Selecting elements
Hallo I am confused, maybe others know what do you want but could you be more specific? Let say you have such data set.seed(123) Var.1 = rep(LETTERS[1:4], 10) Var.2 = sample(1:40, replace=FALSE) data = data.frame(Var.1, Var.2) What should be the desired outcome? You can sort data <- data[order(data$Var.2, decreasing=TRUE), ] and split the data
split(data$Var.2, data$Var.1)
$A [1] 38 35 32 31 30 22 11 8 2 1 $B [1] 39 28 25 23 16 15 7 6 5 4 $C [1] 40 36 29 26 21 19 18 14 10 9 $D [1] 37 34 33 27 24 20 17 13 12 3 T inspect highest values. But here I am lost. As C is first and fourth biggest value, you follow third option and select 3 highest A, 3B 2C and 2D? Or I do not understand at all what you really want to achieve. Cheers Petr
-----Original Message----- From: R-help <r-help-bounces at r-project.org> On Behalf Of Silvano Cesar da Costa Sent: Thursday, August 19, 2021 10:40 PM To: r-help at r-project.org Subject: [R] Selecting elements Hi, I need to select 15 elements, always considering the highest values (descending order) but obeying the following configuration: 3A - 4B - 0C - 3D or 2A - 5B - 0C - 3D or 3A - 3B - 2C - 2D If I have, for example, 5 A elements as the highest values, I can only choose (first and third choice) or 2 (second choice) elements. how to make this selection? library(dplyr) Var.1 = rep(LETTERS[1:4], 10) Var.2 = sample(1:40, replace=FALSE) data = data.frame(Var.1, Var.2) (data = data[order(data$Var.2, decreasing=TRUE), ]) Elements = data %>% arrange(desc(Var.2)) Thanks, Prof. Dr. Silvano Cesar da Costa Universidade Estadual de Londrina Centro de Ci?ncias Exatas Departamento de Estat?stica Fone: (43) 3371-4346 [[alternative HTML version deleted]]
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