93 lines
2.0 KiB
Python
93 lines
2.0 KiB
Python
#! /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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"""
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Multiply MO with typing
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"""
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from multipledispatch import Dispatcher
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from ..tree import Tree
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from ..MO.mo import MO, MOnumber, MOstr
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from ..MO.fraction import MOFraction
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from ..MO.monomial import MOstrPower, MOMonomial
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multiply_doc = """ Multiply MOs
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:param left: left MO
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:param right: right MO
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:returns: Tree or MO
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"""
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multiply = Dispatcher("multiply", doc=multiply_doc)
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@multiply.register((MOnumber, MOFraction), MOstr)
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def moscalar_mostr(left, right):
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""" Multiply a scalar with a letter to create a MOMonomial
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>>> a = MOnumber(2)
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>>> b = MOstr('x')
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>>> multiply(a, b)
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<MOMonomial 2x>
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>>> a = MOFraction(1, 5)
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>>> multiply(a, b)
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<MOMonomial 1 / 5x>
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"""
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return MOMonomial(left, right)
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@multiply.register(MOstr, (MOnumber, MOFraction))
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def mostr_moscalar(left, right):
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""" Multiply a scalar with a letter to create a MOMonomial
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>>> a = MOstr('x')
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>>> b = MOnumber(2)
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>>> multiply(a, b)
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<MOMonomial 2x>
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>>> b = MOFraction(1, 5)
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>>> multiply(a, b)
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<MOMonomial 1 / 5x>
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"""
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return MOMonomial(right, left)
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@multiply.register((MOnumber, MOFraction), MOstrPower)
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def moscalar_mostrpower(left, right):
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""" Multiply a scalar with a MOstrPower
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>>> a = MOnumber(4)
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>>> x = MOstrPower('x', 4)
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>>> print(multiply(a, x))
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*
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> 4
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> ^
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| > x
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| > 4
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"""
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return MOMonomial(left, right)
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@multiply.register(MOstrPower, (MOnumber, MOFraction))
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def mostrpower_moscalar(left, right):
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""" Multiply a MOstrPower with a scalar
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>>> a = MOnumber(4)
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>>> x = MOstrPower('x', 4)
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>>> print(multiply(x, a))
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*
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> 4
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> ^
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| > x
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| > 4
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"""
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return MOMonomial(right, left)
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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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