def ilength(self, s, s_tol=ILENGTH_S_TOL, maxits=ILENGTH_MAXITS,<EOL>error=ILENGTH_ERROR, min_depth=ILENGTH_MIN_DEPTH):
return inv_arclength(self, s, s_tol=s_tol, maxits=maxits, error=error,<EOL>min_depth=min_depth)<EOL>
Returns a float, t, such that self.length(0, t) is approximately s.
        See the inv_arclength() docstring for more details.