R - Matrix Addition/Subtraction

Example Matrix 1

  • Example vector
  • Convert vector into matrix with 4*4
vector1 <- seq(1, 16, by=1)

matrix1 <- matrix(vector1, nrow=4, ncol=4) 

matrix1

##      [,1] [,2] [,3] [,4]
## [1,]    1    5    9   13
## [2,]    2    6   10   14
## [3,]    3    7   11   15
## [4,]    4    8   12   16

Example Matrix 2

  • Produce 4*4 matrix
matrix2 <- matrix(16:1, nrow=4, ncol=4) 
 
matrix2

##      [,1] [,2] [,3] [,4]
## [1,]   16   12    8    4
## [2,]   15   11    7    3
## [3,]   14   10    6    2
## [4,]   13    9    5    1

Matrix Add/Subtraction

print(matrix1 - matrix2)

##      [,1] [,2] [,3] [,4]
## [1,]  -15   -7    1    9
## [2,]  -13   -5    3   11
## [3,]  -11   -3    5   13
## [4,]   -9   -1    7   15