1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
## Copyright (C) 2011-2025 L. Markowsky <lmarkowsky@gmail.com>
##
## This file is part of the fuzzy-logic-toolkit.
##
## The fuzzy-logic-toolkit is free software; you can redistribute it
## and/or modify it under the terms of the GNU General Public License
## as published by the Free Software Foundation; either version 3 of
## the License, or (at your option) any later version.
##
## The fuzzy-logic-toolkit is distributed in the hope that it will be
## useful, but WITHOUT ANY WARRANTY; without even the implied warranty
## of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with the fuzzy-logic-toolkit; see the file COPYING. If not,
## see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {@var{fis} =} addmf (@var{fis}, @var{in_or_out}, @var{var_index}, @var{mf_name}, @var{mf_type}, @var{mf_params})
##
## Add a membership function to an existing FIS
## structure and return the updated FIS.
##
## The types/values of the arguments are expected to be:
##
## @multitable @columnfractions .35 .65
## @headitem Argument @tab Expected Type or Value
## @item @var{fis}
## @tab an FIS structure
## @item @var{in_or_out}
## @tab 'input' or 'output' (case-insensitive)
## @item @var{var_index}
## @tab valid index of an FIS input/output variable
## @item @var{mf_name}
## @tab a string
## @item @var{mf_type}
## @tab a string
## @item @var{mf_params}
## @tab a vector
## @end multitable
## @sp 1
## If @var{mf_type} is one of the built-in membership functions, then the
## number and values of the parameters must satisfy the membership function
## requirements for the specified @var{mf_type}.
##
## Note that addmf will allow the user to add membership functions or
## membership function names for a given input or output variable that
## duplicate mfs or mf names already entered.
##
## Also, constant and linear membership functions are not restricted to FIS
## structure outputs or to Sugeno-type FIS structures, and the result of using
## them for FIS inputs or Mamdani-type FIS outputs has not yet been tested.
##
## To run the demonstration code, type "@t{demo addmf}" (without the quotation
## marks) at the Octave prompt.
## This demo creates two FIS input variables and associated membership functions
## and then produces two figures showing the term sets for the two FIS inputs.
##
## @seealso{rmmf, setfis}
## @end deftypefn
## Author: L. Markowsky
## Keywords: fuzzy-logic-toolkit fuzzy membership
## Directory: fuzzy-logic-toolkit/inst/
## Filename: addmf.m
## Note: The demo code is based on an assignment written by
## Dr. Bruce Segee (University of Maine Dept. of ECE).
## Last-Modified: 12 Jun 2024
function fis = addmf (fis, in_or_out, var_index, mf_name, mf_type, ...
mf_params)
## If the caller did not supply 6 argument values with the correct
## types, print an error message and halt.
if (nargin != 6)
error ("addmf requires 6 arguments\n");
elseif (!is_fis (fis))
error ("addmf's first argument must be an FIS structure\n");
elseif (!(is_string (in_or_out) && ...
ismember (tolower (in_or_out), {'input', 'output'})))
error ("addmf's second argument must be 'input' or 'output'\n");
elseif (!is_var_index (fis, in_or_out, var_index))
error ("addmf's third argument must be a variable index\n");
elseif (!(is_string (mf_name) && is_string (mf_type)))
error ("addmf's fourth and fifth arguments must be strings\n");
elseif (!are_mf_params (mf_type, mf_params))
error ("addmf's sixth argument must be a vector of parameters\n");
endif
## Create a new membership function struct and update the
## FIS structure.
new_mf = struct ('name', mf_name, 'type', mf_type, 'params', ...
mf_params);
if (strcmp (tolower (in_or_out), 'input'))
if (length (fis.input(var_index).mf) == 0)
fis.input(var_index).mf = new_mf;
else
fis.input(var_index).mf = [fis.input(var_index).mf, new_mf];
endif
else
if (length (fis.output(var_index).mf) == 0)
fis.output(var_index).mf = new_mf;
else
fis.output(var_index).mf = [fis.output(var_index).mf, new_mf];
endif
endif
endfunction
%!demo
%! ## Create new FIS.
%! a = newfis ('Heart-Disease-Risk', 'sugeno', ...
%! 'min', 'max', 'min', 'max', 'wtaver');
%!
%! ## Add two inputs and their membership functions.
%! a = addvar (a, 'input', 'LDL-Level', [0 300]);
%! a = addmf (a, 'input', 1, 'Low', 'trapmf', [-1 0 90 110]);
%! a = addmf (a, 'input', 1, 'Low-Borderline', 'trapmf', ...
%! [90 110 120 140]);
%! a = addmf (a, 'input', 1, 'Borderline', 'trapmf', ...
%! [120 140 150 170]);
%! a = addmf (a, 'input', 1, 'High-Borderline', 'trapmf', ...
%! [150 170 180 200]);
%! a = addmf (a, 'input', 1, 'High', 'trapmf', [180 200 300 301]);
%!
%! a = addvar (a, 'input', 'HDL-Level', [0 100]);
%! a = addmf (a, 'input', 2, 'Low-HDL', 'trapmf', [-1 0 35 45]);
%! a = addmf (a, 'input', 2, 'Moderate-HDL', 'trapmf', [35 45 55 65]);
%! a = addmf (a, 'input', 2, 'High-HDL', 'trapmf', [55 65 100 101]);
%!
%! ## Plot the input membership functions.
%! plotmf (a, 'input', 1);
%! plotmf (a, 'input', 2);
%!shared fis
%! fis = readfis ('mamdani_tip_calculator.fis');
%!test
%! fis = addmf(fis, 'input', 1, 'Excellent', 'trapmf', [5 8 10 11]);
%! assert(fis.input(1).mf(3).name, 'Excellent');
## Test input validation
%!error <addmf requires 6 arguments>
%! addmf()
%!error <addmf requires 6 arguments>
%! addmf(1)
%!error <addmf requires 6 arguments>
%! addmf(1, 2)
%!error <addmf requires 6 arguments>
%! addmf(1, 2, 3)
%!error <addmf requires 6 arguments>
%! addmf(1, 2, 3, 4)
%!error <addmf requires 6 arguments>
%! addmf(1, 2, 3, 4, 5)
%!error <addmf: function called with too many inputs>
%! addmf(1, 2, 3, 4, 5, 6, 7)
%!error <addmf's first argument must be an FIS structure>
%! addmf(1, 2, 3, 4, 5, 6)
%!error <addmf's second argument must be 'input' or 'output'>
%! addmf(fis, 'file', 3, 4, 5, 6)
%!error <addmf's third argument must be a variable index>
%! addmf(fis, 'input', 3, 4, 5, 6)
%!error <addmf's fourth and fifth arguments must be strings>
%! addmf(fis, 'input', 1, 4, 'string', 6)
%!error <addmf's fourth and fifth arguments must be strings>
%! addmf(fis, 'input', 1, 'string', 5, 6)
%!error <addmf's sixth argument must be a vector of parameters>
%! addmf(fis, 'input', 1, 'string', 'trapmf', [])
|
