Matlab can't recognize my functions

[dmatador]

I am new to Matlab and have been having problems running a program that has functions defined in separate files and calls them. I am putting everything onto my flash drive and setting the directory to that, but it gives me an error saying that the input argument in the first function called is undefined. It worked for my friend who wrote the program but not for me after receiving it via email. Any suggestions?

 

[shoehorn]

Post the relevant code. Without code and error messages, nobody can help you.