Fraction(1, 1)}), Point({x: Fraction(-1, 1), y: Fraction(0, 1)}), Point({x: Fraction(1, 1), y: Fraction(0, 1)}), Point({x: Fraction(0, 1), y: Fraction(-1, 1)})]
>>> diamond.points()
[Point({x: -1, y: 0}), Point({x: 0, y: -1}), Point({x: 0, y: 0}), Point({x: 0, y: 1}), Point({x: 1, y: 0})]
-
-
-
-
-
-
-
+
+
+
+
+
+
+