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from .simplenode import SimpleNode
from gettext import gettext as _
class AbsoluteValue(SimpleNode):
"""Node representing the absolute value function: f(x) = abs(x)."""
CLASS = "absolutevalue"
background = SimpleNode.loadbackground("absolutevalue.svg")
title = _("Absolute Value")
description = _(u"Returns the distance a value is from zero.\n"
u"For example, f(-3) = 3 and f(3) = 3.")
def __call__(self, x):
"""Calls the absolute value function."""
return abs(x)
def get_equation_string(self, variable):
"""Returns abs(x) given variable, x."""
return "abs(%s)" % variable
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