Hi Chandler, <[EMAIL PROTECTED]>
It looks to me that you are reversing the arguments to the nth$ function. Pass the index of the element you want to retrieve first, then pass the list itself. See http://www.jessrules.com/jess/docs/70/functions.html#nth$
BTW - If your intention is to access numbers stored in a list, then it is better practice to explicitly define an unordered fact template with a multislot to hold the list. I'm fairly sure that Ernest has advocated this as a best practice. Also, if you look at the current JessDE, the editor will create an implicit deftemplate for all ordered facts anyway.
Here is a short program (attached) to illustrate my points. Notice the output and the usage of both ordered and unordered facts.
Cheers,
Jason
-----------------------------------------------------------
Jason C. Morris
Worcester Polytechnic Institute Phone: (508) 831-5006
Department of Computer Science FAX: (508) 831-5776
Fuller Laboratories - Room 312 [EMAIL PROTECTED]
Artificial Intelligence Lab (AIRG)
100 Institute Road
Worcester, MA 01609-2280
-----------------------------------------------------------
hello all,
I have an ordered fact which is declared on the spot...so for that..
whatever information I insert, is entered in the multislot __data
Later on in program. I want to extract information from this slot, which is
fine (NO PROBLEMS)... but things returned are like list... and say if one of
the items in the list is a number which I want to use for a specific purpose
say addition to some other number....
I get error like "watever number" is a list, not a number...
how can I obtain the number from that list and use it for say addition,
multiplication ?
I tried.. something like (nth$ (getSlotValue __data) 1) - didnt work
Pleas help... I want to use an ordered fact and be able to use that value
from __data, but I get held at "is a list , not a number"
--
View this message in context: http://www.nabble.com/multislot-__data-question-tf2146010.html#a5924517
Sent from the Jess forum at Nabble.com.
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-----------------------------------------------------------
Jason C. Morris
Worcester Polytechnic Institute Phone: (508) 831-5006
Department of Computer Science FAX: (508) 831-5776
Fuller Laboratories - Room 312 [EMAIL PROTECTED]
Artificial Intelligence Lab (AIRG)
100 Institute Road
Worcester, MA 01609-2280
-----------------------------------------------------------
getMultislotItem.clp
Description: Binary data
