"Line Search and Merit Function: The solution to the QP subproblem produces a vector dk, which is used to form a new iterate" and then "The step length parameter ?k is determined in order to produce a sufficient decrease in a merit function."
But I don't really understand.
In fact I did find out that RelLineSrchBnd does affect the stepsize in the iteration, but not as much as I expected. For example, when I set RelLineSrchBnd=0.01 then the change in the x-values in the first iteration only seem to get smaller by factor 10 (where I expected a factor 100).
Maybe you can explain in more simple words what RelLineSrchBnd does? What it means in practice? And why is the stepsize in the iteration only affected so little?)