[Cmpl] Fwd: Yet another probably basic question

[Mike Steglich]

Anfang der weitergeleiteten E-Mail:

> Von: Mike Steglich <mike.steglich at th-wildau.de>
> Betreff: Re: [Cmpl] Yet another probably basic question
> Datum: 18. September 2013 18:01:22 MESZ
> An: Michael Bond <mbond at videologygroup.com>
> Kopie: "cmpl at list.coin-or.org" <cmpl at list.coin-or.org>
> 
> You are right.  Sometimes I'm a little bit absentminded.
> 
> Am 18.09.2013 um 17:11 schrieb Michael Bond:
> 
>> I assume 'parameters:' should have been 'constraints:'. That seems to work, thank you.
>> 
>> ________________________________________
>> From: Mike Steglich <mike.steglich at th-wildau.de>
>> Sent: Wednesday, September 18, 2013 8:41 AM
>> To: Michael Bond
>> Cc: cmpl at list.coin-or.org
>> Subject: Re: [Cmpl] Yet another probably basic question
>> 
>> This Cmpl error is correct because an isolated parameter in an objective function doesn't have an impact on the solution. But to calculate the correct value you can formulate  your objective function as a equality constraint with a variable that is used as objective function …
>> 
>> e.g.:
>> 
>> variables:
>>       theValue : real;
>> objectives:
>>       theValue ->max;
>> parameters:
>>       sum{ t in T, s in S : I_ts[t,s] * c_s[s] * m_ts[t,s] } - sum{ t in T, s in S ,  r in R, k in K :   I[t,s] * c_s[s] * w_rtk[r,t,k] * x_rtk[r,t,k] } = theValue;
>> 
>> 
>> 
>> Am 18.09.2013 um 14:13 schrieb Michael Bond:
>> 
>>> This leads to the problem that the first sum{} does not have a variable which then produces the error 'Objective function is not well formed - Contains a constant parameter, which is ignored.'.
>>> 
>>> ________________________________________
>>> From: Mike Steglich <mike.steglich at th-wildau.de>
>>> Sent: Tuesday, September 17, 2013 11:29 AM
>>> To: Mike Steglich
>>> Cc: Michael Bond; cmpl at list.coin-or.org
>>> Subject: Re: [Cmpl] Yet another probably basic question
>>> 
>>> Sorry … there were a mistake with a }
>>> 
>>> The correct expression should be:
>>> sum{ t in T, s in S : I_ts[t,s] * c_s[s] * m_ts[t,s] } - sum{ t in T, s in S ,  r in R, k in K :   I[t,s] * c_s[s] * w_rtk[r,t,k] * x_rtk[r,t,k] }
>>> 
>>> Am 17.09.2013 um 17:25 schrieb Mike Steglich:
>>> 
>>>> sum{ t in T, s in S : I_ts[t,s] * c_s[s] * m_ts[t,s] - sum{ t in T, s in S ,  r in R, k in K :   I[t,s] * c_s[s] * w_rtk[r,t,k] * x_rtk[r,t,k] } }
>>> This email is intended only for the use of the individual(s) to whom it is addressed. If you have received this communication in error, please immediately notify the sender and delete the original email.
>>> 
>>> _______________________________________________
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>>> Cmpl at list.coin-or.org
>>> http://list.coin-or.org/mailman/listinfo/cmpl
>> 
>> This email is intended only for the use of the individual(s) to whom it is addressed. If you have received this communication in error, please immediately notify the sender and delete the original email.
>> 
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> 

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