R Programming; Calculate median of row using FOR loop

问题

How would I calculate the median (use the median function) of each row by using the FOR loop.

Using a matrix; mat = matrix(rnorm(100), 5)

Thank you in advance.

-Bill

回答1:

Here is one possible solution:

mat = matrix(rnorm(100), 5)

medians_of_mat <- numeric()
for(i in 1:nrow(mat)) {
  medians_of_mat[i] <- median(mat[i, ])
}

An easier way would be to use apply:

apply(mat, 1, median)

回答2:

We could use rowMedians from library(matrixStats)

library(matrixStats)
rowMedians(mat)

来源：https://stackoverflow.com/questions/35955409/r-programming-calculate-median-of-row-using-for-loop