# Matthias Miltenberger

Gurobi Staff

Gurobi Optimization Support Manager - Berlin, Germany

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## Activity overview

Latest activity by Matthias Miltenberger
• Matthias Miltenberger commented,

One more piece of advice, Yu: You can use LaTeX directly in our Community Forum as explained here: Posting to the Community Forum This is a lot less work than copy-pasting mathematical notation as ...

• Matthias Miltenberger commented,

Thanks for the additional information, Robert! I also noticed the different parameters being used in AMPL but wanted to make sure that at least the model that is being solved is identical for both ...

• Matthias Miltenberger commented,

Hi Jonas(z) :-) This should be possible in C++ as well by reallocating the variables array and filling up the new slots with newly created variables. Or you set up the variable array large enough i...

• Matthias Miltenberger commented,

Hi Dávid, Please make sure that the file path does not contain any non-ASCII characters - this can easily lead to errors when trying to parse the path. I know, it's 2022 and we should expect a wide...

• Matthias Miltenberger commented,

Hi Manuel, The R API is passing data directly to Gurobi's C API:   No intermediate files will be created to pass the data. Cheers,Matthias

• Matthias Miltenberger commented,

Hi Jingyue, This is a Python error message indicating that you are trying to convert the empty string $$\texttt{''}$$ to an int. You should check the values of your table before converting them. Ch...

• Matthias Miltenberger commented,

Hi Manuel, I don't see the issue - the logs are showing identical behavior even down to the number of simplex iterations required to reach optimality. You may get different results in later iterati...

• Matthias Miltenberger commented,

Hi Manuel, Apparently, you are solving two very different models. The AMPL model has 71 constraints while the R model has 82 constraints and more than twice the number of nonzeros. Additionally, yo...

• Matthias Miltenberger commented,

Hi Ashraf, hi Jonasz, Unfortunately, there is no direct or built-in way to query when a solution has been found. You might want to look into Gurobi/grblogtools: Extract and visualize information fr...

• Matthias Miltenberger commented,

Hi Geoffrey! Most likely, there is an empty line in your text file. You would need to catch this edge case to avoid such errors. Maybe it makes sense to look into some existing parsers, e.g., from ...