Difference between revisions of "Documentation/How Tos/Calc: ISERROR function"
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<tt>'''ISERROR(NA())'''</tt> | <tt>'''ISERROR(NA())'''</tt> | ||
: returns <tt>'''TRUE'''</tt>, because <tt>'''NA()'''</tt> returns the <tt>'''#N/A'''</tt> error. | : returns <tt>'''TRUE'''</tt>, because <tt>'''NA()'''</tt> returns the <tt>'''#N/A'''</tt> error. | ||
| + | |||
| + | === Issues: === | ||
| + | * <tt>'''CHOOSE(0;"A";"B";"C";"D")'''</tt> returns <tt>'''Err:502'''</tt> (correctly - the index is out of range) but <tt>'''ISERROR(CHOOSE(0;"A";"B";"C";"D"))'''</tt> also returns <tt>'''Err:502'''</tt>, rather than <tt>'''TRUE'''</tt>. The error is propagated rather than evaluated. | ||
{{Documentation/SeeAlso| | {{Documentation/SeeAlso| | ||
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* [[Documentation/How_Tos/Calc: Functions listed alphabetically|Functions listed alphabetically]] | * [[Documentation/How_Tos/Calc: Functions listed alphabetically|Functions listed alphabetically]] | ||
* [[Documentation/How_Tos/Calc: Functions listed by category|Functions listed by category]]}} | * [[Documentation/How_Tos/Calc: Functions listed by category|Functions listed by category]]}} | ||
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Revision as of 10:52, 2 March 2009
ISERROR
Tests for any error value.
Syntax:
ISERROR(value)
- Returns TRUE if value refers to or evaluates to any error value, including #N/A, and FALSE otherwise.
- Use the ISERR function to test for any errors except #N/A.
Example:
ISERROR(SQRT(-1))
- returns TRUE, because taking the squareroot of -1 is an error.
ISERROR(C5)
- where C5 contains 123, returns FALSE, because 123 is not an error.
ISERROR(NA())
- returns TRUE, because NA() returns the #N/A error.
Issues:
- CHOOSE(0;"A";"B";"C";"D") returns Err:502 (correctly - the index is out of range) but ISERROR(CHOOSE(0;"A";"B";"C";"D")) also returns Err:502, rather than TRUE. The error is propagated rather than evaluated.
