Sub

Arithmetic functions subtract(-)

syntax

• sub(a, b)
• a - b

definition

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.

applies to

Data items with Numeric or Point value type

conditions

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

example

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

A	B		AminB
0	1	-1
1	-1	2
-2	2	-4
3.6	1.44	2.16
999	111	888

ADomain, nr of rows = 5

See also

• Sub (polygon difference)