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- The logical functions use 0 to indicate a FALSE condition,
- while non-zero values indicate TRUE. Functions return 1 to
- indicate TRUE and 0 for FALSE.
-
- OPERATORS: =, <>, <, >, <=, >=
-
- IF(expr1,expr2,expr3): These expressions may be anything,
- including nested IFs. If expr1 evaluates to non-zero,
- then IF returns the result of expr2, but if expr1
- generates 0, IF returns the result of expr3.
-
- AND(expr list): Returns TRUE if all expressions evaluate
- to non-zero, and FALSE if any evaluate to 0.
-
-
- OR(expr list): Returns TRUE if any of the expressions
- evaluate to non-zero, and FALSE only if all evaluate to
- zero.
-
- AND and OR require at least two arguments, and the upper
- limit is 20.
-
- NOT(expr): Returns TRUE if expr evaluates to zero, and FALSE
- only if expr generates a non-zero value.
-
- ISEMPTY(cell/range list): Returns TRUE if any cells con-
- tained within the list are empty, and FALSE only if all
- possess a value.
-
-
- ISERR(expr/range list): Returns TRUE if any expressions or
- cells within ranges evaluate to an error condition,
- excluding the NA error status.
-
- ISNA(expr/range list): Similar to ISERR, but this function
- checks specifically for the NA error status.
-
- TRUE(): Returns 1.
-
- FALSE(): Returns 0.
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