logₓy

[cdmackay]

thanks both,

(01-12-2019 10:42 PM)Benjer Wrote:  I was having the opposite problem the other day trying to (somewhat quickly) take the log_10 of some number on a Casio fx-991EX, but the button I was using required an argument for the base and I thought it strange there'd be a button for that but not one for log_10. I did ultimately find it as a shifted function on the (-) key. At the time I thought it interesting that logₓy had its own button but log_10 didn't.

yup, it's not even a shifted fn there, but the main key fn.

(01-12-2019 10:49 PM)Valentin Albillo Wrote:  The HP-71B has several log functions (some in the mainframe and some in various ROMs), including LOG2(X) which admittedly is very handy for all sort of programming tasks.

I also think that the HP-75 had a general Log to any base, not sure if in the mainframa or perhaps in some ROM or other.

I'll add one of those to my wish-list