LDO controlled with digipot

This is in regards to Ron's circuit posted here: http://forum.allaboutcircuits.com/threads/0-57v-voltage-control-using-a-digital-pot.26927/\


If I wanted to use the negative version, LM337, would the only thing to change be the Q1 follower polarity?

Does the transfer function still work with the opamp in non-inverting configuration for negative regulator?

Thanks again Ron for providing the circuit.



Regards

Tim