Yup, I worked it out in time... for future reference, as.matrix calls

`format` on logicals, converting them to the form seen.

On Sat, 4 Aug 2018 at 17:53, Berry, Charles <

[hidden email]> wrote:

>

>

> > On Aug 4, 2018, at 6:55 AM, David Hugh-Jones <

[hidden email]>

> wrote:

> >

> > I'm not sure why this is happening:

> >

> > tmp <- data.frame(

> > a = letters[1:2],

> > b=c(TRUE, FALSE),

> > stringsAsFactors = FALSE

> > )

> > idx <- matrix(c(1, 2, 2, 2), 2, byrow = TRUE)

> > tmp[idx]

> >

> > [1] " TRUE" "FALSE"

> >

>

> From ?"[.data.frame"

>

> Extract.data.frame {base}

> .

> .

> .

> Matrix indexing (x[i] with a logical or a 2-column integer matrix i) using

> [ is not recommended. For extraction, x is first coerced to a matrix.

>

> [...]

>

> Thus, something like

>

> as.matrix(tmp)

>

> happens converting every column to character. Dig deeper by reading

>

> ?matrix

>

> and see the paragraph on `as.matrix' under `Details'.

>

> HTH,

>

> Chuck

>

--

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