def as_leading_term(self, *symbols):
"""
Returns the leading term.
Example:
>>> from sympy.abc import x
>>> (1+x+x**2).as_leading_term(x)
1
>>> (1/x**2+x+x**2).as_leading_term(x)
x**(-2)
Note:
self is assumed to be the result returned by Basic.series().
"""
from sympy import powsimp
if len(symbols)>1:
c = self
for x in symbols:
c = c.as_leading_term(x)
return c
elif not symbols:
return self
x = sympify(symbols[0])
assert x.is_Symbol, `x`
if not self.has(x):
return self
obj = self._eval_as_leading_term(x)
if obj is not None:
return powsimp(obj, deep=True, combine='exp')
raise NotImplementedError('as_leading_term(%s, %s)' % (self, x))
def as_leading_term(self, *symbols):
"""
Returns the leading term.
Example:
>>> from sympy.abc import x
>>> (1+x+x**2).as_leading_term(x)
1
>>> (1/x**2+x+x**2).as_leading_term(x)
x**(-2)
Note:
self is assumed to be the result returned by Basic.series().
"""
from sympy import powsimp
if len(symbols)>1:
c = self
for x in symbols:
c = c.as_leading_term(x)
return c
elif not symbols:
return self
x = sympify(symbols[0])
assert x.is_Symbol, `x`
if not self.has(x):
return self
obj = self._eval_as_leading_term(x)
if obj is not None:
return powsimp(obj, deep=True, combine='exp')
raise NotImplementedError('as_leading_term(%s, %s)' % (self, x))
def as_leading_term(self, *symbols):
if len(symbols)>1:
c = self
for x in symbols:
c = c.as_leading_term(x)
return c
elif not symbols:
return self
x = Basic.sympify(symbols[0])
assert isinstance(x, Basic.Symbol),`x`
if not self.has(x):
return self
expr = self.expand(trig=True)
obj = expr._eval_as_leading_term(x)
if obj is not None:
return obj
raise NotImplementedError('as_leading_term(%s, %s)' % (self, x))
