Re: Selecting Rows Where All Columns Satisfy a Condition
- To: mathgroup at smc.vnet.net
- Subject: [mg82636] Re: Selecting Rows Where All Columns Satisfy a Condition
- From: Bill Rowe <readnewsciv at sbcglobal.net>
- Date: Fri, 26 Oct 2007 05:32:42 -0400 (EDT)
On 10/25/07 at 6:04 AM, gregory.lypny at videotron.ca (Gregory Lypny)
wrote:
>I've got an Nx4 numeric array called X. I'd like to pull out all
>rows where -9 does not appear in any of the four columns. I know I
>can this:
>Select[X, #[[1]] != -9 && #[[2]] != -9 && #[[3]] != -9 && #[[4]] !=
=
>-9 &]
>But is there a more elegant way that applies the not-equal-to
>condition to each column without having to repeat it?
=46or this class of problem I would use DeleteCases and pattern
matching, i.e.,
DeleteCases[X,{___,-9,___}]
should do the trick.
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