Hi I'm trying to convert a column of strings (nominal types) to a set of boolean / binary / logical values. For example, in the column there is red, blue, green and yellow. There are 100 rows and each has a colour. I want to convert the column to 4 columns: red, blue, green,yellow and then either 1 or 0 put in the relevant row. Thanks -- View this message in context: http://r.789695.n4.nabble.com/Converting-column-of-strings-to-boolean-tp4656739.html Sent from the R help mailing list archive at Nabble.com.
domcastro wrote> Hi > > I'm trying to convert a column of strings (nominal types) to a set of > boolean / binary / logical values. For example, in the column there is > red, blue, green and yellow. There are 100 rows and each has a colour. I > want to convert the column to 4 columns: red, blue, green,yellow and then > either 1 or 0 put in the relevant row. > Thanksmaybe model.matrix will help .... # d is my understanding of your data d<-factor(c("red","green","red","blue","green","yellow","red")) model.matrix(~d -1) HTH Pete -- View this message in context: http://r.789695.n4.nabble.com/Converting-column-of-strings-to-boolean-tp4656739p4656741.html Sent from the R help mailing list archive at Nabble.com.
Hello,
Something like this?
x <- sample(c("red", "blue", "green",
"yellow"), 100, replace = TRUE)
cnames <- unique(x)
sapply(cnames, function(.x) x == .x)
Hope this helps,
Rui Barradas
Em 26-01-2013 22:25, domcastro escreveu:> Hi
>
> I'm trying to convert a column of strings (nominal types) to a set of
> boolean / binary / logical values. For example, in the column there is red,
> blue, green and yellow. There are 100 rows and each has a colour. I want to
> convert the column to 4 columns: red, blue, green,yellow and then either 1
> or 0 put in the relevant row.
> Thanks
>
>
>
> --
> View this message in context:
http://r.789695.n4.nabble.com/Converting-column-of-strings-to-boolean-tp4656739.html
> Sent from the R help mailing list archive at Nabble.com.
>
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Thanks all. I will give them all a go and let you know the outcome. kind regards -- View this message in context: http://r.789695.n4.nabble.com/Converting-column-of-strings-to-boolean-tp4656739p4656774.html Sent from the R help mailing list archive at Nabble.com.