How to send arguments into transform function in R -

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i trying create following function: 

mysplit_col <- function(df, colname, sepstr=':',                         firstname='part1', secondname='part2'){     df_split<- strsplit(as.character(df[,colname]), split=sepstr)     transform(df, firstname= sapply(df_split, "[[", 1),secondname= sapply(df_split, "[[", 2)) }  > mydf   name position 1  hla   1:1-15 2  hla   1:2-16 3  hla   1:3-17  > dput(mydf) structure(list(name = structure(c(1l, 1l, 1l), .label = "hla", class = "factor"),      position = structure(1:3, .label = c("1:1-15", "1:2-16",      "1:3-17"), class = "factor")), .names = c("name", "position" ), class = "data.frame", row.names = c("1", "2", "3"))  > mysplit_col_(mydf, 'position')   name position firstname secondname 1  hla   1:1-15         1       1-15 2  hla   1:2-16         1       2-16 3  hla   1:3-17         1       3-17

but in output new columns named 'firstname' , 'secondname' , not 'part1' , 'part2'

example data from: https://stats.stackexchange.com/questions/6806/splitting-a-numeric-column-for-a-dataframe

how can correct problem? help.


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