# R program to illustrate# is.matrix function# Specifying some different types of arrays
A <- matrix(c(1:5))
B <- matrix(c(1:12), nrow =4, byrow =TRUE)
C <- matrix(c(1:12), nrow =4, byrow =FALSE)# Calling is.matrix() function
is.matrix(A)
is.matrix(B)
is.matrix(C)
R
输出
[1]TRUE[1]TRUE[1]TRUE
R
例2 :
# R program to illustrate# is.matrix function# Specifying Biochemical oxygen demand data
x <- BOD
# Calling is.matrix() function
is.matrix(x)# Calling is.matrix() function# over different types of data
is.matrix(4)
is.matrix("2")
is.matrix("a")