Re: Arg[z] that works with zero argument?
- To: mathgroup at smc.vnet.net
- Subject: [mg50881] Re: Arg[z] that works with zero argument?
- From: Bill Rowe <readnewsciv at earthlink.net>
- Date: Sat, 25 Sep 2004 01:55:32 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
On 9/24/04 at 4:41 AM, siegman at stanford.edu (AES/newspost) wrote:
>I'd like a simple Arg[z] function that would "work" [return some
>simple value; zero is OK] for zero argument values, even if z is a
>list.
>My simplest kludge so far is
>myArg[z_] := Module[{eps=10^(-17)}, Arg[z+eps]]
>Seems to work OK so far -- better ways to do this?
Did you try Arg[z] where z is a list?
Attributes[Arg]
{Listable, NumericFunction, Protected}
Arg[Table[Random[], {4}]]
{0, 0, 0, 0}
The attribute Listable tells you Arg will accept a list as a argument and do the right thing.
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