Re: [R] subset() multiple arguments

From: Duncan Murdoch <murdoch_at_stats.uwo.ca>
Date: Mon, 07 Jul 2008 15:27:59 -0400

On 7/7/2008 3:19 PM, stephen sefick wrote:
> This is what I would like to do and it works just fine. Is there a way to
> shorten this code so I don't have to subset a subset of a subset?
>
> d<-subset(subset(subset(subset(x, River.Mile<=202), River.Mile>3),
> Lagrangian=="Yes"), EventType=="Regular")

You can combine logical tests using &:

d <- subset(x, (River.Mile<=202) & (River.Mile>3) & (Lagrangian=="Yes") & (EventType=="Regular"))

(The parentheses around the tests are not necessary, but they mean you don't need to check the operator precedence table, and your test would work in some other language with different rules.)

Duncan Murdoch



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