Keep rows order in data.frame when a function is applied to it.

Keep rows order in data.frame when a function is applied to it.

keep.df.order(df, fun, ...)

Arguments

df

the data.frame that will be changed by the function fun

fun

the function that wille be applied

...

tothet parameters to fun

Source of inspiration

A comment from landroni (2017-09-23 at 15:59) on http://stackoverflow.com

Examples

if (FALSE) {
df.1 = data.frame(object = c('A', 'B', 'D', 'F', 'C'), class = c(2, 1, 2, 3, 1))
df.2 = data.frame(class = c(1, 2, 3), prob = c(0.5, 0.7, 0.3))
merge(df.1, df.2)
keep.df.order(df.1, merge, df.2)
}