Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>The <code>parseSMTLIB2[...]</code> methods should indeed have returned a <code>Z3AST</code>, thanks for reporting the problem. This is fixed in <a href="https://github.com/downloads/psuter/ScalaZ3/scalaz3-3.2.b.jar" rel="nofollow">scalaz3-3.2.b.jar</a>. Now regarding the use of the SMT-LIB 2 parser, I'm myself new to this, so Leo should perhaps confirm, but my understanding is that you should only use it to parse formulas, not to issue commands such as <code>(check-sat)</code>.</p> <p>Here is an example that works for me:</p> <pre><code>import z3.scala._ val smtlib2String = """ (declare-fun x () bool) (declare-fun y () bool) (assert (= x y)) (assert (= x true))""" val ctx = new Z3Context("MODEL" -&gt; true) val assertions = ctx.parseSMTLIB2String(smtlib2String) println(assertions) // prints "(and (= x y) (= x true))" ctx.assertCnstr(assertions) println(ctx.checkAndGetModel._1) // prints "Some(true)", i.e. SAT </code></pre> <p>Now if you want to programmatically recover the model for <code>x</code>, my understanding is that the only way to do it is to create a symbol for <code>x</code> <em>before</em> parsing and to pass it to the parser, using the overloaded definition of the <code>parseSMTLIB2[...]</code> method. Here is how you do it:</p> <pre><code>val ctx = new Z3Context("MODEL" -&gt; true) val xSym = ctx.mkStringSymbol("x") // should be the same symbol as in the SMT-LIB string val assertions = ctx.parseSMTLIB2String(smtlib2String, Map(xSym -&gt; ctx.mkBoolSort), Map.empty) ctx.assertCnstr(assertions) val model = ctx.checkAndGetModel._2 val xTree = ctx.mkConst(xSym, ctx.mkBoolSort) // need a tree to evaluate using the model println(model.evalAs[Boolean](xTree)) // prints "Some(true)" </code></pre> <p>Hope this helps.</p> <p>(Again, there may be a simpler way to do this, but I'm not aware of it. The parsing methods are directly bound to their C equivalent and the <a href="http://research.microsoft.com/en-us/um/redmond/projects/z3/group__capi__ex.html#ga748ec8e9525340e9237dee62cd589672" rel="nofollow">only example I could find</a> doesn't show much.)</p>
    singulars
    1. This table or related slice is empty.
    1. POScala^Z3 (Z3 Version 3.2) and parsesmtlib2string(...) not working
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USPhilippe
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POScala^Z3 (Z3 Version 3.2) and parsesmtlib2string(...) not working
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    1. COGreat Job! You also feature a function called ".checkAndGetAllModels()" for which I haven't even found a .NET or C equivalent... and it works just fine for me. How do you do that? Many Thanks. Levent Erkok asked for this feature in another post: "Z3: A better way to model?"
      singulars
      1. PO
      1. USJohn Smith
    2. COPhilippe is correct, the function `parseSMTLIB2String` is supposed to be used to parse formulas. Commands such as as `check-sat` are ignored by this command.
      singulars
      1. PO
      1. USLeonardo de Moura
    3. COThe checkAndGetAllModels function simply adds the negation of the previous models to the context, using pushes and pops, nothing too fancy. Btw, you probably shouldn't try to push new constraints between two calls to the resulting iterator.
      singulars
      1. PO
      1. USPhilippe
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload