*------------------------------------------------------------ * December 26, 1997 * Brown - Bartholomew-Biggs * ODE vs SQP methods for constrained optimisation, * Technical Report No.179, June 1987. * The Hatfield Polytechnic, UK. * * Problem 11 ("Witch of Agnesi") * * Project: Test Problems with SPENBAR * * Dr. Neculai Andrei * Research Institute for Informatics, * 8-10, Averescu Avenue, Bucharest 1, Romania * E-mail: nandrei@u3.ici.ro * web: www.ici.ro/camo *------------------------------------------------------------ * subroutine ini(n,m,mb,me,sb,x,icgc,ipgc,icge,ipge, 1 nszc,nsze,nb) * double precision x(n) integer sb(mb) integer icgc(nszc),ipgc(n+1) integer icge(nsze),ipge(n+1) * * Information about the problem. * write(1,10) 10 format(5x,'Example of nonlinear programming.') write(1,11) 11 format(5x,'Problem 11, Brown - Bartholomew-Biggs, ') write(1,14) 14 format(5x,'Witch of Agnesi') * * Dimension of the problem: * n=2 ! No. of variables. m=0 ! No. of inequality constraints. me=1 ! No. of equality constraints. mb=2*n ! No. of simple bounds on variables. nszc=0 ! No. of non-zeros in Jacobian of c(x)>=0. nsze=2 ! No. of non-zeros in Jacobian of e(x) =0. * * Initial point: * x(1)=1.d0/12.d0 x(2)=10.d0 * * Index vector for simple bounds: cb >= 0. * j=1 do i=1,n sb(j)=i sb(j+1)=-i j=j+2 end do * * Rows indices of the nonzeros of the Jacobian of the equalities * icge(1)=1 icge(2)=1 * * Starting address of columns of the Jacobian of the equalities * ipge(1)=1 ipge(2)=2 ipge(3)=3 * * Rows indices of the nonzeros of the Jacobian of the INEqualities * * * Starting address of columns of the Jacobian of the INEqualities * return end *-------------------------------------------------------------- * BB11 Brown - Bartholomew-Bigs *-------------------------------------------------------------- * subroutine prob(n,m,mb,me,sb,x,objf,gobj,c,gc,cb,e,ge, 1 nszc,nsze,nb) * * Calculate problem function at iterate x. * double precision x(n),objf,gobj(n),c(m),gc(nszc) double precision cb(mb),e(me),ge(nsze) real*8 t * * * Objective function and its gradient: * objf=-x(1) * gobj(1)=-1.d0 gobj(2)= 0.d0 * * Bounds on variables: * j=1 do i=1,n cb(j)=x(i) cb(j+1)=100.d0-x(i) j=j+2 end do * * Constraints. (Inequalities): * * * Jacobian of the inequalities constraints: * * * Constraints. (Equalities): * t=dexp(8.d0 - 4.d0*x(1) - x(1)*x(2)*x(2)) e(1)=t - 1.d0 * * Jacobian of the equalities constraints: * ge(1)= t*(-4.d0 - x(2)**2) ge(2)= t*(-2.d0*x(1)*x(2)) * return end *------------------------------------------------BB11.for