[Date Index]
[Thread Index]
[Author Index]
R: complex conjugation by star
*To*: mathgroup at smc.vnet.net
*Subject*: [mg132607] R: complex conjugation by star
*From*: "Brambilla Roberto Luigi (RSE)" <Roberto.Brambilla at rse-web.it>
*Date*: Sun, 20 Apr 2014 04:46:13 -0400 (EDT)
*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com
*Delivered-to*: l-mathgroup@wolfram.com
*Delivered-to*: mathgroup-outx@smc.vnet.net
*Delivered-to*: mathgroup-newsendx@smc.vnet.net
*References*: <20140418054638.0964A6A15@smc.vnet.net>
Dear Dave,
many thanks again.
Now I have the problem to tell Mathematica that same variables are reals and have not to be 'starred' so that
(x+Iy+z)* is not x*+Iy*+z* but x-Iy+z* (if x and y are reals and z unknown. Command like Element[x, Reals]
does not work.
Sincerely yours Roberto
-----Messaggio originale-----
Da: Dave Snead [mailto:dsnead6 at charter.net]
Inviato: venerd=EC 18 aprile 2014 09:30
A: Brambilla Roberto Luigi (RSE); mathgroup at smc.vnet.net
Oggetto: Re: complex conjugation by star
Rob --
This will give you what you want:
SuperStar[f_?NumberQ]:=Conjugate[f]
SuperStar[f:_[___]]:=SuperStar/@f
Cheers,
Dave Snead
-----Original Message-----
From: Brambilla Roberto Luigi (RSE)
Sent: Thursday, April 17, 2014 10:46 PM
To: mathgroup at smc.vnet.net
Subject: [mg132607] complex conjugation by star
I have defined the following useful star complex-conjugation (common star exponent notation)
f_*:=f/.Complex[u_,v_]->Complex[u,-v]
and it works fine. For example BesselJ[2,x+I y]* gives BesselJ[2,x-I y] etc. ..(x,y defined/undefined).
Also it is listable on number lists
{1+i2, 5+i6}* gives {1-i2, 5-i6} .
Unfortunately it does not work on symbols, i.e.
A* gives A even if I have defined A as a complex number by means of Element[A, Complexes].
Similarly if I define Element[{A,B,G}, Complexes]
{A,B,G}* gives {A,B,G} and (A+B+G)* gives A+B+G.
I'd like to obtain {A*,B*,G*} and A*+B*+G* ( ! )
Is it possible to fix this deficiency, unpleasant in manipulating general expressions where is not known if symbols represent real or complex variables?
Many thanks!
Rob
Prev by Date:
**Re: complex conjugation by star**
Next by Date:
**Re: complex conjugation by star**
Previous by thread:
**Re: complex conjugation by star**
Next by thread:
**Re: complex conjugation by star**
| |