RationalFunctionSign RΒΆ

sign.spad line 89

Find the sign of a rational function around a point or infinity.

sign: (Fraction Polynomial R, Symbol, Fraction Polynomial R, String) -> Union(Integer, failed)
sign(f, x, a, s) returns the sign of f as x nears a from the left (below) if s is the string "left", or from the right (above) if s is the string "right".
sign: (Fraction Polynomial R, Symbol, OrderedCompletion Fraction Polynomial R) -> Union(Integer, failed)
sign(f, x, a) returns the sign of f as x approaches a, from both sides if a is finite.
sign: Fraction Polynomial R -> Union(Integer, failed)
sign f returns the sign of f if it is constant everywhere.