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), Sharp EL 9900 (2000), Casio FX992S (1995) 

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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