Re: Taking the Arg of a complex number

*To*: mathgroup at smc.vnet.net*Subject*: [mg122084] Re: Taking the Arg of a complex number*From*: Jacopo Bertolotti <jacopo.bertolotti at gmail.com>*Date*: Thu, 13 Oct 2011 03:46:48 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*References*: <201110120744.DAA16295@smc.vnet.net>

From the Help page for Arg: * Arg[z] is left unevaluated if z is not a numeric quantity. Therefore what you get is exactly the expected behaviour but I admit that right now I do not know how to extract the argument of a complex number symbolically (I would try a pattern matching but I can not make aworking example for you right now). Regards Jacopo On 10/12/2011 09:44 AM, Ben wrote: > Would appreciate any help here, endless Googling has not revealed the answer to me: > > If I define a complex number symbolically, such as x = A Exp[I phi], why does Arg[x] never return the answer I expect, phi? Using Refine with the as sumptions phi is real and between 0 and 2 pi, and that A is greater than 0 doesn't seem to help. All I get is Arg[Exp[I phi]] > >

**References**:**Taking the Arg of a complex number***From:*Ben <bjgear@googlemail.com>