The easiest way to delete a function is to set it equal to nil, e.g. myfunc = nil. You should then call the collectgarbage() function to free up the memory. Garbage collection will actually occur automatically, but it can take up to a few seconds to process. You can call the function yourself to avoid unexpected delays caused by the automatic process. It is recommended that you review the information in the 2600B Series Reference Manual about the collectgarbage() function, and Lua memory management.