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+// Copyright (C) 2015 - IIT Bombay - FOSSEE
+//
+// Author: Harpreet Singh
+// Organization: FOSSEE, IIT Bombay
+// Email: harpreet.mertia@gmail.com
+// This file must be used under the terms of the CeCILL.
+// This source file is licensed as described in the file COPYING, which
+// you should have received as part of this distribution.  The terms
+// are also available at
+// http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
+
+
+function [xopt,fopt,exitflag,output,lambda] = qpipopt (varargin)
+  // Solves a linear quadratic problem.
+  //
+  //   Calling Sequence
+  //   xopt = qpipopt(nbVar,nbCon,Q,p,LB,UB,conMatrix,conLB,conUB)
+  //   [xopt,fopt,exitflag,output,lamda] = qpipopt( ... )
+  //   
+  //   Parameters
+  //   nbVar : a 1 x 1 matrix of doubles, number of variables
+  //   nbCon : a 1 x 1 matrix of doubles, number of constraints
+  //   Q : a n x n symmetric matrix of doubles, where n is number of variables, represents coefficients of quadratic in the quadratic problem.
+  //   p : a 1 x n matrix of doubles, where n is number of variables, represents coefficients of linear in the quadratic problem
+  //   LB : a 1 x n matrix of doubles, where n is number of variables, contains lower bounds of the variables.
+  //   UB : a 1 x n matrix of doubles, where n is number of variables, contains upper bounds of the variables.
+  //   conMatrix : a m x n matrix of doubles, where n is number of variables and m is number of constraints, contains  matrix representing the constraint matrix 
+  //   conLB : a m x 1 matrix of doubles, where m is number of constraints, contains lower bounds of the constraints. 
+  //   conUB : a m x 1 matrix of doubles, where m is number of constraints, contains upper bounds of the constraints.
+  //   xopt : a 1xn matrix of doubles, the computed solution of the optimization problem.
+  //   fopt : a 1x1 matrix of doubles, the function value at x.
+  //   exitflag : Integer identifying the reason the algorithm terminated.
+  //   output : Structure containing information about the optimization.
+  //   lambda : Structure containing the Lagrange multipliers at the solution x (separated by constraint type).
+  //   
+  //   Description
+  //   Search the minimum of a constrained linear quadratic optimization problem specified by :
+  //   find the minimum of f(x) such that 
+  //
+  //   <latex>
+  //    \begin{eqnarray}
+  //    &\mbox{min}_{x}
+  //    & 1/2*x'*Q*x + p'*x  \\
+  //    & \text{subject to} & conLB \leq C(x) \leq conUB \\
+  //    & & lb \leq x \leq ub \\
+  //    \end{eqnarray}
+  //   </latex>
+  //   
+  //   We are calling IPOpt for solving the quadratic problem, IPOpt is a library written in C++. The code has been written by ​Andreas Wächter and ​Carl Laird.
