I have a data frame each with 10 variables of integer data for various
attributes about each row of data, and I need to know the highest 5
variables related to each of
row in this data frame and output that to a new data frame. In addition to
the 5 highest variable names, I also need to know the corresponding 5
highest variable values for each row.
A simple code example to generate a sample data frame for this is:
set.seed(1)
DF <- matrix(sample(1:9,9),ncol=10,nrow=9)
DF <- as.data.frame.matrix(DF)
This would result in an example data frame like this:
# V1 V2 V3 V4 V5 V6 V7 V8 V9 V10
# 1 3 2 5 6 5 2 6 8 1 3
# 2 1 4 7 8 7 7 3 4 2 9
# 3 2 3 4 7 5 8 9 1 3 5
# 4 3 8 3 4 5 6 7 4 6 5
# 5 6 2 3 7 2 1 8 3 2 4
# 6 8 2 4 8 3 2 9 7 6 5
# 7 1 5 3 6 8 3 8 9 1 3
# 8 9 3 5 8 4 9 7 8 1 2
# 9 1 2 4 8 3 2 1 2 5 6
My ideal output would be something like this:
# V1 V2 V3 V4 V5
# 1 V2:9 V7:8 V8:7 V4:6 V3:5
# 2 V9:9 V3:8 V5:7 V7:6 V4:5
# 3 V5:9 V3:8 V2:7 V9:6 V7:5
# 4 V8:9 V4:8 V2:7 V5:6 V9:5
# 5 V9:9 V1:8 V6:7 V3:6 V5:5
# 6 V8:9 V1:8 V5:7 V9:6 V4:5
# 7 V2:9 V8:8 V7:7 V5:6 V9:5
# 8 V4:9 V7:8 V9:7 V2:6 V8:5
# 9 V3:9 V7:8 V8:7 V4:6 V5:5
# 10 V6:9 V8:8 V1:7 V9:6 V4:5
I was trying to use code, but this doesn't seem to work:
out <- t(apply(DF, 1, function(x){
o <- head(order(-x), 5)
paste0(names(x[o]), ':', x[o])
}))
as.data.frame(out)
Thanks everyone!
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