[Ipopt] Step Sizes and Values of Primal and Dual Variables at Every Iteration

[Senses,Begum]

Hello everyone,

I am interested in the step sizes and values of primal and dual 
variables at every ipopt iteration. When I set file_print_level to 12, 
ipopt prints the step sizes(delta) and values(curr_x). I was expecting 
to observe that curr_x(at the (k+1)th iteration) - curr_x(at the kth 
iteration) = delta_x(at the kth iteration). I also tried curr_x(at the 
(k+1)th iteration) - curr_x(at the kth iteration) = alpha_pr * 
delta_x(at the kth iteration).  But none of these equations is 
satisfied. Can someone explain to me why these equations are not 
satisfied?

Thank you.
-- 
Senses, Begum