NullMinus()

Returns the difference of the given PetroVisor signals or numbers, even if the minuend or subtrahend is Null. If both, minuend and subtrahend are Null, the result is Null. (!-)

Syntax

expression left !- expression right

NullMinus(expression left, expression right)

• expression left: signal expression or numeric value
• expression right: signal expression or numeric value

Examples

“oil production rate” in “m3/h” !- 5

NullMinus(“oil production rate” in “m3/h”, 5)