Extensions.Quantities.Subtraction

Classification

Name	Subtraction
Short Description	Subtraction of two numeric variables
Class	Operations
Extension	OTX Quantities extension
Group	Overloading semantics
Exceptions	InvalidConversionException
Checker Rules	-
Standard Compliant	Yes

OTL Syntax

QuantityVariable = QuantityTerm - NumericTerm;
QuantityVariable = NumericTerm - QuantityTerm;

Description

This is a term which as a result of the subtraction of two numeric values ​​(is NumericQuantity) returns with respect to their units.

• When Quantity values are subtracted, the physical dimensions of the display unit of all Quantity operands shall be identical.

• If scalar operands exist, they shall be interpreted as normalized values according to the physical dimension of the Quantity operands. This allows e.g. the addition of 2 km - 1 m - 11 which will result in a Quantity of 1988 m.

• The display unit of the resulting Quantity should be set to the SI base unit corresponding to the Quantity's physical dimension. Furthermore, the display precision of the resulting Quantity shall be the maximum of the display precisions of the operands.

Return Value

The Term returns the value, see table below.

In OTX, Terms are categorized according to its return data type!

Data Type	Description
Quantity	Result of the subtraction of two numeric variables (NumericQuantity)

Properties

Name	Data Type	Class	Default	Cardinality	Description
QuantityTerm1	Quantity	Term	-	[1]	Left operand is of type NumericQuantity
QuantityTerm2	Quantity	Term	-	[1]	Right operand is of type NumericQuantity

OTL Examples

/// Local Declarations

Quantities.Quantity Quantity;

/// Flow

Quantity = (2 [@Unit, "BL_DataLibraMIB.odx", "km"] - 1 [@Unit, "BL_DataLibraMIB.odx", "m"]) - 11;

See also

Addition
Multiplication
Division
Modulo
Absolute Value
Negation