X-Git-Url: https://svn.cri.ensmp.fr/git/linpy.git/blobdiff_plain/d9ce6feb2d36e40e83326744f1d4ff3890d1874f..7b93cea1daf2889e9ee10ca9c22a1b5124404937:/doc/examples.rst diff --git a/doc/examples.rst b/doc/examples.rst index 7a390d3..a4b0f5a 100644 --- a/doc/examples.rst +++ b/doc/examples.rst @@ -1,11 +1,11 @@ -Linpy 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) @@ -13,32 +13,32 @@ Creating a Polyhedron 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() @@ -47,21 +47,21 @@ Plot Examples >>> 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})] - - - - - - - + + + + + + +