Generate Matrix with i.i.d. Normal Random Variables in R (2 Examples) | matrix() & rnorm() Functions

R code of this video:

N_row ＜- 10 # Define number of rows & columns
N_col ＜- 3

my_mat ＜- matrix(rnorm(N_row * N_col), # Create random matrix
ncol = N_col)
my_mat # Print random matrix

my_df # Print random data frame

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[cherylsusanv]

hello! I have a similiar matrix and i want to find the mean(row)/var(row) for each row of my matrix. how do I do this? or should I set a different type of matrix to start with?

[Skywalker-vckc]

i would like to use a random matrix and the solution of it but only the general code using rnorm or runif

[Skywalker-vckc]

hello
i try to run the code but there is error