Casio fx29  how to enter "y"

12052018, 07:29 AM
Post: #1




Casio fx29  how to enter "y"
Today I noticed my partner pull out an old Casio fx29 calculator that I didn't know she had!
Here is a photo I found on a website of this calculator. Needless to say I immediately had a play. I liked the keyboard feel and the glowing blue display. The time it took to calculate SIN was longer than I thought  about a second. I'm sure HP was never that slow!? Then I hit the main stumbling block  how to do x^y. I can't find a manual online and not sure how to enter a second number before pressing the x^y key. Can anyone please give me a hint on how to drive this thing? P.S. Relatedly, found this interesting article about operator precedence in Casio's calculator design history. 

12052018, 07:43 AM
Post: #2




RE: Casio fx29  how to enter "y"
(12052018 07:29 AM)tcab Wrote: Today I noticed my partner pull out an old Casio fx29 calculator that I didn't know she had! Isn't it [x] x^y [y] = ? I have one at home, could check this evening... Greetings, Massimo +×÷ ↔ left is right and right is wrong 

12052018, 07:53 AM
Post: #3




RE: Casio fx29  how to enter "y"
Yes that seems to work  thanks. What confused me was when I enter a number then hit the x^y key the calculator does something to the number and changes it. E.g. "2 x^y" gives me 0.6931 (confusing!) and when I keep going and hit "4 =" then finally I get the answer 16.
What is 0.6931 supposed to mean? Seems you have to ignore the intermediate number and just press on with the key sequence. Entering different x values followed by x^y give different "intermediate" numbers. Very confusing. 

12052018, 07:58 AM
Post: #4




RE: Casio fx29  how to enter "y"
0.6931 is approximately ln 2
Greetings, Massimo +×÷ ↔ left is right and right is wrong 

12052018, 08:53 AM
Post: #5




RE: Casio fx29  how to enter "y"
Fascinating. I just crunched a series of numbers on the Casio fx29, and indeed, pressing NUM x^y is the same as pressing NUM ln.
I wonder what the relationship between ln and x^y is, such that the calculator feels the need to do this... 

12052018, 09:02 AM
Post: #6




RE: Casio fx29  how to enter "y"  
12052018, 01:00 PM
Post: #7




RE: Casio fx29  how to enter "y"
I never had a fx29, but I'm pretty sure I had a fx39 at some point during my school years. I don't remember seeing any strange behaviour for the x^y key so I guess they changed it between the fx29 and fx39, although I no longer have the calculator to check.
— Ian Abbott 

12052018, 02:31 PM
(This post was last modified: 12052018 02:33 PM by Albert Chan.)
Post: #8




RE: Casio fx29  how to enter "y"
(12052018 01:00 PM)ijabbott Wrote: I never had a fx29, but I'm pretty sure I had a fx39 at some point during my school years. Any AOS calculator that had [X<>Y] key cannot assume x^y = exp(y * ln(x)). It had to wait until [=] key is pressed (or other operators, say +  x /) So, based on googled fx39 pictures, you will not see ln(x) intermediates. 

12052018, 06:04 PM
(This post was last modified: 12052018 06:06 PM by edryer.)
Post: #9




RE: Casio fx29  how to enter "y"
Quote:The time it took to calculate SIN was longer than I thought  about a second. I'm sure HP was never that slow!? Interesting no factorial function, probably as this was an entry level Scientific, however I believe this was on the FX501P (likely +1 years, 1979) but not the later fx29 equivalent (likely the FX80 +12 years). 69! was very slow on the early TI's that had the function, likely the Casio and HP's as well. HP28S (1988 US model), DM41X (2020) 

12052018, 11:31 PM
(This post was last modified: 12052018 11:34 PM by ijabbott.)
Post: #10




RE: Casio fx29  how to enter "y"
(12052018 02:31 PM)Albert Chan Wrote:(12052018 01:00 PM)ijabbott Wrote: I never had a fx29, but I'm pretty sure I had a fx39 at some point during my school years. Actually, it might have been an fx110 I had, which was similar to the fx39, but with extra digits on the display, and the angle/sd mode switch in a different place. EDIT: Probably not though, because I don't remember mine having a dB conversion function. I've not seen a dedicated dB conversion function on a calculator before! — Ian Abbott 

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