Problem with importing and getting results

[Unknown]

Hi Juan,

Thanks for your great toolbox. I wanted to use your toolbox in my project. I used following codes, but every time I get “nan”as a result. Would you please help me out?

Cheers
Mohammad

FUNCTION_BLOCK Backoff

VAR_INPUT
NBRate: REAL;
Datarate: REAL;
END_VAR

VAR_OUTPUT
BE: REAL;
END_VAR

FUZZIFY NBRate
RANGE := (-0.100 .. 6.000);
TERM low := Triangle -0.100 0.000 0.200;
TERM medium := Triangle 0.000 0.750 1.500;
TERM mediumhigh := Triangle 0.750 1.500 2.750;
TERM high := Triangle 2.000 5.000 6.000;
END_FUZZIFY

FUZZIFY Datarate
RANGE := (0.000 .. 102.000);
TERM low := Triangle 0.000 1.600 3.200;
TERM medium := Triangle 1.600 24.000 50.000;
TERM mediumhigh := Triangle 24.000 50.000 80.000;
TERM high := Triangle 50.00 100.000 102.000;
END_FUZZIFY

DEFUZZIFY BE
RANGE := (1.000 .. 9.000);
TERM d1 := Triangle 1.000 2.010 2.500;
TERM d2 := Triangle 2.000 2.510 3.000;
TERM d3 := Triangle 2.000 3.010 4.000;
TERM d4 := Triangle 3.000 4.010 5.000;
TERM d5 := Triangle 5.000 6.010 7.000;
TERM d6 := Triangle 6.000 7.010 8.000;
TERM d7 := Triangle 7.000 8.010 9.000;
METHOD : COG;
ACCU : MAX;
DEFAULT := nan;
END_DEFUZZIFY

RULEBLOCK
AND : MIN;
OR : MAX;
ACT : MIN;
RULE 1 : is NBRate is low AND Datarate is low then BE is d2;
RULE 2 : if NBRate is low AND Datarate is medium then BE is d2;
RULE 3 : if NBRate is low AND Datarate is mediumhigh then BE is d2;
RULE 4 : if NBRate is low AND Datarate is high then BE is d2;
RULE 5 : if NBRate is medium AND Datarate is low then BE is d3;
RULE 6 : if NBRate is medium AND Datarate is medium then BE is d3;
RULE 7 : if NBRate is medium AND Datarate is mediumhigh then BE is d3;
RULE 8 : if NBRate is medium AND Datarate is high then BE is d4;
RULE 9 : if NBRate is mediumhigh AND Datarate is low then BE is d4;
RULE 10 : if NBRate is mediumhigh AND Datarate is medium then BE is d4;
RULE 11 : if NBRate is mediumhigh AND Datarate is mediumhigh then BE is d4;
RULE 12 : if NBRate is mediumhigh AND Datarate is high then BE is d5;
RULE 13 : if NBRate is high AND Datarate is low then BE is d4;
RULE 14 : if NBRate is high AND Datarate is medium then BE is d5;
RULE 15 : if NBRate is high AND Datarate is mediumhigh then BE is d5;
RULE 16 : if NBRate is high AND Datarate is high then BE is d5;
END_RULEBLOCK

END_FUNCTION_BLOCK

Engine* engine = new Engine;
FclImporter* importer = new FclImporter;
std::string inputFilename = “NBrateDatarate_BEv10.fcl”;
engine = importer->fromFile(inputFilename);
engine->setInputValue(“NBRate”, 5.5);
engine->setInputValue(“Datarate”, 50.0);
engine->process();
cout<<“This is for Back-off: “<< engine->getOutputValue(“BE”) <<endl;

[Juan Rada-Vilela (admin)]

Hi Mohammad,

you should use QtFuzzyLite to help you with such kind of issues.

The problems you have are:
(1) the first rule starts with is instead of if
(2) the fuzzy operators (AND, OR) are case sensitive, and in fuzzylite you utilize “and” and “or” instead of their upper-case operators.

Cheers,

Juan

[Unknown]

Thanks Juan.

Cheers,
Mohammad

[Author]

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