[R] Why is.integer() doesn't work with single values?

[Mark Myatt]

Sven Garbade <garbade at psy.uni-muenchen.de> writes:
>Hi all,
>
>I don't understand the behavior of is.integer():
>
>> x <- integer()
>> is.integer(x)
>[1] TRUE
>> x <- 10
>> is.integer(x)
>[1] FALSE
>> x <- 1:10
>> is.integer(x)
>[1] TRUE
>
>Why is.interger() returns FALSE if x has only one element? And how can
>someone check if x is an integer but contains only one value? (R 1.5.0
>on Linux i386)

That is down to the storage mode. Try:

        x <- 10
        typeof(x)

        y <- 1:10
        typeof(y)

You can test with:

        x == as.integer(x)

Mark

--
Mark Myatt


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