86 lines
2.9 KiB
Python
86 lines
2.9 KiB
Python
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#! /usr/bin/env python
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# -*- coding: utf-8 -*-
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# vim:fenc=utf-8
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#
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# Copyright © 2017 lafrite <lafrite@Poivre>
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#
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# Distributed under terms of the MIT license.
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from mapytex.calculus.core.tree import Tree
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from .mo import MO, MOnumber, MOstr
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from .exceptions import MOError
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__all__ = ["MOMonomial"]
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class MOMonomial(MO):
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""" Monomial math object"""
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def __init__(self, coefficient, variable, power = 1):
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""" Initiate the MOMonomial
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:param coefficient: coefficient of the monomial (a non zero constant)
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:param variable: varaible of the monomial (a MOstr or later a MOSqrt)
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:param power: non negative interger (MOnumber type)
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>>> MOMonomial(4, "x", 2)
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<MOMonomial 4x^2>
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>>> MOMonomial(4, "x", 1)
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<MOMonomial 4x>
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>>> MOMonomial(4, 3, 1)
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Traceback (most recent call last):
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...
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mapytex.calculus.core.MO.exceptions.MOError: The variable of a monomial should be convertible into MOstr
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>>> MOMonomial(4, "x", 0)
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Traceback (most recent call last):
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...
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mapytex.calculus.core.MO.exceptions.MOError: The power of a monomial should be greater than 0
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>>> MOMonomial(4, "x", -2)
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Traceback (most recent call last):
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...
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mapytex.calculus.core.MO.exceptions.MOError: The power of a monomial should be greater than 0
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>>> MOMonomial(4, "x", 2.4)
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Traceback (most recent call last):
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...
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mapytex.calculus.core.MO.exceptions.MOError: The power of a monomial should be a integer
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>>> MOMonomial(0, "x", 1)
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Traceback (most recent call last):
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...
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mapytex.calculus.core.MO.exceptions.MOError: The coefficient of a monomial should not be 0
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"""
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_coefficient = MO.factory(coefficient)
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if coefficient == 0:
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raise MOError("The coefficient of a monomial should not be 0")
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self._coefficient = _coefficient
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_variable = MO.factory(variable)
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if not isinstance(_variable, MOstr):
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raise MOError("The variable of a monomial should be convertible into MOstr")
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self._variable = _variable
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_power = MO.factory(power)
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if power <= 0:
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raise MOError("The power of a monomial should be greater than 0")
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elif not isinstance(_power.value, int):
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raise MOError("The power of a monomial should be a integer")
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self._power = _power
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if self._power > 1:
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self.value = Tree("*",
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self._coefficient,
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Tree("^",
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self._variable,
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self._power
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)
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)
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else:
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self.value = Tree("*",
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self._coefficient,
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self._variable,
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)
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# -----------------------------
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# Reglages pour 'vim'
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# vim:set autoindent expandtab tabstop=4 shiftwidth=4:
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# cursor: 16 del
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