No, this is not how a function is called in MATLAB. Read here: https://www.mathworks.com/help/matlab/matlab_prog/create-functions-in-files.html. You cannot pass input when declaring the function. Which means that first line should be like this
function [coordinates] = stlread(filename)
..
..
fid = fopen(filename);
end
After declaring the function, you can call it like this
stlread('test.stl')
So your file should be like this
clear; % don't use clear all
clc;
coordinates = stlread('test.stl')
function [coordinates] = stlread(filename)
..
..
fid = fopen(filename);
end
and then run the script.
Note that from R2018b, MATLAB also have its own stlread() function. You can also use that.
