storing expressions between successive runs of the same notebook

*To*: mathgroup at smc.vnet.net*Subject*: [mg115653] storing expressions between successive runs of the same notebook*From*: Alan Ford <fabio.sattin at igi.cnr.it>*Date*: Mon, 17 Jan 2011 05:41:02 -0500 (EST)

Hi, I am sure it is a trivial question, but I cannot get out of it: I have written a notebook that loads some data and returns it output in the form of a function Y(x). You may think of Y as a sort of fit of the data. It is not, but that is not relevant. Now, after having run the notebook a first time, I need to redo the same calculations on a different set of data. Thus, eventually get a new Y'(x). The problem is: I want to retain both Y(x) and Y'(x), so as to compare them. In a standard notebook evaluation, all definitions are overwritten each time I run the notebook so, at the end of the second iteration Y(x) takes the same expression as Y'(x), while I want to have distinct expressions. I am aware that a solution would be reformatting the notebook as a do- loop, but I would rather keeping it in its run-once form. Any suggestions ? Thanks Fabio