Re: Mapping and AppendTo
- To: mathgroup at smc.vnet.net
- Subject: [mg91758] Re: Mapping and AppendTo
- From: Albert Retey <awnl at gmx-topmail.de>
- Date: Sun, 7 Sep 2008 05:37:15 -0400 (EDT)
- References: <g9qimb$4fg$1@smc.vnet.net> <200809051113.HAA11749@smc.vnet.net> <g9t6op$jaj$1@smc.vnet.net>
Hi,
> I would like mix use of Map and AppendTo in the following way (e.g.):
>
> M = {{0,1,2},{4,5,6,7}};
> AppendTo[#,8]&/@M;
>
> Of course, this doesn't work, because {0,1,2} is not a symbol name,etc.
> Is there a way to use Hold or Sow to make this construct work?
Do you have a good reason to use AppendTo? With Append you just do:
m = {{0,1,2},{4,5,6,7}};
m = Append[#,8]&/@m;
this seems to be more efficient than anything that uses AppendTo as well...
hth,
albert
- References:
- Re: Magnetic field for a straight conductor with finite length -
- From: Jean-Marc Gulliet <jeanmarc.gulliet@gmail.com>
- Re: Magnetic field for a straight conductor with finite length -