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Getting a Matrix of number of columns in R Programming – col() Function
  • Last Updated : 03 Jun, 2020
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col() function in R Language is used to get a matrix which contains the number of columns of the matrix passed to it as argument.

Syntax: col(x, as.factor=FALSE)

Parameters:
x: matrix
as.factor: a logical value indicating whether the value should be returned as a factor of column labels (created if necessary) rather than as numbers

Example 1:




# R program to illustrate
# col function
  
# Initializing a matrix with
# 2 rows and 2 columns
x <- matrix(c(1, 2, 3, 4), 2, 2)
  
# Getting the matrix representation
x
  
# Calling the col() function
col(x)

Output:



     [, 1] [, 2]
[1, ]    1    3
[2, ]    2    4
     [, 1] [, 2]
[1, ]    1    2
[2, ]    1    2

Example 2:




# R program to illustrate
# col function
  
# Initializing a matrix with
# 3 rows and 3 columns
x <- matrix(rep(1:9), 3, 3)
  
# Getting the matrix representation
x
  
# Calling the col() function
col(x)

Output:

     [, 1] [, 2] [, 3]
[1, ]    1    4    7
[2, ]    2    5    8
[3, ]    3    6    9

     [, 1] [, 2] [, 3]
[1, ]    1    2    3
[2, ]    1    2    3
[3, ]    1    2    3

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