plyr equivalent of statement done using mapply

Question

I'm guessing mlply should be used here for the equivalent of what I'm doing in mapply, but I'm not able to figure out how. I really would like to understand the plyr package better.

df <- data.frame(start=as.Date(c("2012-01-01","2012-02-02")),end=as.Date(c("2012-01-04","2012-02-08")))
l <- mapply(function(x,y) seq(x,y,by="day"),df$start, df$end)

Thanks in advance, --JT

score 3 · Accepted Answer · answered Jul 13 '12 at 20:59

3

I think the big difference if that you need to name your function arguments in line with the variable names in your data frame:

mlply(df,function(start,end){seq(start,end,by = "day")})

answered Jul 13 '12 at 20:59

joran

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this works too: dlply(df, .(start, end), function(ddf) seq(ddf$start,ddf$end,by="day")) – nassimhddd Jul 13 '12 at 21:10

plyr equivalent of statement done using mapply

1 Answers1