I would like to know how I can calculate the majority vote step by step, for example, comparing column 1 with 2, per line , then 1,2 and 3, per line , then 1, 2, 3 and 4, per line , and so on.
set.seed(1)
a = matrix(sample(1:6, 30, replace = T), ncol = 5)
That is, I get the line i I compare all the elements, I calculate the element that appears the most times and return the same, being output as an array with i rows and j-1 columns.
One way:
sapply(2:ncol(a), function(x) apply(a, 1, function(y) names(which.max(table(y[1:x])))))
[,1] [,2] [,3] [,4]
[1,] "2" "2" "2" "2"
[2,] "3" "3" "3" "3"
[3,] "4" "4" "4" "4"
[4,] "1" "1" "1" "3"
[5,] "2" "2" "2" "2"
[6,] "2" "6" "6" "6"
The first column of the result compares only columns 1 and 2 of the a array to each of the 5 rows. The second column of the result compares columns 1, 2, and 3 of the a array to each of the 5 rows and so on.