(self, argindex=1)
Get the first derivative of the argument to Abs().

        Examples
        ========

        >>> from sympy.abc import x
        >>> from sympy.functions import Abs
        >>> Abs(-x).fdiff()
        sign(x)
Get the first derivative of the argument to Abs().
Get the first derivative of the argument to Abs () .
def fdiff(self, argindex=1):
        """
        Get the first derivative of the argument to Abs().

        Examples
        ========

        >>> from sympy.abc import x
        >>> from sympy.functions import Abs
        >>> Abs(-x).fdiff()
        sign(x)
        """
        if argindex == 1:
            return sign(self.args[0])
        else:
            raise ArgumentIndexError(self, argindex)
def fdiff ( self , argindex = 1 ) : if argindex == 1 : return sign ( self . args [ 0 ] ) else : raise ArgumentIndexError ( self , argindex )