#### IfcDeriveDimensionalExponents

##### Semantic definitions at the function

Function Definition

Definition from ISO/CD 10303-41:1992: The function determines the dimensional exponents of a unit. For named units the dimensions attribute is returned and for derived units the dimensional exponents are calculated from its elements.

Argument definitions:
X: (input) the unit that the dimensional exponents are being derived from.

##### Formal representations

EXPRESS Specification

FUNCTION IfcDeriveDimensionalExponents
(UnitElements : SET [1:?] Of IfcDerivedUnitElement)
: IfcDimensionalExponents;
LOCAL
Result : IfcDimensionalExponents :=
IfcDimensionalExponents(0, 0, 0, 0, 0, 0, 0);
END_LOCAL;
REPEAT i := LOINDEX(UnitElements) TO HIINDEX(UnitElements);
Result.LengthExponent := Result.LengthExponent +
(UnitElements[i].Exponent *
UnitElements[i].Unit.Dimensions.LengthExponent);
Result.MassExponent := Result.MassExponent +
(UnitElements[i].Exponent *
UnitElements[i].Unit.Dimensions.MassExponent);
Result.TimeExponent := Result.TimeExponent +
(UnitElements[i].Exponent *
UnitElements[i].Unit.Dimensions.TimeExponent);
Result.ElectricCurrentExponent := Result.ElectricCurrentExponent +
(UnitElements[i].Exponent *
UnitElements[i].Unit.Dimensions.ElectricCurrentExponent);
Result.ThermodynamicTemperatureExponent := Result.ThermodynamicTemperatureExponent +
(UnitElements[i].Exponent *
UnitElements[i].Unit.Dimensions.ThermodynamicTemperatureExponent);
Result.AmountOfSubstanceExponent := Result.AmountOfSubstanceExponent +
(UnitElements[i].Exponent *
UnitElements[i].Unit.Dimensions.AmountOfSubstanceExponent);
Result.LuminousIntensityExponent := Result.LuminousIntensityExponent +
(UnitElements[i].Exponent *
UnitElements[i].Unit.Dimensions.LuminousIntensityExponent);
END_REPEAT;
RETURN (Result);
END_FUNCTION;

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