# How to extract two or more rows from a matrix in Matlab and Octave

To extract two or more rows of a matrix on Matlab and Octave

**M(a:b,:)**

In the first parameter indicate the interval **a:b** between the rows

**term a**is the number of the first row to be extracted**term b**is the number of the last row to be extracted

In the second parameter after the comma indicate the symbol **:** to take all the columns of the matrix

**Alternative method**

Indicate the list of rows to be extracted in square brackets at the first parameter.

Separate the lines from each other by a space or a comma.

**M([a b],:)**

This method allows you to extract even the rows of the matrix that are not close to each other.

## Example

**Example 1**

Define a 3x2 matrix with three rows and two columns

>> M=[1 2; 3 4 ; 5 6]

M =

1 2

3 4

5 6

Extract the first two rows of matrix M

>> M(1:2,:)

ans =

1 2

3 4

The command extracts the first and second rows.

**Example 2**

Extract the first and third rows of the matrix.

>> M([1 3],:)

ans =

1 2

5 6

The command extracts the first and third rows of the M matrix.

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