# Natalie Pueyo

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## 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

Hello, 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 hard-coded value and m...

• Natalie Pueyo commented,

That's a really neat way to do it! Would I use an if-else 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 i-th object falls outside the k,l-th 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

Hello, 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

Hello, I have a makespan minimization MIP model which is getting stuck with no solution at very specific set values for upper variable bounds and big-M 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 if-conditional did decrease the model's rows by half, so something seems to have changed. How did you iden...

• Natalie Pueyo created a post,