Re: complex numbers
- To: mathgroup at smc.vnet.net
- Subject: [mg105908] Re: [mg105904] complex numbers
- From: Murray Eisenberg <murray at math.umass.edu>
- Date: Thu, 24 Dec 2009 20:58:59 -0500 (EST)
- Organization: Mathematics & Statistics, Univ. of Mass./Amherst
- References: <200912240516.AAA25894@smc.vnet.net>
- Reply-to: murray at math.umass.edu
Such questions have been addressed many times before in this group. You DON'T tell Mathematica in advance that x and y are to be real. Rather, when you want them to be interpreted as such, use ComplexExpand. Thus: z ComplexExpand[Re[z]] x ComplexExpand[Abs[z]] Sqrt[x^2 + y^2] Jon Joseph wrote: > All: Something fundamental about complex number initialization I am > failing to understand. I wish to define a complex number > > z=x+ I y where x and y are both reals. Can someone tell me the > proper way to tell Mathematica that x, y are real so that Re[z] returns > x and Im[z] returns y? Much appreciated, Jon. -- Murray Eisenberg murray at math.umass.edu Mathematics & Statistics Dept. Lederle Graduate Research Tower phone 413 549-1020 (H) University of Massachusetts 413 545-2859 (W) 710 North Pleasant Street fax 413 545-1801 Amherst, MA 01003-9305
- References:
- complex numbers
- From: Jon Joseph <josco.jon@gmail.com>
- complex numbers