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col2char transform columns type to character.
col2char(x, start, end = ncol(x))
a dataframe
number of start column
number of last column (default=last)
Return a dataframe with transformed columns.
# NOT RUN { v=data.frame(c(3,2,5,6,5,4)) class(v[,1]) #here class is numeric v=col2char(v,1) class(v[,1]) #now class is character # }
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