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