How to get a value from an array in Matlab and Octave
To read the value of an element from a vector v in Matlab and Octave, type the name of the array and the index position of the element in round brackets.
The term n is an integer indicating the position of the element in the vector index.
If n = "end" Matlab reads the last index position of the vector (last element).
Note. Unlike many programming languages, vector indexing starts from 1 (not 0) in Matlab and Octave. Thus, the first element of the vector is v (1). The second element of the vector is v (2). Typing v (0) causes an error in Matlab and Octave.
Define a vector with 5 elements
To get the first element of the vector, type v(1)
ans = a
To get the second element, type v(2)
ans = b
To get the third element, type v(3)
ans = c
To get the last element, type v(5)
ans = e
Alternatively, to access the last element without specifying the position, use the word "end" and type v(end)
ans = e
In this case the software automatically finds the last position in the index of the vector, before reading and returning the value of the element.