smooth function from GUI

A Pushbutton starts a function I have written. That function calls the Matlab function smooth. I get an error that says smooth not recognized.

If I run my function as an m file, the smooth function is found and exceution is normal.

Suggestions?

[Walter Roberson]

Please show the exact error message and line of code.

Please show the code for the pushbutton.

Also, please show

which -all smooth

from the command prompt; then use the debugger and put a breakpoint in at the place that smooth is called, and "which -all smooth" there as well.