incorrect range of variable 'step' in escape.mzn

[JenkinsY94]

In line 13 of file escape.mzn , the variable is declared as: var int: step;. The scale is not precise enough. When I fixed the edge with uedge, as shown in the debugging tutorial, the model output a wrong answer and printed step = 11 rather than step = 9 as expected.

I think we should either change this line of code to var STEP: step; or add another constraint: constraint path[maxstep] = dest; in order to get the right answer.

Hope this helps. :)

[pstuckey]

On 1 Oct 2016, at 2:31 pm, JenkinsY94 [email protected] wrote:

In line 13 of file escape.mzn , the variable is declared as: var int: step;. The scale is not precise enough. When I fixed the edge with uedge, as shown in the debugging tutorial, the model output a wrong answer and printed step = 11 rather than step = 9 as expected.

I think we should either change this line of code to var STEP: step; or add another constraint: constraint path[maxstep] = dest; in order to get the right answer.

Hope this helps. :)

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I agree. But arguably this is just another bug in the initial model.

The code form escape-fixed uses the declaration

var STEP: step;

But I agree its not the point of the lecture, so I have modified the example code

[vitorsr]

Related: somehow escape.dzn has an invalid character (invisible space) which is forbidden under certain circumstances in certain operating systems.

Edit: in the filename.