have figured out a few already (ln(x), log(x), x^y, sin(x), asin(x), sinh(x), asinh(x), sqrt(x), pi(x), exp(x) ) but a complete list would be very useful. At the moment I am trying to figure out if it can handle factorials (x!). Any ideas? I am using LV6i.All of the functions are listed in the help file. Select Contents and Index from the help menu, select index, type formula nodes, and then select functions and descriptions.