Hello. Please forgive me if this problem has already been posted (and solved)
by someone else ... I can't find it anywhere though it seems so very basic.
Here it is:
I have a list comprised of several matrices, each of which has two columns.
> list
[[1]]
[,1] [,2]
[1,] 1 3
[2,] 2 4
[[2]]
[,1] [,2]
[1,] 5 7
[2,] 6 8
[[3]]
[,1] [,2]
[1,] 9 11
[2,] 10 12
I would like R to give me the highest value (max) of each matrice's 2nd
column, and also the max of all those individual highest values. I have
tried
matrix.max <- for (i in 1:3) {
mapply ( max, list [[i]] [2] )
}
for each column's max and
total.max <- for (i in 1:3) {
max(mapply ( max, list [[i]] [2] ))
}
for the total max, but neither works (result: NULL). What am I doing wrong?
Thanks a lot,
Gail
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