r - Changing df and col in a Function -


i having trouble creating function allow me to, on fly, change data frame (df) , column (col). each column has 2 possible entries, e.g., left or right.

conceptually @ least, i'm trying do:

 myfun = function(df, col){  mean( df$rt[ df$col == levels(df$col)[1] ] ) - mean( df$rt[ df$col == levels(df$col)[2] ] )

so enter like:

myfun( df = m, col = turn_direction )

any appreciated.


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