sub - ObjectVision/GeoDMS GitHub Wiki

Arithmetic functions subtract(-)

• sub(a, b)
• a - b

sub(a, b) or a - b results in the element-by-element subtraction of the values of data item b from the corresponding values of data item a.

If the result of the subtraction exceeds the MinValue or MaxValue of the value type, an error is generated. Use the sub_or_null function if a null value is requested in these cases.

Data items with Numeric or Point Value Type

1. Domain units of the arguments must match or be void (literals or parameters can be subtracted from data items of any domain).
2. Arguments must have matching:
   • value type
   • metric

1. attribute<float32> AminB (ADomain) := sub(A, B);
2. attribute<float32> AminB (ADomain) := A - B;

ADomain, nr of rows = 5

• sub_or_null
• Sub (polygon difference)