Syntax:
ISLOGICAL(Reference)
Description:
Returns TRUE if the specified cell contains a logical value (i.e., TRUE or FALSE).
Example:
If A1 contains TRUE, and C7 contains a text string, then:
ISLOGICAL(A1) returns TRUE
ISLOGICAL(C7) returns FALSE
See also:
ISTEXT, ISNUMBER, ISREF, ISNONTEXT