(self, argindex=1)
Returns the first derivative of this function.
Returns the first derivative of this function.
Returns the first derivative of this function .
def fdiff(self, argindex=1):
        """
        Returns the first derivative of this function.
        """
        if argindex == 1:
            return self
        else:
            raise ArgumentIndexError(self, argindex)
def fdiff ( self , argindex = 1 ) : if argindex == 1 : return self else : raise ArgumentIndexError ( self , argindex )