Re: Maping and Complex Addition
- To: mathgroup at smc.vnet.net
- Subject: [mg56151] Re: Maping and Complex Addition
- From: Bill Rowe <readnewsciv at earthlink.net>
- Date: Sat, 16 Apr 2005 03:53:47 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
On 4/15/05 at 4:47 AM, pdesai1 at umbc.edu (Pratik Desai) wrote:
>I have a list of complex conjugate numbers , appearing as
>comp={a+b*I,a-b*I,c+d*I,c-d*I}
>I would like to create a function ConjPlus[{}] which gives me the
>real values obtained by adding the first two complex conjugate
>numbers and so on. I have been able to do it using table and plus,
>but it would be cool to just have a function you can call
>Anyway, here is what I am using
>Table[Plus@@Partition[comp,2][[q]],{q,1,j}]
This of course won't do anything useful as j is not defined. Presumably, j was defined elsewhere in you session as 2. In anycase the identical result is obtained from
Plus@@@Partition[comp,2]
and the following makes the desired function
conjPlus[x_List]:=Plus@@@Partition[x,2]
An alternative (which may run faster) would be using Total as in
conjPlus[x_List]:= Total/@Partition[x, 2]
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