Thank you for pointing out this problem. I'll create a PR.

Best,
Daniel

Am Dienstag, 3. Januar 2017 04:07:44 UTC+1 schrieb Ce Qin:
>
> Dear Daniel,
>
> It works now. I made a mistake before. Thank you for your help.
>
> Best,
> Ce Qin
>
> 2017-01-02 23:35 GMT+08:00 Daniel Arndt <d.a...@math.uni-goettingen.de 
> <javascript:>>:
>
>> Ce Qin,
>>
>> Removing the assertion works, but it will cause a problem. Since the 
>>> ConstraintMatrix internally uses local_lines to determine the position 
>>> of a ConstraintLine, we can not insert new line or query an 
>>> existing line anymore.
>>>
>> The attached examples works for me as far as I can tell. There a IndexSet 
>> is created, copied, shifted and merged with the original one.
>> Similarly, a ConstraintMatrix is created, copied, shifted and merged with 
>> the original one. Furthermore, in the resulting ConstraintMatrix
>> another constraint is added. What kind of error do you observe when 
>> inserting a new line? 
>>
>> Best,
>> Daniel
>>
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>

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