R help - Aug 2007 - Slack variable in OR

Hi dear R users,
   
  Is it basically correct that a problem is ( linearly on nonlinearly ) modeled
so that the slack variable is bounded by an upper bound ?
   
  If so, how it can be handled and coded practically ?
   
  for example:
   
  x1+ x2 =< b   so ---->  x1 + x2 + s=b
   
  s=b- x1 - x2
   
  b- x1 - x2 =< upper value
   
  But algorithms can not calculate b- x1 - x2 , because the matrices are not
compatible. Or how can it be well coded ?
   
  Thank you so much.
  Amir

       
---------------------------------
Boardwalk for $500? In 2007? Ha! 

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hi Amir

please see inline answers



Amir Safari <amsa36060@yahoo.com> 
Sent by: r-help-bounces@stat.math.ethz.ch
08/14/2007 02:37 PM

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Subject
[R] Slack variable in OR






 
 
     Hi dear R users,
 
@@@ although i have not understood your problemos clearly whatever i can 
help, i will tell

  Is it basically correct that a problem is ( linearly on nonlinearly ) 
modeled so that the slack variable is bounded by an upper bound ? 
 
  If so, how it can be handled and coded practically ?
 
  for example:
 
  x1+ x2 =< b   so ---->  x1 + x2 + s=b
 
  s=b- x1 - x2
 
  b- x1 - x2 =< upper value
@@@ i assume that x1 and x2 are >= 0, which is usually the case
@@@ then in that case if both x1=x2=0 then x3=50 .... which is its meximum 
value 
  But algorithms can not calculate b- x1 - x2 , because the matrices are 
not compatible. Or how can it be well coded ?
 @@@ where are the matrices i am just asking :-) 
  Thank you so much.
  Amir

 
---------------------------------
Boardwalk for $500? In 2007? Ha! 

                 [[alternative HTML version deleted]]

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