Question

How to create matrix and fill the diagonal by array of numbers in R

Answer 1

m = diag(c(7, 9, 2), 3, 3)

print(m)
 

 
       
       
# run:
#
#      [,1] [,2] [,3]
# [1,]    7    0    0
# [2,]    0    9    0
# [3,]    0    0    2
#

 

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Answer 2

m = diag(c(7, 9, 2, 5))

print(m)
 

 
       
       
# run:
#
#      [,1] [,2] [,3] [,4]
# [1,]    7    0    0    0
# [2,]    0    9    0    0
# [3,]    0    0    2    0
# [4,]    0    0    0    5
#

 

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