Check if the Object is a Matrix in R Programming – is.matrix() Function

is.matrix() function in R Language is used to return TRUE if the specified data is in the form of matrix else return FALSE.

Syntax: is.matrix(x)

Parameters:
x: specified matrix

Example 1:

# 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)

Output:

[1] TRUE
[1] TRUE
[1] TRUE

Example 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")

Output:

[1] FALSE
[1] FALSE
[1] FALSE
[1] FALSE