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Packages
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)