Include a log function in the utility function

[yufei xu]

Dear Professor Bierlaire,

I am trying to use a log function in the utility function for the destination choice model. The utility function will look like: U = a1x1+ a2x2 + log(a3x3+a4x4), where a and x are coefficients and variables respectively. I would like to know if Biogeme allows me to do so.

Thanks,

Yufei

[Bierlaire Michel]

Yes. Just import the “log” function from “biogeme.expressions” module. 

from biogeme.expressions import log

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