Derivatives on HP 42S

08202018, 10:57 PM
Post: #4




RE: Derivatives on HP 42S
Hi Thomas,
When I try to XEQ the function in it's own little program, say "FX" within the derivative program sandwiched between the 2 complex commands, the correct answer is returned with a minute complex component. (I wish to have the function that I am finding the extremum point as it's own program that the derivative program can call...this allows me to then run the function program to evaluate f(x) of the extremum) I can then do a switch of x and y stack levels, but was wondering why I cannot simply get the real part of the extremum to be delivered to the x stack level. Richard 

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