Get maximum value from all matrices in a list

Question

I\'ve created a List of matrices, and now I want to get the maximum values of row in all matrices, how do I get them?

Here is the code for the list:

Answer 1

Your question is a bit unclear, anyway here's something useful:

m1 <- cbind(c(1,2,3),c(7,2,4))
m2 <- cbind(c(-1,19,13),c(21,3,5),c(3,3,0),c(4,5,6))
m3 <- cbind(c(1,2,3,4,5),c(8,18,4,6,7))

mylist <- list(M1=m1,M2=m2,M3=m3)

# get the maximum value for each matrix
lapply(mylist,FUN=max)

# get the global maximum
max(unlist(lapply(mylist,FUN=max)))

# get the maximum value for each row of each matrix
lapply(mylist,FUN=function(x)apply(x,MARGIN=1,FUN=max))


##### OUTPUT #####
> lapply(mylist,FUN=max)
$M1
[1] 7
$M2
[1] 21
$M3
[1] 18

> max(unlist(lapply(mylist,FUN=max)))
[1] 21

> lapply(mylist,FUN=function(x)apply(x,MARGIN=1,FUN=max))
$M1
[1] 7 2 4
$M2
[1] 21 19 13
$M3
[1]  8 18  4  6  7