masstable/masstable.py
def ds2n(self):
        """Calculates the derivative of the neutron separation energies:

        ds2n(Z,A) = s2n(Z,A) - s2n(Z,A+2)
        """
        idx = [(x[0] + 0, x[1] + 2) for x in self.df.index]
        values = self.s2n.values - self.s2n.loc[idx].values
        return Table(df=pd.Series(values, index=self.df.index, name='ds2n' + '(' + self.name + ')'))
def ds2n(self):
        """Calculates the derivative of the neutron separation energies:

        ds2n(Z,A) = s2n(Z,A) - s2n(Z,A+2)
        """
        idx = [(x[0] + 0, x[1] + 2) for x in self.df.index]
        values = self.s2n.values - self.s2n.loc[idx].values
        return Table(df=pd.Series(values, index=self.df.index, name='ds2n' + '(' + self.name + ')'))
def ds2n ( self ) : idx = [ ( x [ 0 ] + 0 , x [ 1 ] + 2 ) for x in self . df . index ] values = self . s2n . values - self . s2n . loc [ idx ] . values return Table ( df = pd . Series ( values , index = self . df . index , name = 'ds2n' + '(' + self . name + ')' ) )
Calculates the derivative of the neutron separation energies:

        ds2n(Z,A) = s2n(Z,A) - s2n(Z,A+2)
Calculates the derivative of the neutron separation energies :