Re: Part
- To: mathgroup at smc.vnet.net
- Subject: [mg2898] Re: [mg2890] Part
- From: Preston Nichols <nichols at godel.math.cmu.edu>
- Date: Tue, 9 Jan 1996 02:16:24 -0500
Hans Steffani wrote: > w={{1,2,3},{4,5,6},{7,8,9}} > npos={2,1} > > npos is the position of the element I need. > > w[[npos]] > > does not work, as it returns the second and the first > line. Both Dave Wagner[mg2895] and Ross Moore[mg2894] proposed w[[Sequence @@ npos]] as a solution, which looks good to me (except for the usual generic misgivings one might have about using an undocumented command such as Sequence). However, my first thought was to use w[[##]]& @@ npos which also seems to work (though it looks dangerously like a cartoon expletive). Can anyone comment on the difference between these? Are there any serious reasons to prefer one over the other, or is it just a matter of taste? Preston Nichols Department of Mathematics Carnegie Mellon University ==== [MESSAGE SEPARATOR] ====