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-   -   Bugs in apple calculator (https://www.mersenneforum.org/showthread.php?t=15593)

 diep 2011-05-10 00:02

Bugs in apple calculator

hi,

I noticed it a lot already. Bugs in the apple calculator at my macbookpro. I have os/x 10.4.11

First how it goes correct. I type in manual by mouse:

10 Y^X 1.24 = 17.....

Now when it goes wrong. I give in 2048^2 * 42 then take log of that,
divided by 2048^2 and the log of that. This gives 1.245....

I store that with M+

Then i give in by hand 10 Y^X MR = 101

I give C to clear screen. Give in 10. to the power MR (1.245...) again 101 as answer.

Maybe not calculate your mortgage with apple sirs!

Regards,
Vincent

 science_man_88 2011-05-10 00:07

[QUOTE=diep;260952]hi,

I noticed it a lot already. Bugs in the apple calculator at my macbookpro. I have os/x 10.4.11

First how it goes correct. I type in manual by mouse:

10 Y^X 1.24 = 17.....

Now when it goes wrong. I give in 2048^2 * 42 then take log of that,
divided by 2048^2 and the log of that. This gives 1.245....

I store that with M+

Then i give in by hand 10 Y^X MR = 101

I give C to clear screen. Give in 10. to the power MR (1.245...) again 101 as answer.

Maybe not calculate your mortgage with apple sirs!

Regards,
Vincent[/QUOTE]

first of all what type of log I can't figure it out.

 science_man_88 2011-05-10 00:27

[QUOTE=science_man_88;260955]first of all what type of log I can't figure it out.[/QUOTE]

figured out what was mean't in the log part I think.

 Christenson 2011-05-10 02:05

[QUOTE=diep;260952]hi,

I noticed it a lot already. Bugs in the apple calculator at my macbookpro. I have os/x 10.4.11

First how it goes correct. I type in manual by mouse:

10 Y^X 1.24 = 17.....

Now when it goes wrong. I give in 2048^2 * 42 then take log of that,
divided by 2048^2 and the log of that. This gives 1.245....

I store that with M+

Then i give in by hand 10 Y^X MR = 101

I give C to clear screen. Give in 10. to the power MR (1.245...) again 101 as answer.

Maybe not calculate your mortgage with apple sirs!

Regards,
Vincent[/QUOTE]
Doesn't duplicate on WinXP Calculator 5.1. Please indicate that you are dividing by log10(2048^2), should get 17.583....

 Batalov 2011-05-10 02:23

FWIW, it is easy to confuse a dumb and clever design.

-- Example! ([SIZE=1]in voice of Julius and Vincent from Pulp Fiction[/SIZE])
In Win calc, try typing 2+3*5 =>
you will get 17 in scientific mode, but 25 in standard mode.
Is that dumb? Not necessarily!

In some (or most?) modes log button is treated as an immediate postfix to the number on the screen. This makes possible to do 5 * 3 <log> where log will be applied to 3 only.

However, I have no Mac to test if this applies to your problem. ymmv.

 Christenson 2011-05-10 02:33

I loved having my result erased when I switched to scientific mode to get the log function in Win Calc!

 science_man_88 2011-05-10 19:44

[QUOTE=Christenson;260968]Doesn't duplicate on WinXP Calculator 5.1. Please indicate that you are dividing by log10(2048^2), should get 17.583....[/QUOTE]

I only figured the log part as:

[CODE](14:42)>log(2048^2*42)/log(2048^2)
%181 = 1.245105337399034558586168557[/CODE]

just to note this should work out to the 1.24... for any log base but I still don't know the rest.

[QUOTE=Batalov;260971]FWIW, it is easy to confuse a dumb and clever design.

-- Example! ([SIZE=1]in voice of Julius and Vincent from Pulp Fiction[/SIZE])
In Win calc, try typing 2+3*5 =>
you will get 17 in scientific mode, but 25 in standard mode.
Is that dumb? Not necessarily!
[/QUOTE]Scientific mode has operator precedence by default??? Can't see that in Help. Since I don't trust non-RPN grouping, I've always used = and (), so never encountered that before.