How to normalize a plot ?

Hi, can anybody help me to understand how to normalize a spectrum ? I have a spectra and I want to obtain its area equal to 1. Thanks in advance.

Answer 1

[Jan]

If you want the area to be 1.0, create the sum over the spectrum and divide the values by the result.

spectrum   = rand(1, 100);  % Example data
normalized = spectrum / sum(spectrum);

[Snapshot83]

Thank you for your reply. What does it mean sum ? How I should proceed if I have value in x and y coloumns ?