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Update return of class(mat) according to R 4.0.0

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A matrix is the special case of a two-dimensional ‘array’.  Since R 4.0.0, ‘inherits(m, "array")’ is true for a ‘matrix’ ‘m’, which makes class(mat) return "matrix" "array", not only "matrix" as before.
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Marcel Ribeiro Dantas 2022-04-09 00:14:18 +02:00 committed by GitHub
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@ -405,7 +405,7 @@ mat
# [2,] 2 5 # [2,] 2 5
# [3,] 3 6 # [3,] 3 6
# Unlike a vector, the class of a matrix is "matrix", no matter what's in it # Unlike a vector, the class of a matrix is "matrix", no matter what's in it
class(mat) # => "matrix" class(mat) # => "matrix" "array"
# Ask for the first row # Ask for the first row
mat[1,] # 1 4 mat[1,] # 1 4
# Perform operation on the first column # Perform operation on the first column