forum.polymake.org

I am fairly new to polymake. I was reading Section 6 of the article "Tropical Convex Hull Computations". They suggest the following code, but it does not run. Any help will be appreciated it. If it helps, I am running polymake version 2.13 in Ubuntu.
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~$ polymake -A tropical
tropical > $p = new TropicalPolytope<Rational>(POINTS => [[0,3,6],[0,5,2],[0,0,1],[1,5,0]]);
tropical > print @{rows_labeled($p->PSEUDOVERTICES)};
polymake: used package cddlib
Implementation of the double description method of Motzkin et al.
Copyright by Komei Fukuda.
http://www.ifor.math.ethz.ch/~fukuda/cdd_home/cdd.html

polymake: ERROR: Can't use string ("10") as an ARRAY ref while "strict refs" in use.

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What is the meaning of this message? How can I fix it?

Thanks!

Hello,

please consider upgrading your polymake version.
The line in question was written for a very old polymake version 2.9.4 and with version 2.13 should work as follows: A more up to date reference for similar computations is our tutorial on application tropical. Note that the code on that page requires polymake version 3.0.

Best,
Benjamin

Dear Benjamin,

Thank you! The code runs. I once tried to update my polymake, but after two hours in forums, instructions, commands, etc.. I could not do it. Of course, every computer is different and little problems may appear in each one. Now, I am running the code in cloud.sagemath.com. I will write them for upgrading their polymake version.

Best