## R – Get Multiple Rows of Matrix

To get multiple rows of matrix, specify the row numbers as a vector followed by a comma, in square brackets, after the matrix variable name. This expression returns the required rows as a matrix.

In this tutorial, we will learn how to get a multiple rows from a Matrix, with examples.

### Syntax

The syntax of the expression to get multiple rows at given vector of positions/indices in a matrix is

`X[rows, ]`

where

Return Value

The expression returns the selected rows as a matrix from matrix `X` at given `rows` numbers.

### Examples

In the following program, we create a matrix and get the rows at position `1` and `3`. We pass the vector `c(1, 3)` for the `rows` in the expression `X[rows, ]`.

example.R

```data <- c(2, 4, 7, 5, 10, 8, 1, 3, 5)
A <- matrix(data, nrow = 3)
rows <- A[c(1,3), ]

print("Matrix A")
print(A)
print("Selected Rows")
print(rows)```

Output

``` "Matrix A"
[,1] [,2] [,3]
[1,]    2    5    1
[2,]    4   10    3
[3,]    7    8    5
 "Selected Rows"
[,1] [,2] [,3]
[1,]    2    5    1
[2,]    7    8    5```

If any of the row numbers is out of bounds for given matrix, then R throws Error “subscript out of bounds”.

Let us try to get a rows at `rows = c(1, 2, 5)`, where the matrix has only `3` rows. Since row number `5` is out of bounds for the given matrix, R must throw the error.

example.R

```data <- c(2, 4, 7, 5, 10, 8, 1, 3, 5)
A <- matrix(data, nrow = 3)
rows <- A[c(1, 2, 5), ]```

Output

`Error in A[c(1, 2, 5), ] : subscript out of bounds`

### Conclusion

In this R Tutorial, we learned how to get multiple rows of a Matrix at given row positions in R, with the help of examples.