Hi,I want to use "alldifferent" constraint or a "distinct" constraint but in my case, i have a matrix M and i would that the elements (values) of the row of a matrix be different, but the variables of the row can have positive and negative values, so i would have a constraint that for example: if row = 1 then the absolute values of M[1, j] could be all different, that means, if i have M[1,1]=(-3), i should not get M[1,j] =(+3) for j =1 to n. alldifferent (|M[i, j]|). My question is how to write this constraint in Gecode ?.Best regards. Sabrina
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