Getting a Matrix of number of rows in R Programming - row() Function

In this article, we will discuss how to find the number of rows and columns in a matrix in R Programming Language.

nrow() Function in R

nrow() function in R Language is used to get the row number of a matrix.

Syntax: 

row(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

ncol() Function in R

The ncol() function in R is used to get the number of columns in a matrix.

Find number of rows and columns in a Basic Matrix

# Create an irregular matrix
irregular_mat <- matrix(1:9,3,3)

# Find the number of rows and columns
num_rows_irregular <- nrow(irregular_mat)
num_cols_irregular <- ncol(irregular_mat)

# Print the results
print(paste("Number of rows in irregular matrix:", num_rows_irregular))
print(paste("Number of columns in irregular matrix:", num_cols_irregular))

Output:

[1] "Number of rows in irregular matrix: 3"
[1] "Number of columns in irregular matrix: 3"

Find number of rows and columns in a Irregular Matrix in R

# Create a 3x4 matrix
mat <- matrix(1:24,6,4)
mat

# Find the number of rows and columns
num_rows <- nrow(mat)
num_cols <- ncol(mat)

# Print the results
print(paste("Number of rows:", num_rows))
print(paste("Number of columns:", num_cols))

Output:

     [,1] [,2] [,3] [,4]
[1,]    1    7   13   19
[2,]    2    8   14   20
[3,]    3    9   15   21
[4,]    4   10   16   22
[5,]    5   11   17   23
[6,]    6   12   18   24
[1] "Number of rows: 6"
[1] "Number of columns: 4"