# Soufyan Zayou

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Votes on activity by Soufyan Zayou
• Hi, As compared to simplex, where the method would generally require lots of relatively inexpensive iterations, the barrier will require much fewer iteration but each one of those is much more expe...

• Hi, No, it was expected that the computational complexity would scale linearly with the prediction horizon  N, i.e. O(N) for a sparse QP problem, so the slope of the line is linear in logartimic sc...

• Hi, Thanks for your response. Still one general question about Gurobi (you maybe know from experience). I have some general questions about the barrier algoritm that Gurobi uses to solve a QP. For ...

• Hi,  I have re-scaled the model, but the numerical issues are still present.  Do you have any other options I could try? What did you by the way mean with: border-line with the round-off error in d...

• Part 2: In more detail, after some substitution the quadritic part of the optimization problem looks like:  with Z a banded null-space matrix, Omega a diagonal matrix with transpose(H)*Q*H  and R ...

• Hi, Thanks for the clarification. I forgot to give you more information. Part 1: The optimization problem I am solving could be seen below: with zi|k = H*xi|k, ui|k the predicted inputs, xi|k the ...

• Hello Yuriry, Does the QObjective range specify the range of the elements in the Hessian? Is is somewhat the same as the condition number of the Hessian? The right-hand side of the inequality const...

• Hello Yuriy, Thanks for your reply.  I don't really understand the last sentence of your answer: ''indeed, linear algebra --a driving engine, so to speak-- behind the barrier is often more efficien...

• Hi Silke, Thanks for your response. I have still a couple of questions based on your answer. Which numerical properties may change when you use scaling? Could you give examples? Furthermore, you sa...

• This is the output file, where it is stated that is a suboptimal solution. Does anyone know what is wrong? Gurobi Optimizer version 9.0.0 build v9.0.0rc2 (win64)Optimize a model with 1200 rows, 600...