Set class of data frames columns

This function is designed to ease the changes of column's class of a given data frame.

setColClass(x, colid, cls)

Arguments

x	a data frame or an R object to be coerced into a data frame.
colid	the identity of columns for which class are to be changed.
cls	a character vector containing the classes' names to be used in the same order as colid. By default, cls is repeated until its size equals colid's size.

Value

A data frame whose columns have the desired classes.

Examples

df1 <- matrix(signif(runif(20),4), ncol=2)
df2 <- setColClass(df1, 2, 'character')
str(df1)
#>  num [1:10, 1:2] 0.6433 0.3144 0.2275 0.0635 0.0785 ...
str(df2)
#> 'data.frame':	10 obs. of  2 variables:
#>  $ V1: num  0.6433 0.3144 0.2275 0.0635 0.0785 ...
#>  $ V2: chr  "0.9258" "0.9202" "0.152" "0.6542" ...