r - Dplyr, filter and SE -

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i have data frame 3 columns a, b, c , i'd build function keep rows column lower column (could column b or c)

i know need use filter_ , se make possible dplyr , had @ vignette don't understand how works.'

how transform function se function?

df = data.frame(columna = 1:100,                 columnb = rnorm(100, 50, 10),                 columnc = rnorm(100, 50, 10))  fct = function(df,column_name){   df2 = df %>% filter(columna < column) return(df2) }

transforming expression inside filter_ string 1 way it:

fct = function(df, column_name){   df2 = df %>% filter_(paste("columna <", column_name))   return(df2) } nrow(fct(df, "columnb")) ## [1] 50

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