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with(airquality, subset(Ozone, Temp > 80))
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with(airquality, subset(Ozone, Temp > 80))
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## sometimes requiring a logical 'subset' argument is a nuisance
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## sometimes requiring a logical 'subset' argument is a nuisance
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nm <- rownames(state.x77)
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nm <- rownames(state.x77)
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start_with_M <- nm \%in\% grep("^M", nm, value=TRUE)
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start_with_M <- nm \%in\% grep("^M", nm, value = TRUE)
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subset(state.x77, start_with_M, Illiteracy:Murder)
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subset(state.x77, start_with_M, Illiteracy:Murder)
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# but in recent versions of R this can simply be
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# but in recent versions of R this can simply be
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subset(state.x77, grepl("^M", nm), Illiteracy:Murder)
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subset(state.x77, grepl("^M", nm), Illiteracy:Murder)
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}
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}
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\keyword{manip}
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\keyword{manip}