HP calcs with X^Y function  Printable Version + HP Forums (https://archived.hpcalc.org/museumforum) + Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum1.html) + Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum2.html) + Thread: HP calcs with X^Y function (/thread14305.html) 
HP calcs with X^Y function  mapet  01172002 Most of calcs have Y^X function. Re: HP calcs with X^Y function  Thibaut.be  01172002 As far as I know, only :
have the x^y function. Is that right ?
Re: HP calcs with X^Y function  mapet  01172002 I think there are more...
Re: HP calcs with X^Y function  Ernie Malaga  01172002 Yes, there are more. The HP38G is one of them. The HP39G is another. There may be more. What's funny is that neither has an X or Yregister per se (as far as I know), so the label is meaningless anyway.
Ernie
Re: HP calcs with X^Y function  mapet  01182002 Some of the newest algebraic calcs have X^Y function. Others have Y^X. Both seems to act in the same way. So why the labels are different?
PS There is a difference betwwen x^y function and x^y label  Thibaut.be  01182002 I mean that the calcs I mentioned really calculate x^y accoding to the position of the numbers in the stack; this is not the case for the later models you mentioned...
However keep on posting some more quizzes, I really enjoy it
Re: HP calcs with X^Y function  Vieira, Luiz C. (Brazil)  01212002 Hi; This is something I did not notice so far. Yes, I agree with Thibaut: the HP35 was the first  and the only  pocket RPN with x^y. All others offered [y^x] function (and label) to agree with other noncommutative math operations, i.e.: /, , %. (Please, if the term commutative is not used this way, forgiveme and help me placing the correct one.) Say, 47 is not equal to 74, while 4+7 is equal to 7+4 (mathematical results). Raising to a power is noncommutative. Let's take this: at the moment we need 43, the sequence 4 ENTER 3 [] will give the expected result; what about 4^3? We would place 4 ENTER 3 [y^x]; if there is a [x^y] function, the sequence should be 3 ENTER 4 [x^y] (remember, x and y reffer to stackregisters X and Y). The algebraics differ for the math sequence: 4 [x^y] 3 [=] works fine, as 4 [y^x] 3 [=] is confusing for those already familiar with algebraic notation. With RPN models, the input sequence will really dictate who will be raised to who, but [y^x] will always mean [ycontents ^ xcontents]. In the new ones, y meaning level 2 argument, and x meaning level 1 argument. With the 49G, the [y^x} key adds a single [^] character, algebraic or RPN mode. Cheers.
Re: HP calcs with X^Y function  Andrés C. Rodríguez (Argentina)  01232002 If I recall correctly, the HP35 does not have an "antilog" key, so the reason to have x^y instead of y^x is to make it easy to do 10 x^y as an antilog shortcut.
