Why 'neq' is not '!eq'

[Artem Novikov]

CLIPS> (eq nil nil nil)

TRUE

CLIPS> (eq nil nil 1)

FALSE

CLIPS> (neq nil nil nil)

FALSE

CLIPS> (neq nil nil 1)

FALSE

CLIPS> 

Why  (neq nil nil 1) return false?

[CLIPS Support]

From the 6.3 Basic Programming Guide (http://clipsrules.sourceforge.net/documentation/v630/bpg.pdf):

12.1.12 Comparing for Inequality

The neq function returns the symbol TRUE if its first argument is not equal in value to all its subsequent arguments, otherwise it returns the symbol FALSE. 

[Artem Novikov]

..t is not equal in value to all its subsequent arguments..

CLIPS> (neq nil 1 1)

TRUE

ok, works fine

воскресенье, 24 мая 2015 г., 23:26:09 UTC+3 пользователь CLIPS Support написал:

[Joshua Scoggins]

In fact, (not (neq ?a (expand$ $?args))) is an easy way to see if the first arg is equal to one of the other arts.