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Fuzzy Control Language
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<h2 id="example">Example</h2> RULE 0: IF (temperature IS cold) THEN (output IS low) RULE 1: IF (temperature IS very cold) THEN (output IS high) <h2 id="limitations">Limitations</h2> <p>FCL is not an entirely complete fuzzy language, for instance, it does not support "hedges", which are adverbs that modify the set. For instance, the programmer cannot write: </p><p>RULE 0: If (Temperature is VERY COLD) then (Output is VERY HIGH) </p><p>However, the programmer can simply define new sets for "very cold" and "very high". FCL also lacks support for higher-order fuzzy sets, subsets, and so on. None of these features are essential to fuzzy control, although they may be nice to have. </p> <h2 id="external-links">External links</h2> <ul><li><a href="http://www.fuzzytech.com">fuzzyTECH</a>, a commercial fuzzy logic development system containing the specification document for IEC1131-7 (select Fuzzy Application Library)</li> <li><a href="http://www.fuzzytech.com/binaries/ieccd1.pdf">IEC 1131-7 CD1</a> <a href="https://web.archive.org/web/20210304150537/https://www.fuzzytech.com/binaries/ieccd1.pdf">Archived</a> 2021-03-04 at the <a href="/facts/Wayback_Machine/nmQ3a6JC">Wayback Machine</a> IEC 1131-7 CD1 PDF</li> <li><a href="https://code.google.com/p/fuzzylite">fuzzylite</a>, A fuzzy logic controller library written in C++.</li> <li><a href="http://ffll.sourceforge.net">Free Fuzzy Logic Library (FFLL)</a>, an implementation library written in C++.</li> <li><a href="http://jfuzzylogic.sourceforge.net">JFuzzyLogic</a>, open source FCL + Fuzzy Logic Package (sourceforge, java)</li> <li><a href="http://sourceforge.net/projects/awifuzz">AwiFuzz</a>, open source implementation written in C++ covering all three levels of IEC 61131-7 Fuzzy Controller Language</li> <li><a href="http://pyfuzzy.sourceforge.net/">pyfuzzy</a>, open source implementation written in python.</li></ul>