RDocumentation: numeric

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if(!require('base')) {
    install.packages('base')
    library('base')
}

as.numeric(c("-.1"," 2.7 ","B")) # (-0.1, 2.7, NA)  +  warning

as.numeric(factor(5:10)) # not what you'd expect
f <- factor(1:5)
## what you typically meant and want:
as.numeric(as.character(f))
## the same, considerably (for long factors) more efficient:
as.numeric(levels(f))[f]