Module # 6 Doing math in R part 2



Issaiah Jennings

Module # 6 Doing math in R part 2

In this code, I performed three matrix operations in R. First, I created two matrices, A and B, and used basic matrix arithmetic to compute their sum and difference. Next, I used the diag() function to generate a 4x4 diagonal matrix with specific values. Finally, I constructed a 5x5 matrix by initializing a diagonal of 3s and modifying the first row and column to match the required structure. This method illustrates simple and effective matrix manipulation techniques in R.


> # 1. Define matrices A and B

> A <- matrix(c(2,0,1,3), ncol=2)

> B <- matrix(c(5,2,4,-1), ncol=2)

>

> # a) Matrix Addition

> A_plus_B <- A + B

>

> # b) Matrix Subtraction

> A_minus_B <- A - B

>

> # 2. Create a diagonal matrix with given values

> diag_matrix <- diag(c(4,1,2,3))

>

> # 3. Generate the specified 5x5 matrix

> m <- diag(3, 5, 5)

> m[1, 2:5] <- 1 # Set first row (except first element) to 1

> m[2:5, 1] <- 2 # Set first column (except first element) to 2

>

> # Print results

> A_plus_B

[,1] [,2]

[1,] 7 5

[2,] 2 2

> A_minus_B

[,1] [,2]

[1,] -3 -3

[2,] -2 4

> diag_matrix

[,1] [,2] [,3] [,4]

[1,] 4 0 0 0

[2,] 0 1 0 0

[3,] 0 0 2 0

[4,] 0 0 0 3

> m

[,1] [,2] [,3] [,4] [,5]

[1,] 3 1 1 1 1

[2,] 2 3 0 0 0

[3,] 2 0 3 0 0

[4,] 2 0 0 3 0

[5,] 2 0 0 0 3

>https://github.com/Ijennin/R-Functions/blob/c1cb5225ef1637a2bb6b755a12c20e830058ec83/Module%20%23%206%20Doing%20math%20in%20R%20part%202

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