Documentation/How Tos/Calc: ISNA function

ISNA

Tests for the #N/A (Not Available) error value.

Syntax:

ISNA(value)

Returns TRUE if value is or refers to the #N/A (Not Available) error and FALSE otherwise.

Example:

ISNA(NA())

returns TRUE, because NA() returns the #N/A error.

ISNA(1/0)

returns FALSE, because 1/0 is a #DIV/0! error, not a #N/A error.

ISNA(A1)

where A1 contains "dog", returns FALSE, because "dog" is text, not an error.