39GII bug in complex exponential



#2

Hi all,

I just got and my 39GII (firmware from May 9th).

I was puzzled to enter: e^i and to get: 1+0*i; actually I get the same answer with e^(x*i), x being any number.

I am ever more puzzled after I read a thread where Tim gave different (and correct) results.

Is there a new firmware that I'm not aware of ? Is it a bug ? or just my machine ??

Thanks and cheers,

Vincent


#3

I have an Aug 23, 2012 firmware version. The accompanying emulator gives the correct answer to e^i. Ask Tim how to get the new firmware version.

Namir

#4

Mine has the same firmware and behaves in the same way.

My copy of the emulator, with firmware date string 2012/07/10, behaves much better and returns -1 - 1.26676153736E-12*i when computing e^(i*pi) - which is something like -1.

I would like that firmware installed on my hardware HP39GII but have no means to upload it.


#5

A little bird told me to wait just a little bit more...

TW

#6

I'm starting to consider that these two widely known papers should be widely read...

* T. E. Hull, Thomas F. Fairgrieve, Ping Tak Peter Tang, “Implementing Complex Elementary Functions Using Exception Handling”, ACM Transactions on Mathematical Software, Volume 20 (1994), pp 215–244, Corrigenda, p553

Check p. 231 for CEXP algorithm.

(for free ftp://ftp.cs.utoronto.ca/na/reports/cmplx-elem-fcns.ps.gz)

** T. E. Hull, Thomas F. Fairgrieve, Ping Tak Peter Tang, “Implementing the Complex Arcsine and Arccosine Functions Using Exception Handling”, ACM Transactions on Mathematical Software, Volume 23 (1997) pp 299–335

Now, that's nice...


Edited: 5 Sept 2012, 9:25 a.m.


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