blob: 120318fda244b2385ca5403fe1057f3330f96937 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
|
# coding=utf-8
from .node import Node
from .binaryoperator import BinaryOperator
from gettext import gettext as _
class Composition(BinaryOperator):
"""Composition: left compose right function."""
CLASS = "composition"
background = BinaryOperator.loadbackground("composition.svg")
title = _("Function Composition")
description = _(u"Combines two functions by applying the result of the "
u"right function to the left.\n"
u"For example, (x ** 2) ∘ (x + 1) = (x + 1) ** 2.")
def __call__(self, x):
"""Returns self's leftchild(rightchild(x))."""
return self.children[0](self.children[1](x))
def get_equation_string(self, variable):
"""Returns a string representing the current equation."""
# result from right will be new variable in left
variable = Node.get_equation_string(self.children[1], variable)
return Node.get_equation_string(self.children[0], variable)
|
