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Check if the Object is a Matrix in R Programming – is.matrix() Function
  • Last Updated : 12 Jun, 2020

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:

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# 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)

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Output:

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

Example 2:

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# 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")

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Output:

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