[R] [External] Character (1a, 1b) to numeric

[Richard M. Heiberger]

> xc <-  c("1", "1a", "1b", "1c", "2", "2a", "2b", "2c")
> xn <- c(1, 1.3, 1.5, 1.7, 2, 2.3, 2.5, 2.7)
> testdata <- rep(c("1", "1a", "1b", "1c", "2", "2a", "2b", "2c"), times=1:8)
> testdata
 [1] "1"  "1a" "1a" "1b" "1b" "1b" "1c" "1c" "1c" "1c" "2"  "2"  "2"  "2"  "2"
[16] "2a" "2a" "2a" "2a" "2a" "2a" "2b" "2b" "2b" "2b" "2b" "2b" "2b" "2c" "2c"
[31] "2c" "2c" "2c" "2c" "2c" "2c"
> ?match
> xn[match(testdata, xc)]
 [1] 1.0 1.3 1.3 1.5 1.5 1.5 1.7 1.7 1.7 1.7 2.0 2.0 2.0 2.0 2.0 2.3 2.3 2.3 2.3
[20] 2.3 2.3 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7
>

On Fri, Jul 10, 2020 at 1:51 PM Jean-Louis Abitbol <abitbol using sent.com> wrote:
>
> Dear All
>
> I have a character vector,  representing histology stages, such as for example:
> xc <-  c("1", "1a", "1b", "1c", "2", "2a", "2b", "2c")
>
> and this goes on to 3, 3a etc in various order for each patient. I do have of course a pre-established  classification available which does change according to the histology criteria under assessment.
>
> I would want to convert xc, for plotting reasons, to a numeric vector such as
>
> xn <- c(1, 1.3, 1.5, 1.7, 2, 2.3, 2.5, 2.7)
>
> Unfortunately I have no clue on how to do that.
>
> Thanks for any help and apologies if I am missing the obvious way to do it.
>
> JL
> --
> Verif30042020
>
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