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Swi Prolog Syntax Error Operator Expected


definition_clear_path( Node , J , Var ):- definition_clear_path1( Node , J , Var , [ Node ] ) . Eating Skittles Like a Normal Person How can I stun or hold the whole party? family_in_poverty(FamilyID) :- householdSize(FamilyID, 2), householdIncome(ID, X), X <= 15130. ........ Mon, 26 Sep 2005 21:40:52 GMT Bart Demoe#5 / 7 operator expected problem Quote: > > > rev([],[]). > > > rev([A|X],Z) :- rev(X,Y), append(Y,[A],Z). [...] Quote:> Thanks! > I http://allconverter.net/syntax-error/syntax-error-value-expected-c.html

For this particularpredicate, it's not an issue (each clause is fully guarded,the clauses should be reordered without changing the behaviour),but as a general rule, EVEN IN TURBO PROLOG, it is better And you cancombine it with giving advice to the application programmer.Runtime optimizations slow down another phase in the developmentcycle, and you might discover late a performance problem, because itwas not covered Which are the mistakes? But there is nothing "smart" about it, just a couple of 100s of LOC to implement some obvious source to source transformations.

Syntax Error: , Or ) Expected Prolog

There is no provision in the standard for default non-standard behaviour. –false Apr 29 '12 at 22:37 add a comment| up vote 0 down vote Simple rule-of-thumb in Prolog: the inequality How could I have modern computers without GUIs? Browse other questions tagged prolog or ask your own question. Cheers Bart Demoen Mon, 26 Sep 2005 23:48:35 GMT Duke Lu#6 / 7 operator expected problem Quote: > > > I save the rule and fact in a file: >

This is the last line, the column right before you open a bracket [ which you close with a parenthesis ). But Prolog doesn't know that. (I _think_ XSB Prolog > does or did know that; I know there was one Prolog that was smart > enough to more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed Singleton Variables Prolog The code above is TURBO-PROLOG.

But if you use Prolog terms without commas between them and they are NOT operators, then you will get the message "Error. The dash in your example is the problem (it seems alittle longer than the default one).Post by Vladimir MihailenkoCan you recomend some resources which explores SWI-Prolog syntax or providessome simple but Not the answer you're looking for? a discussion on vi belongs in comp.tools.unusable or something...

You used "[a b c d]" instead of "[a, b, c, d]". Prolog Not I was talking about *implementations*.And via a perfectly standard everyday metaphoric transfer,smartness *is* a property of Prolog *implementations*.Some of them. Fuchs Institut fr Informatik Universit?t Zrich Mon, 26 Sep 2005 00:34:39 GMT Martin Sondergaar#3 / 7 operator expected problem Quote:> I save the rule and fact in a file: > f(X, 4) :- X>=6. ?- between(1,10, X), f(X,Y).

No Permission To Redefine Imported Procedure

optimise/0 can be build on top of that.The possibility to deliver an optimized application end product mightalso influence the above choices ?Post by Jan Wielemaker2 ?- vm_list(min3).Relatively recent apparently - not Hit a curb today, taking a chunk out of the tire and some damage to the rim. Syntax Error: , Or ) Expected Prolog Its going to be infinitely... Syntax Of Prolog If that's so, then the cuts are in the wrong place.

In arithmetic comparison when comparing an integer and a float, the integer is first widened to a float. his comment is here is > 10 keeps its sign but its abs. There is no need to declare an argument's type before using it, as is generally required in other strongly-typed languages. % PREDICATES % f(integer, integer) % CLAUSES f(X, 0) :- share|improve this answer edited Apr 29 '12 at 22:02 answered Apr 29 '12 at 21:30 magus 982510 No, I'm still getting an error message. –user906153 Apr 29 '12 at Syntax Error Operator Expected Ocaml

I also suspect that it may be Windows-related.I suggest that FIGURE DASH, EN DASH, EM DASH, and HORIZONTAL BARshould be banned from Prolog source code except when quoted.Arguably U+2212 MINUS SIGN L = [-10,10,0,-3,10,10] sat is short for saturate: these rules alter a list of positive integers so that any element whose abs. use(t,4). this contact form Why are there no toilets on the starship 'Exciting Undertaking'?

optimise/0 can be build on top of that.I guess you need various interfaces, the bottom line of which isa predicate that takes a list of clauses and returns a new listof Prolog Not Equal Browse other questions tagged swi-prolog visual-prolog or ask your own question. family(38463, person(susan, rothchild, born(13, september, 1972), works(osu, 75000)), person(jess, rothchild, born(20, july, 1975), works(nationwide, 123500)), % here are the children... [person(ace, rothchild, born(2, january, 2010), unemployed)]).

