Retrieving all the comments, the std.m function is actually extremely simple:
function y = std(varargin) y = sqrt(var(varargin{:}));
This is the definition of standard deviation : the square root of Variance .
- Set inline functions Read only
Now don’t break the var.m file because it is more complex and I wonder if the copyright issue will be displayed here.
To avoid the problem of splitting embedded files, it is recommended that you install all Matlab tool files as Read-Only . I remember the old Matlab installer, which makes it possible to do this during installation. I don’t know if the installer offers an option, but if it’s not so easy to do it manually (on Windows just select your folders, right-click Properties , select only read and accept to distribute the properties to all subfolders and files).
Once this is done, your embedded files will be safe. You can change the default behavior of an inline function by overloading it. This consists of writing a function with the same name and organizing its call to the default function (your overload function becomes standard).
This article explains how to overload user-defined functions.
Matlab does not recommend directly overloading built-in functions (instead, for example, calling it a different name, for example mySTD.m ), but if you insist that it is feasible and is still much better than changing the built-in function ... at least , the original function is still not installed.