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  3. Linear Algebra for Data Science in R

Exercise

Creating Matrices in R

Matrices can be created and analyzed in a few different ways in R.

One way is to create the matrix yourself. There are a few different ways you can do this.

The matrix(a, nrow = b, ncol = c) command in R creates a matrix that repeats the element a in a matrix with b rows and c columns.

A matrix can be manually created by using the c() command as well.

Instructions

100 XP

  • The command matrix(1, nrow = 2, ncol = 3) creates a 2 by 3 matrix of 1's. Create a 3 by 2 matrix of 2's and print the result.

  • The command matrix(c(1, 2, 3, 2), nrow = 2, ncol = 2, byrow = FALSE) creates a 2 by 2 matrix by superimposing the vectors c(1,2) and c(3,2) as columns. Change byrow to equal TRUE and print the result.

  • A 2 by 2 matrix of 1's (called A) is provided for you. Add this matrix to the previous matrix using the + command.