# How to find the number of elements in an array in Matlab and Octave

To find out the number of elements of a vector, use the length(v) function

**length(v)**

The function counts the number of elements in an array.

The number of elements in a vector is also called the size of the vector.

## Examples

**Esempio 1**

Define a column vector

>> w=[1;2;3;4;5]

To know the number of elements of the vector use the **length() ** function

>> length(w)

ans = 5

The vector has 5 elements

**Example 2**

Define a row vector

>> w=[1 2 3 4 5]

To count the number of elements of the vector use the **length() **function

>> length(w)

ans = 5

The vector has 5 elements

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