Getting a Matrix of number of columns in R Programming – col() Function
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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