> For the complete documentation index, see [llms.txt](https://docs.inforiver.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.inforiver.com/formula-syntax/logical-functions.md). # Logical functions Apply logical functions to test conditions and return TRUE or FALSE results.

NAME	DESCRIPTION	SYNTAX	EXPLANATION	EXAMPLE
AND	Returns TRUE only if all conditions are TRUE.
IN	Returns TRUE if the specified value is one of the values in the list or array.
ISBLANK	Returns TRUE if the specified cell value is blank or empty.	ISBLANK(value)	Returns TRUE if AC is empty	ISBLANK(AC)
ISEMPTY	Returns TRUE if the specified cell value is blank or empty. It works similar to ISBLANK.	ISEMPTY(value)	Returns TRUE if AC has no value	ISEMPTY(AC)
ISNUMBER	Returns TRUE if the cell value is a valid number.	ISNUMBER(value)	Returns AC-PY/PY if the value is a number else returns 0	IF(ISNUMBER((AC-PY)/PY), (AC-PY)/PY , 0)
NOT	Returns the opposite logical value of the argument.	NOT( logical_test )	Will return 50 if the region is not West otherwise returns 25	IF(NOT(Region == "West"), 50, 25)
OR	Returns TRUE if any argument is TRUE; returns FALSE only if all arguments are FALSE.	OR( logical_test1, [logical_test2], ... )	Will return 25 if the region is West or East otherwise returns 30	IF(OR(Region == "West", Region =="East"), 25, 30)
XOR	Returns TRUE if the number of satisfied conditions is odd, and FALSE if it is even.	XOR( logical_test1, [logical_test2], ... )	Will return 25 for all category in the West except for category Urban, and returns 25 for all Urban category under all region except for west, for all other items returns 30	IF(XOR(Region == "West", Category=="Urban"), 25, 30)
ISREFEXIST	Returns TRUE if the specified reference exists in the model.

### Logical Operators

TITLE	OPERATORS	DESCRIPTION
AND	&&	Logical AND
OR	\|\|	Logical OR
XOR	^	Logical Exclusive OR

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