How to run a function in .m octave ?

I am beginner in octave and trying things out.
I wrote the following and saved it as Ftest.m

Code:

pkg load statistics
function [result, F, leftcutoff, rightcutoff] = Ftest(data, type1error)
  sigma = nanvar(data);
  sigma1 = sigma(1,1);
  sigma2 = sigma(1,2);
  df1 = rows(data(:,1)) - sum(isnan(data(:,1)));
  df2 = rows(data(:,2)) - sum(isnan(data(:,2)));
  if (sigma1 > sigma2)
    F = sigma1/sigma2;
    leftcutoff = finv(type1error/2, df1-1, df2-1);
    rightcutoff = finv(1-type1error/2, df1-1, df2-1);
  else
    F = sigma2/sigma1;
    leftcutoff = finv(type1error/2, df2-1, df1-1);
    rightcutoff = finv(1-type1error/2, df2-1,df1-1);
  endif
  if (F>leftcutoff && F<rightcutoff)
    result = "do not reject";
  else
    result = "reject";
  endif
endfunction

I then use addpath('C:\Users\Hello\Dropbox\Octave\') so Octave can find the file.
I then try calling it by Ftest(sampleData, 0.05), but getting the following msg:
warning: function 'Ftest' defined within script file 'C:\Users\Hello\Dropbox\Octave\Ftest.m'
error: invalid call to script C:\Users\Hello\Dropbox\Octave\Ftest.m

 

It is working after I clicked 'run' which I guess compiles the .m file. I didn't realise that

 

Actually, I realised that I couldn't call the function (Ftest(args)) because of the file being a script file instead of a function file. Function file can only contain a single-function definition, and that pkg load statistics at the beginning made it not one.

If a function file should only contain one single function def with file name = function name, is it not possible to define multiple functions inside one file similar to defining many static methods in a utility class in java? I wanna have a file for say 1-sample data, 2-sample data, k-sample data, etc and define multiple functions for each data type, how can that be done?