I hope this will help.
### Find rows with minimum value from every 5 rows
## Create the data
mlb <- data.frame(mass_position=c(1,2,3,4,5,6,7,8,9,10,
11,12,13,14,15,16,17,18,19,20),
mass_value=c(9,2,3,2,5,6,7,8,9,10,2.1,12, 1,14,15,16,17,18,19,20),
mass_label=c("lab1","lab2","lab3","lab4","lab5","lab6","lab7","lab8","lab9","lab10",
"lab11","lab12","lab13","lab14","lab15","lab16","lab17","lab18","lab19","lab20")
)
## Sort the data three times
## Create result by selecting first rows of every 5 rows
mlb2 <- mlb[order(mlb[,1] %/% 5.1, mlb[,2], mlb[,1]),][mlb[,1] %% 5 == 1,]
## Exclude rows which mass_value > 2
(mlb3 <- mlb2[mlb2[,2] <= 2,])
-----
A R learner.
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