exp（850）How do I solve this problem,

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Hello Because of the following formula, For D33 ,when (xr+12) > 0, then yr>-∞,and that will cause the following solution to fail. For D11 when (xr+12) > 0,then yr<∞,and that will also cause the following solution to fail.How do I solve this problem, or how do I set limits

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You can add a constraint to your AMPL model to set a lower bound or an upper bound on a variable, or on an expression involving variables. For example,

s.t. xr_bound {i in D3 union D333, j in IP}:
   xr[i,j] + 12 <= 0;