Error in Biogeme Notebook: TypeError when Running bio.BIOGEME()

[Henry Dao]

Hello,

I am new to Biogeme and am currently exploring the package. I have been given a notebook that was used in previous semesters, so I believe it should work. However, when I run the code, I encountered an error. Specifically, when I run bio.BIOGEME(bgm_swissmetro, V), I receive the following error:

TypeError: object of type 'int' has no len()

In my code, V is a list, and bgm_swissmetro is a Biogeme database. See the screenshot for more detail.

Could you please help me resolve this issue?

[Michel Bierlaire]

V must be a dict associationg the id of the alternatives with their arithmetic expression.

Look at the online examples:
https://biogeme.epfl.ch/sphinx/examples.html


https://biogeme.epfl.ch/sphinx/auto_examples/swissmetro/plot_b01logit.html#sphx-glr-auto-examples-swissmetro-plot-b01logit-py

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Michel Bierlaire
Transport and Mobility Laboratory
School of Architecture, Civil and Environmental Engineering
EPFL - Ecole Polytechnique Fédérale de Lausanne
http://transp-or.epfl.ch
http://people.epfl.ch/michel.bierlaire