Natalie Pueyo
 Total activity 14
 Last activity
 Member since
 Following 0 users
 Followed by 0 users
 Votes 0
 Subscriptions 4
Activity overview
Latest activity by Natalie Pueyo
Natalie Pueyo commented,
Hi Jaromil, The link you provided helped me determine that the lower bound I was using was wrong. I kept having trouble with that until I found a simpler version of the constraints which work: m.a...

Natalie Pueyo created a post,
Affect binary value only when continuous variable is negative
AnsweredHello, Is it possible to create a constraint where a continuous variable can only affect a binary variable's value if the continuous variable is negative? I want to replace a hardcoded value and m...

Natalie Pueyo commented,
That's a really neat way to do it! Would I use an ifelse statement to set the respective cases, something like: if Z[i] > top_edge[l]: x[k,l,i].UB= 0 Since it depends on the l, i, and k to deter...

Natalie Pueyo commented,
Hi Marika, When you mention these variables, which ones do you mean? The x[k,l,i] variable when the ith object falls outside the k,lth arm's work area? If so, how would I do this? I just tried us...

Natalie Pueyo created a post,
How to change constraints to make model feasible/bounded
AnsweredHello, I'm trying to add a couple of constraints to my model, but they result in an unfeasible/unbounded model. The idea is to have constraints that limits robot arms set in a matrix to their respe...

Natalie Pueyo commented,
Hi Jaromił, Adding the bounds to tw_s and tw_e sped up solving for three arms below 0.9 m/s v_vy upper bound. Adding NoRelTime = 800s, led to finding solutions very quickly (all, except one, below ...

Natalie Pueyo commented,
Hi Jaromil, Thanks for the reply! The gap isn't between solving quickly and solving after hours. It's between getting a solution (usually within 300 seconds) or not getting anything (after more tha...

Natalie Pueyo created a post,
MIP model gets stuck at very specific variable bound values
AnsweredHello, I have a makespan minimization MIP model which is getting stuck with no solution at very specific set values for upper variable bounds and bigM values. I'm not sure if it's numerical issues...

Natalie Pueyo commented,
Hi Maliheh! Thank you for your reply, unfortunately the results are still zero. Adding the ifconditional did decrease the model's rows by half, so something seems to have changed. How did you iden...

Natalie Pueyo created a post,
Unable to get results for existing MIP model
AnsweredHi, I'm trying to use Gurobi to solve an existing MIP model (found in page 403 of https://link.springer.com/content/pdf/10.1007/s1084601502115.pdf): \[\max \sum_{k=1}^{K} \sum_{i=1}^{N} x^{k}_{i...