[R] selecting subsets of data from matrix
Ben Bolker
bolker at zoo.ufl.edu
Mon Oct 20 20:05:34 CEST 2003
x[x[,20]<45 | x[,20]>315, ]
On Mon, 20 Oct 2003, Laura Quinn wrote:
> Probably a stupid question, but I don't seem to be able to find the answer
> I'm looking for from any of the R literature. Basically I have a matrix
> with several thousand rows and 20 columns(weather stations) of wind
> direction data.
>
> I am wanting to extract a matrix which contains data for all columns
> conditional on column 20 having a value of _either_ less than 45 or
> greater than 315. (ie I want to extract a matrix which contains wind direction
> data for all columns {weather stations} when there is a prevailing
> northerly wind for one of the stations).
>
> I have tried a few different methods of doing this, none with any success,
> can anyone please advise?
>
> Thanks in advance!
>
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