LOGICAL SPL Directory

The Logical directory contains functions useful in testing values for finite, infinite, empty, nan, complex, real and string types. The following functions are included:

FINITE	Returns 1 where series is finite.
ISCOMPLEX	Returns 1 if input is complex.
ISEMPTY	Returns 1 if series is empty.
ISFINITE	Returns 1 where series is finite
ISFUNC	Returns 1 if input is a loaded SPL function name
ISINF	Returns 1 where input is infinite.
ISNAN	Returns 1 where input is NA.
ISNUMERIC	Returns 1 is input is numeric
ISREAL	Returns 1 if input is real
ISSCALAR	Returns 1 if input is a scalar
ISSTRING	Returns 1 if input is a string
ISUNIT	Returns 1 if input is a units
ISWINDOW	Returns 1 if input is a window
ISWINEMPTY	Returns 1 if window does not contain a series
ISXY	Returns 1 if input is an XY series