Question

How to create matrix from a vector in R

Answer 1

vec <- c(5, 9, 0, 1, 8, 4)

m <- matrix(vec, ncol = 3)

print(m)
 
 
 
 
 
# run:
#
#      [,1] [,2] [,3]
# [1,]    5    0    8
# [2,]    9    1    4
# 

 

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Answer 2

vec <- c(5, 9, 0, 1, 8, 4)

m <- matrix(vec, nrow = 3)

print(m)
 
 
 
 
 
# run:
#
#      [,1] [,2]
# [1,]    5    1
# [2,]    9    8
# [3,]    0    4
# 

 

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Answer 3

vec <- c(5, 9, 0, 1, 8, 4)

m <- matrix(vec, nrow = 3, byrow = TRUE) # TRUE = matrix is filled by rows

print(m)
 

 
 
# run:
#
#      [,1] [,2]
# [1,]    5    9
# [2,]    0    1
# [3,]    8    4
# 

 

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