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@mjkaufer

mjkaufer/countStudents.py

Last active Dec 19, 2018
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Count the number of students in the example in my blog
from CoefficientCalculator import Term, MultiTerm, Expression, Scalar
# Some brief terminology (no pun intended)
# A term is something like x, x^2, x^3, etc.
# 1 can also be a term
# A multiterm is the product of several terms. Something like x * y or x * z^2 is fine
# Multiterms also have constants, so 5 * x * y^3 is also a valid multiterm
# Expressions are several multiterms added together. Something like (1 + x) is an expression
# create classes (as in school classes, not object oriented classes) x, y, z
x = Term("x")
y = Term("y")
z = Term("z")
# w is the "global" class
w = Term("w")
students = []
# student a
students.append(MultiTerm([x, z, w]))
# student b
students.append(MultiTerm([x, w]))
# student c
students.append(MultiTerm([x, y, z, w]))
# student d
students.append(MultiTerm([x, y, w]))
# student e
students.append(MultiTerm([y, w]))
# student f
students.append(MultiTerm([y, w]))
# student g
students.append(MultiTerm([z, w]))
# student h
students.append(MultiTerm([z, w]))
# add a "1 + " to the start of each student's multiterm, making it an expression
studentExpressions = [Expression([Scalar(), s]) for s in students]
# base expression of "1"
e = Expression([Scalar()])
# take the product of all the expressions
for s in studentExpressions:
e *= s
# get the coefficient for the Thanos problem
e.getCoefficient(MultiTerm([Term("x", 2), Term("y", 2), Term("z", 2), Term("w", 4)]))
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