EXECIN

Executes functions and scripts not in the path.

EXECIN Execute a function or script in different directory.

EXECIN(FUNCNAME) will execute function FUNCNAME, which is a string that includes the full path of the function.

[Y1, Y2, ...] = EXECIN(FUNCNAME, X1, X2, ...) allows input and output arguments that are normally allowed by the function FUNCNAME.

Example:
[s, out] = execin('C:\mywork dir\testfunction.m', x1, x2);

This is quite similar to Brett Shoelson's EXTERNALFCN. I didn't realize it until I made it. But there are some advantages such as ability to call functions without output arguments, and assigning outputs in the caller workspace (not base).