Map onto a column
- To: mathgroup at smc.vnet.net
- Subject: [mg125412] Map onto a column
- From: Sly Pandemia <slypandemia at gmail.com>
- Date: Tue, 13 Mar 2012 03:02:42 -0500 (EST)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
Is there a neat way to map a function onto a specific column in an
array?
For example if I have
a = {{1,2,3},{4,5,6},{7,8,9}}
and I want to map f onto the second element in each row. I would
normally use
b = Map[MapAt[f,#,2]&,a]
but this seems a bit awkward. I would expect to be able to use
b = MapAt[f,a,{All,2}]
but this appears to be illegal syntax.
Is there any way to do what I want with a single Map/MapAt function?
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