+  //
+  // Examples
+  //      //Find x in R^6 such that:
+  //      
+  //      conMatrix= [1,-1,1,0,3,1;
+  //                 -1,0,-3,-4,5,6;
+  //                  2,5,3,0,1,0
+  //                  0,1,0,1,2,-1;
+  //                 -1,0,2,1,1,0];
+  //      conLB=[1;2;3;-%inf;-%inf];
+  //      conUB = [1;2;3;-1;2.5];
+  //      lb=[-1000 -10000 0 -1000 -1000 -1000];
+  //      ub=[10000 100 1.5 100 100 1000];
+  //      //and minimize 0.5*x'*Q*x + p'*x with
+  //      p=[1 2 3 4 5 6]; Q=eye(6,6);
+  //      nbVar = 6;
+  //      nbCon = 5;
+  //      [xopt,fopt,exitflag,output,lambda]=qpipopt(nbVar,nbCon,Q,p,lb,ub,conMatrix,conLB,conUB)
+  //    
+  // Examples 
+  //	Q = [1 -1; -1 2]; 
+  //	p = [-2 -6];
+  //	conMatrix = [1 1; -1 2; 2 1];
+  //	conUB = [2; 2; 3];
+  //	conLB = [-%inf; -%inf; -%inf];
+  //	lb = [0 0];
+  //	ub = [%inf %inf];
+  //	nbVar = 2;
+  //	nbCon = 3;
+  //    [xopt,fopt,exitflag,output,lambda] = qpipopt(nbVar,nbCon,Q,p,lb,ub,conMatrix,conLB,conUB)
+  // 
+  // Authors
+  // Keyur Joshi, Saikiran, Iswarya, Harpreet Singh
+    
+    
+//To check the number of input and output argument
+   [lhs , rhs] = argn();
+	
+//To check the number of argument given by user
+   if ( rhs ~= 9 ) then
+    errmsg = msprintf(gettext("%s: Unexpected number of input arguments : %d provided while should be 9"), "qpipopt", rhs);
+    error(errmsg)
+   end
+   
+   
+   nbVar = varargin(1);
+   nbCon = varargin(2);
+   Q = varargin(3);
+   p = varargin(4);
+   LB = varargin(5);
+   UB = varargin(6);
+   conMatrix = varargin(7);
+   conLB = varargin(8);
+   conLB = conLB';	//IPOpt wants it in row matrix form 
+   conUB = varargin(9);
+   conUB = conUB';	//IPOpt wants it in row matrix form
+   
+
+   //Checking the Q matrix which needs to be a symmetric matrix
+   if ( Q~=Q') then
+      errmsg = msprintf(gettext("%s: Q is not a symmetric matrix"), "qpipopt");
+      error(errmsg);
+   end
+
+   //Check the size of Q which should equal to the number of variable
+   if ( size(Q) ~= [nbVar nbVar]) then
+      errmsg = msprintf(gettext("%s: The Size of Q is not equal to the number of variables"), "qpipopt");
+      error(errmsg);
+   end
+   
+   //Check the size of p which should equal to the number of variable
+   if ( size(p,2) ~= [nbVar]) then
+      errmsg = msprintf(gettext("%s: The Size of p is not equal to the number of variables"), "qpipopt");
+      error(errmsg);
+   end
+   
+   
+   //Check the size of constraint which should equal to the number of variables
+   if ( size(conMatrix,2) ~= nbVar) then
+      errmsg = msprintf(gettext("%s: The size of constraints is not equal to the number of variables"), "qpipopt");
+      error(errmsg);
+   end
+
+   //Check the size of Lower Bound which should equal to the number of variables
+   if ( size(LB,2) ~= nbVar) then
+      errmsg = msprintf(gettext("%s: The Lower Bound is not equal to the number of variables"), "qpipopt");
+      error(errmsg);
+   end
+
+   //Check the size of Upper Bound which should equal to the number of variables
+   if ( size(UB,2) ~= nbVar) then
+      errmsg = msprintf(gettext("%s: The Upper Bound is not equal to the number of variables"), "qpipopt");
+      error(errmsg);
+   end
+
+   //Check the size of constraints of Lower Bound which should equal to the number of constraints
+   if ( size(conLB,2) ~= nbCon) then
+      errmsg = msprintf(gettext("%s: The Lower Bound of constraints is not equal to the number of constraints"), "qpipopt");
+      error(errmsg);
+   end
+
+   //Check the size of constraints of Upper Bound which should equal to the number of constraints
+   if ( size(conUB,2) ~= nbCon) then
+      errmsg = msprintf(gettext("%s: The Upper Bound of constraints is not equal to the number of constraints"), "qp_ipopt");
+      error(errmsg);
+   end
+    
+   [xopt,fopt,status,iter,Zl,Zu,lmbda] = solveqp(nbVar,nbCon,Q,p,conMatrix,conLB,conUB,LB,UB);
+   
+   xopt = xopt';
+   exitflag = status;
+   output = struct("Iterations"      , []);
+   output.Iterations = iter;
+   lambda = struct("lower"           , [], ..
+                   "upper"           , [], ..
+                   "constraint"      , []);
+   
+   lambda.lower = Zl;
+   lambda.upper = Zu;
+   lambda.constraint = lmbda;
+    
+
+endfunction