Function File: fis = rmmf (fis, in_or_out, var_index, mf, mf_index)
Remove a membership function from an existing FIS structure and return the updated FIS.
The types of the arguments are expected to be:
- fis - an FIS structure
- in_or_out - either 'input' or 'output' (case-insensitive)
- var_index - an FIS input or output variable index
- mf - the string 'mf'
- mf_index - a string
Note that rmmf will allow the user to delete membership functions that are currently in use by rules in the FIS.