[R] Selecting elements

[Jeff Newmiller]

Agreed. Need the rest of a complete example.

On August 19, 2021 11:27:59 PM PDT, PIKAL Petr <petr.pikal using precheza.cz> wrote:
>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
>
>$D
> [1] 37 34 33 27 24 20 17 13 12  3
>
>T inspect highest values. But here I am lost. As C is first and fourth biggest value, you follow third option and select 3 highest A, 3B 2C and 2D?
>
>Or I do not understand at all what you really want to achieve.
>
>Cheers
>Petr
>
>> -----Original Message-----
>> From: R-help <r-help-bounces using r-project.org> On Behalf Of Silvano Cesar da
>> Costa
>> Sent: Thursday, August 19, 2021 10:40 PM
>> To: r-help using r-project.org
>> Subject: [R] Selecting elements
>> 
>> Hi,
>> 
>> I need to select 15 elements, always considering the highest values
>> (descending order) but obeying the following configuration:
>> 
>> 3A - 4B - 0C - 3D or
>> 2A - 5B - 0C - 3D or
>> 3A - 3B - 2C - 2D
>> 
>> If I have, for example, 5 A elements as the highest values, I can only choose
>> (first and third choice) or 2 (second choice) elements.
>> 
>> how to make this selection?
>> 
>> 
>> library(dplyr)
>> 
>> Var.1 = rep(LETTERS[1:4], 10)
>> Var.2 = sample(1:40, replace=FALSE)
>> 
>> data = data.frame(Var.1, Var.2)
>> (data = data[order(data$Var.2, decreasing=TRUE), ])
>> 
>> Elements = data %>%
>>   arrange(desc(Var.2))
>> 
>> Thanks,
>> 
>> Prof. Dr. Silvano Cesar da Costa
>> Universidade Estadual de Londrina
>> Centro de Ciências Exatas
>> Departamento de Estatística
>> 
>> Fone: (43) 3371-4346
>> 
>> 	[[alternative HTML version deleted]]
>> 
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-- 
Sent from my phone. Please excuse my brevity.