[R] unwanted coercion using apply

[Jeroen Ooms]

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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