HP50g Using library functions in programs

[Joe Horn]

(12-04-2019 06:23 AM)erazor Wrote:  ... I wanted to use these functions in a formula but always get "Invalid Syntax", no matter what I try inside the ''.

None of LongFloat's commands can be used inside algebraic expressions. They are intended to be used in RPL programs in sequential order, operating on the stack. If you would like assistance turning a formula into RPN using LongFloat commands, just let us know the specific formula, and what you want to do with it (e.g. graph it, or send it to a solver, or whatever). Just keep in mind that only LongFloat's commands can handle its special "long float" object type. Attempting to feed long floats to any functions built into the 50g will error out (with a few obvious exceptions, e.g. TYPE).