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From: Merciadri Luca on 29 Apr 2010 16:02
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Hi,

Yesterday, I came up with complex calculations with complex
numbers. That was for alternating currents, and I used my HP 50g
hoping that it could simplify fractions of fractions of fractions of
complex numbers. But asking for `SIMPLIFY' only gave me the reduced
fraction (i.e. a fraction with two members, a normal fraction), still
with complex numbers at the denominator, and I would have liked to see
only complex numbers at the numerator. Is there somebody out there who
likes complex denominators? There are many ways to get rid of them,
and, habitually, one multiplies both parts of the fraction by the
complex conjugate. For example, a trivial example is, according to the
fact that i is the imaginary unit:

1/(1-i)=1(1+i)/((1-i)(1+i))=(1+i)/(2).

Why does my HP 50g never simplify such expressions into my desired
form (i.e. the one where there are only complex numbers at the
numerator)? This is a practical issue.

Thanks.


- --
Merciadri Luca
See http://www.student.montefiore.ulg.ac.be/~merciadri/
- --

The dog is nude though the clothing cost a penny.
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From: Joe Horn on 29 Apr 2010 17:29
> 1/(1-i)=1(1+i)/((1-i)(1+i))=(1+i)/(2).
>
> Why does my HP 50g never simplify such expressions into my desired
> form (i.e. the one where there are only complex numbers at the
> numerator)? This is a practical issue.

Strange! My HP 50g *does* simplify 1/(1-i) to (1+i)/2 using SIMPLIFY,
and even using EVAL. This even happens with all the flags in their
default states. Try resetting your flags. To do this in RPN mode,
type 66.02 MENU and then press the RESET menu key. This will turn on
algebraic mode; press MODE +/- ENTER to return to RPN mode. If you
keep your machine in algebraic mode (heaven forbid), type MENU(66.02)
and then press the RESET menu key. If that doesn't help, please
advise.

-Joe-
From: Veli-Pekka.Nousiainen on 30 Apr 2010 07:54
Joe Horn wrote:
>> 1/(1-i)=1(1+i)/((1-i)(1+i))=(1+i)/(2).
>>
>> Why does my HP 50g never simplify such expressions into my desired
>> form (i.e. the one where there are only complex numbers at the
>> numerator)? This is a practical issue.
>
> Strange! My HP 50g *does* simplify 1/(1-i) to (1+i)/2 using SIMPLIFY,
> and even using EVAL. This even happens with all the flags in their
> default states. Try resetting your flags. To do this in RPN mode,
> type 66.02 MENU and then press the RESET menu key. This will turn on
> algebraic mode; press MODE +/- ENTER to return to RPN mode. If you
> keep your machine in algebraic mode (heaven forbid), type MENU(66.02)
> and then press the RESET menu key. If that doesn't help, please
> advise.
>
> -Joe-
or try CASCFG command
From: Merciadri Luca on 30 Apr 2010 11:19
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Thanks for your answers. It works in RPN but not in ALG mode. Wierd!

- --
Merciadri Luca
See http://www.student.montefiore.ulg.ac.be/~merciadri/
- --

Something is better than nothing.
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From: Mike Bryant on 1 May 2010 11:27
On Apr 30, 8:19 am, Merciadri Luca <Luca.Mercia...(a)student.ulg.ac.be>
wrote:
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> Hash: SHA1
>
> Thanks for your answers. It works in RPN but not in ALG mode. Wierd!
>
> - --
> Merciadri Luca
> Seehttp://www.student.montefiore.ulg.ac.be/~merciadri/
> - --
>
> Something is better than nothing.
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>
> iEYEARECAAYFAkva9OkACgkQM0LLzLt8MhwvzACaA9MDbocfVtNM5k/MeHR4tXzV
> z1MAni+83vT7FXWRrcY9SbAFtimeGoNk
> =Jju3
> -----END PGP SIGNATURE-----

hmmm Mine works in either RPN or ALG mode
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