pos_path(X,Y, [X,Y]):- edge(X,Y).

exists(Person) :- family(_, _, _, Children), member(Person, Children). That because arrows are useful to express logical properties. –CapelliC Sep 24 '13 at 16:00 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign of Computer Science, University of Beira Interior6201-001 Covilhã, PortugalOffice 3.18 Ext. 3276Phone: +351 275319891 Fax: +351 275319899Email: Home page: Research: Blog: ----------------------------------------------------------------- Richard O'Keefe 2009-10-28 20:58:04 UTC PermalinkRaw Message Post Prolog Examples def(d,1).

Arguably U+2212 MINUS SIGN should be treated as synonymous with U+002D HYPHEN-MINUS, but that's harder to set up than banning the U+2012..U+2015 range. _______________________________________________ SWI-Prolog mailing list [hidden email] https://mailbox.iai.uni-bonn.de/mailman/listinfo.cgi/swi-prolog Richard Can u say what is wrong with this code:min(X, Y, X) :- X <= Y.min(X, Y, Y) :- Y < X.ERROR: c:/users/admin/documents/q.pl:1:0: Syntax error: Operator expected% q compiled 0.00 sec, 824 I used PREDICATES and CLAUSES, because SWI-Prolog IDE properlyhighlights it like keywords. navigate here symptom(Patient,sneezing) :- write("Does ",Patient," have a sneezing (y/n) ?"), response(Reply), Reply='y'.

Browse other questions tagged prolog or ask your own question. Solutions Another thing that you might get complaints about are singleton variables; i.e., variables which are used only once in a clause. Here is the idea to do it:========== opt.pl ===========:- module(optimize,[ optimize_predicate/1]).:- meta_predicateoptimize_predicate(:).optimize_predicate(Module:Name/Arity) :-functor(Head, Name, Arity),findall((Head :- Body), clause(Module:Head, Body), Clauses),( optimize_clauses(Clauses, Optimized),\+ Clauses [email protected]= Optimized-> abolish(Module:Name/Arity),forall(member(C, Optimized),assert(Module:C)),compile_predicates([Module:Name/Arity]); true).optimize_clauses([( min(X,Y,Z) :- X edge(3,7).

And here, as another issue, you might want to cut (!) at the final of the predicate, otherwise Prolog because of backtracking will try the second go when it succeeds this And for a family of size >8 the poverty level is 38890 plus 3960 for every additional family member. Good for it! > > > But there is nothing "smart" about it, just a couple of 100s of LOC to > implement some obvious source to source transformations. It behaves such that the left hand side and the right hand side are evaluated arithmetically and then compared arithmetically.

min(X, Y, Y) :- Y < X. In the final step, it could rewrite thepredicates creating these choicepoints to avoid this in the future.Another trigger can be choice-points in childs that are deleted dueto -> or !.Note that of Computer Science, University of Beira Interior6201-001 Covilhã, PortugalOffice 3.18 Ext. 3276Phone: +351 275319891 Fax: +351 275319899Home page: Research: Blog: -----------------------------------------------------------------_______________________________________________SWI-Prolog mailing listhttps://mailbox.iai.uni-bonn.de/mailman/listinfo.cgi/swi-prolog--View this message in context: http://www.nabble.com/Newbie%3A-common-Syntax-error%3A-Operator-expected-tp26095829p26097523.htmlSent from the The current releases are 5.8.0 and 5.9.0 (well, the binaries arestill called 5.7.15; they will become 5.9.0 if the stack-shifter issufficiently stable).Cheers --- Jan Richard O'Keefe 2009-10-30 00:00:05 UTC PermalinkRaw Message

ERROR: user://1:88:0: Syntax error: Operator expected If you are not sure which operators your Prolog system supports, or which operators you have defined your self, you can list the current definitions symptom(Patient,conjunctivitis) :- write("Does ",Patient," have a conjunctivitis (y/n) ?"), response(Reply), Reply='y'. In theory, we could have a hook that is called whenevera predicate is `finished' (the code keeps track of a `current', soit can warn about discontiguous code). X = 1, Y = 0 ; X = 2, Y = 0 ; X = 3, Y = 2 ; X = 4, Y = 2 ; X = 5,

I also suspect that it may be Windows- related.