ln() vs. log()

[jebem]

(04-19-2016 05:33 AM)Joe Horn Wrote:  

(04-18-2016 04:38 PM)Csaba Tizedes Wrote:  I'm a mechanical, so I believe that the HP32SII keyboard is the only one which is designed for the engineering calculations:

LN() and EXP() as primary(!) function,
Y^X and 1/X also as primary(!) functions.

By that criterion, the HP33s is a real winner; it not only has all four of those functions on primary keys, but has them all together as the first 4 keys on the top row! The HP-97 also has them on primary keys. Do any other models?

The amazing HP-20S and HP-21S calculators also have those four functions \(e^x\), \(LN\), \(y^x\) and \(1/x\) in the same exact positions as the HP-32SII.
In fact they have all the top row six primary functions identical to the 32SII:
\(\sqrt(x)\), \(e^x\), \(LN\), \(y^x\), \(1/x\), and \(\sum\)

Also the even more amazing HP-27S have those four functions as primary keys at the top row starting at column 3 thru 6.
It also has the \(\sqrt(x)\) at the same position as the 32SII in column 1.

I say they are all amazing because they are pure Algebraic instead of the regular RPN found in almost all of the HP machines

Edited to add this:
Let us not forget the venerable HP-35!
It has those functions as primary keys as well, despite being at different positions when compared to the 32SII.