Reading a list of mixed type values

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Reading a list of mixed type values

Ulrike Grömping-2
Dear helpeRs,

I have a column of various different entry types denoting missing value codes
for a data frame. Elements can be numbers (e.g. 9), combinations of numbers
e.g. in the form c(0,9,99), or NULL (for no valid missing data code).

I used

   (path2, "MissingCodes.csv",sep=""),header=FALSE,
codes <- as.list(codes$V1)

to read the codes and transform them into a list, which unfortunately is a
list of character entries:

codes <- as.list(c("NULL", "9", "999", "c(0,9)", "c(999,99)"))
### reproducible mini version of what I get

I do not know how to transform these to the numeric versions I need. With

codesnum<-lapply(codes,function(obj){if (!
    as.double(obj) else { if (obj=="NULL") NULL
    else obj)}})

I can handle everything but the "c(0,9)" type characters. I have without
success tried various ways to get these into numeric versions (c(0,9)).
Any suggestions ? There might even be something quite simple around?

Thanks and regards, Ulrike

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