For a given electrode (e.g. from a config.dat file), return the true
        node number as in self.nodes['sorted']

def get_electrode_node(self, electrode):
        """
        For a given electrode (e.g. from a config.dat file), return the true
        node number as in self.nodes['sorted']
        """
        elec_node_raw = int(self.electrodes[electrode - 1][0])
        if(self.header['cutmck']):
            elec_node = self.nodes['rev_cutmck_index'][elec_node_raw]
        else:
            elec_node = elec_node_raw - 1
        return int(elec_node)