Hi,
   
  I want to find solution of function :  f(x,y) = x'Cx - a under constraints :
   
  0 < x,y < p
  0 < x-y< q
   
  where a, p,q are given constants and x = (x, y) and C is a 2X2 matrix (given)
   
  Can anyone suggest me any R function to do that?
   
   

       
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