Fuzzy Control Language, or FCL, is a language for implementing fuzzy logic, especially fuzzy control. It was standardized by IEC 61131-7. It is a domain-specific programming language: it has no features unrelated to fuzzy logic, so it is impossible to even print "Hello, world!". Therefore, one does not write a program in FCL, but one may write part of it in FCL.
FCL allows the programmer to specify fuzzy sets, which are lists of points on a graph, as well as IF-THEN rules, for example:
RULE 0: IF (Temperature IS Cold) THEN (Output IS High)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:
RULE 0: IF (Temperature IS VERY Cold) THEN (Output IS VERY High)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.
Famous quotes containing the words fuzzy, control and/or language:
“What do you think of us in fuzzy endeavor, you whose directions are sterling, whose lunge is straight?
Can you make a reason, how can you pardon us who memorize the rules and never score?”
—Gwendolyn Brooks (b. 1917)
“Time in the hand is not control of time,
Nor shattered fragments of an instrument
A proof against the wind; the wind will rise,
We can only close the shutters.”
—Adrienne Rich (b. 1929)
“Repeat thy song, till the familiar lines
Are footpaths for the thought of Italy!
Thy flame is blown abroad from all the heights,
Through all the nations, and a sound is heard,
As of a mighty wind, and men devout,
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In their own language hear thy wondrous word,
And many are amazed and many doubt.”
—Henry Wadsworth Longfellow (1809–1882)