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February 2016

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November 2013

Hi!

My classmate and I got a problem with the demand-supply interaction where we are supposed to do our calculations with congestion. We don't know how we will set up the t_car and the c_car values.

When we are trying to run the program with the t_car and c_car that we used the if-statement is never met and we get stuck in a while-loop. The difference between time and t_car doesn't seem to vary.

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Ludvig Jangenstål posted 20 November 2013

Coralie Duranton commented 23 November 2013

Hello,

maybe we have the same problem :

Out of the while-loop, I try to run the Assignment function : [time, distance, flow] = Assignment(Tij_car, A, D, cap, toll). When I run it step by step, I get stuck in the function 'num2cell.m'.
So, have you succeeded in running this Assignment function once out of the while-loop ? If yes, good for you. If not, we have maybe the same problem : please can you run it step by step to see where you get stuck ?

See you, Coralie

Yujin Zhang commented 30 November 2013

Hi!

We also had the same problem as Ludvig so we decided to display max(max(abs(time-t_car))) to check what the maximum difference bewteen time and t_car was after e.g. 100 iterations. From that, we found that after about 100 iterations, the maximum difference was about 85 minutes so therefore we set the condition to 85 instead of 0.1. When we looked at the matrix "time-t_car" after the optimzation, we found that most routes had a travel time difference of either aruond 5 minutes or less than 1 minutes EXCEPT for trips from zone 6, where the differences were about 85 minutes.