Work along - Matrices

Load data to your workspace by executing

source("http://www3.nd.edu/~steve/computing_with_data_2014/4_Matrices/work_along_data_S4.R")

Matrix formation and arrangement

• How many rows and columns are in M1?
  
• Rearrange the underlying entries of M1 as a 4 x 3 matrix.

Subsetting and assignment

• Replace the NA values in M2 by 0’s

rbind and cbind

• Form a matrix that binds the columns of M1 and the matrix z. Check that the dimensions match first.
• What happened to the numbers?