IsNull
- check for Null (empty) value

Miscellaneous functions
(AmiBroker 4.30)

SYNTAX IsNull( x )
RETURNS NUMBER, ARRAY
FUNCTION this function is synonym of IsEmpty(). Gives True if value is equal to Null (empty) value.
EXAMPLE movagv = ma( close, 30 );
WriteIF( IsNull( movavg ), "Moving average not available yet", WriteVal( movavg ) );
SEE ALSO ISEMPTY() function

References:

The IsNull function is used in the following formulas in AFL on-line library:

More information:

See updated/extended version on-line.