How to find top N meanings in data frame

Question

everyone
I have a data frame like this:\

mz	var1	var2
1	56	47
34	35	56
67	23	98
23	25	56
67	78	65
12	56	77
77	2	100

I want to find top 4 numbers from column "var1", and extract column "mz" meanings. Result that I expect is following:

1, 34, 67, 12 or (even better)

mz	var1
1	56
34	35
67	78
12	56

I will be glad for any help

Answer 1

You can use order:

result <- df[order(-df$var1),][1:4,-3]
result[order(rownames(result)),]
#>   mz var1
#> 1  1   56
#> 2 34   35
#> 5 67   78
#> 6 12   56