function h = hessinterior(x,lambda)
%
h = [60*x(1)+2*x(3),2*x(2),2*x(1);
    2*x(2),2*(x(1)+x(3)),2*x(2);
    2*x(1),2*x(2),0];% Hessian of f
r = sqrt(x(1)^2+x(2)^2);% radius
rinv3 = 1/r^3;
hessc = [(x(2))^2*rinv3,-x(1)*x(2)*rinv3,0;
    -x(1)*x(2)*rinv3,x(1)^2*rinv3,0;
    0,0,0];% Hessian of both c(1) and c(2)
h = h + lambda.ineqnonlin(1)*hessc + lambda.ineqnonlin(2)*hessc;

