[R] ddply error

[jd6688]

 ddply(z, .(groupId,location),function(d)with(d,
c(startLoc=Pos[1],endLoc=Pos[length(Pos)],
peakValue=max(sumoo),other=map[1])))


startLoc=Pos[1],endLoc=Pos[length(Pos)], peakValue=max(sumoo),====numeric
value
other=map[1]===charactor value

as a result:

c(startLoc=Pos[1],endLoc=Pos[length(Pos)],
peakValue=max(sumoo),other=map[1]) ===convert all values to charactor.

my question, How can i separate the numeric and charactor values from above
statement?

Thanks,
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