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WP 34S bug
10-05-2019, 02:46 AM
Post: #1
WP 34S bug
A bug was reported a while back where the factorial of complex numbers with negative real components was incorrect:

Code:
WP34S emulator: (-6.2-7.6i)! = -20.3658 + i1.2046
WolframAlpha:   (-6.2-i7.6)! = -9.8594e-11 + i3.2965e-12

This was the result of two errors in the gamma function reflection formula and impacts all functions that rely on this:
  • complex Beta
  • complex Combinations
  • complex Factorial
  • complex Gamma
  • complex LnBeta
  • complex LnGamma
  • complex Permutations

Fixes have been pushed to the sourceforge repository.

I expect that new firmware images will be built when those how do that get around to it. Don't hold your breath.


Pauli
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10-05-2019, 07:46 AM (This post was last modified: 10-05-2019 10:30 AM by Jaco@cocoon-creations.com.)
Post: #2
RE: WP 34S bug
(10-05-2019 02:46 AM)Paul Dale Wrote:  A bug was reported a while back where the factorial of complex numbers with negative real components was incorrect:

Code:
WP34S emulator: (-6.2-7.6i)! = -20.3658 + i1.2046
WolframAlpha:   (-6.2-i7.6)! = -9.8594e-11 + i3.2965e-12

This was the result of two errors in the gamma function reflection formula and impacts all functions that rely on this:
  • complex Beta
  • complex Combinations
  • complex Factorial
  • complex Gamma
  • complex LnBeta
  • complex LnGamma
  • complex Permutations

Fixes have been pushed to the sourceforge repository.

I expect that new firmware images will be built when those how do that get around to it. Don't hold your breath.


Pauli

Thanks for spending the time to support this (your) great project!

I really like this little one. I have one each of 31S, 34S, 34C and 34C-eRPN.
The 34C-eRPN model is my go-to unit. I did buy batteries in bulk ;-)

Now to update my fleet.
J

Edited my typo: corrected ā€˜31Sā€™.
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10-05-2019, 09:42 AM
Post: #3
RE: WP 34S bug
Please wait for the images to be updated (which will take however long it takes).

I really appreciate your support for the project.


Pauli
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