Applying a function to two lists?

Question

To find the row-wise correlation of two matrices X and Y, the output should have a correlation value for row 1 of X and row 1 of Y, ..., hence in total ten values (because t

Answer 1

You seem to be looking for mapply. Here's an example:

listA <- list(matrix(rnorm(2000), nrow=10),
              matrix(rnorm(2000), nrow=10))
listB <- list(matrix(rnorm(2000), nrow=10),
              matrix(rnorm(2000), nrow=10))
mapply(function(X,Y) {
  sapply(1:10, function(row) cor(X[row,], Y[row,]))
  }, X=listA, Y=listB)