[R] unwanted coercion using apply

From: Jeroen Ooms <jeroenooms_at_gmail.com>
Date: Sat, 21 May 2011 23:11:27 -0700 (PDT)


I need to convert a dataframe to a record-structure, to be able to encode it later in JSON. Suppose this is the data:

mydata <- data.frame(foo=1:3, bar=c("M","M","F"));

I would like to convert this to a unnamed list (json array) of key-value pairs. For example like this:

apply(data.frame(foo=1:3, bar=c("M","M","F")),1,as.list)

However, when I do this, all the numeric values are converted to strings. I don't understand why this is, because when I try to convert one record simulataniously, this does not happen:

as.list(mydata[1,]);

I am not sure if this is indended behaviour or not, but is there an elegant way to apply 'as.list' to all of the dataframe rows without coercing everything to strings?

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Received on Sun 22 May 2011 - 07:40:07 GMT

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