Hi James,
please see below for the answers to the respective questions.
1. Yes. The factor is supplied to the sumo --scale option (see docs
<https://sumo.dlr.de/docs/sumo.html#processing> ).
3. I cannot give you a good advice here, I believe. Maybe others can step
in...
4. This is because of the extremely short simulation duration during which
no vehicle manages to arrive at its destination. In your case --time-inc 5
means simulating 5s...
Best regards
Mirko
-----Original-Nachricht-----
Betreff: Re: [sumo-user] Questions about duaiterate.py
Datum: 2023-09-13T15:53:55+0200
Von: "James Cheng" <[email protected]>
An: "Mirko Barthauer" <[email protected]>
Hi Mirko,
Thank you for your reply! I have a few follow up questions:
1. Can you expand on what you mean by traffic volume scaling? Is it
essentially the number of vehicles that would be in the simulation?
For example, if there are originally 2 vehicles but the scaling
min(options.incStart + options.incValue * float(step + 1) /
options.incBase, options.incMax) = 1/2 would result in 2*(1/2) = 1
vehicle in the simulation.
2. This works, thank you!
3. I don't believe you answered this question, any insight would be
appreciated: How do we tell if the iterations have reached an
equilibrium? Which output variable should we observe?
4. Attached is a sample file tripinfo_000.xml, which does not seem to
have a duration section. How can I make sure it has a duration
section?
1. here is the command I am running for reference "python
../sumo/tools/assign/duaIterate.py -n siouxFalls.net.xml -t
siouxFalls.trips.xml -l 10 --max-convergence-deviation 1
--convergence-iterations 2 --addweights siouxFalls.weight.xml
--time-inc 5"
5. Got it, thanks!
Please let me know if you have any additional insight. Thank you so much!
Best,
James
On Tue, Sep 12, 2023 at 1:01 AM Mirko Barthauer <[email protected]
<mailto:[email protected]> > wrote:
Hi James,
you can discover more about the duaiterate.py options by calling it with
--help. Many of your questions are addressed on this doc page
<https://sumo.dlr.de/docs/Demand/Dynamic_User_Assignment.html#iterative_assignment_dynamic_user_equilibrium>
.
1. --inc* options are about traffic volume scaling and provide components
of the scale equation used in duaiterate: If --inc-base is defined, it's
min(options.incStart + options.incValue * float(step + 1) /
options.incBase, options.incMax), --inc-max otherwise. --time-inc
(seconds) is about the simulation duration defined by the equation
options.timeInc * (step + 1).
2. Options for duarouter can be passed by prepending "duarouter" to them
and putting them at the end of the options. So it should read something
like "duarouter--weight-attribute cost"
4. Could be that the duration section is missing. Cannot say more without
the files.
5. Currently not possible.
Best regards
Mirko
-----Original-Nachricht-----
Betreff: [sumo-user] Questions about duaiterate.py
Datum: 2023-09-07T22:10:50+0200
Von: "James Cheng via sumo-user" <[email protected]
<mailto:[email protected]> >
An: "Sumo project User discussions" <[email protected]
<mailto:[email protected]> >
Dear SUMO Staff,
I am trying to use duaiterate.py and I have a few questions regarding its
use:
1. I am running into issues caused by long iteration times and am
looking into ways to speed up iterations. What do the following
flags do (short description) and what are their units (i.e.
seconds, minutes, etc.)? Is there an example usage of these or is
there a directory that contains more info about these flags that we
can refer to?
* --inc-start, --inc-base, --inc-max, --incrementation,
--time-inc
1. I’m trying to add weights for the duarouter section because I would
like to use my own definition of cost = travel time + tolling as a
weight. I am using the “--addweights” flag with a weight file for
the additional weights, but how do I specify the weight attribute?
1. Using duarouter, I was able to do “--weight-attribute cost”,
but is there a flag like that for duaiterate.py?
2. How do we tell if the iterations have reached an equilibrium? Which
output variable should we observe?
3. When I run
python ../sumo/tools/assign/duaIterate.py -n siouxFalls.net.xml -t
siouxFalls.trips.xml -l 10 --max-convergence-deviation 1
--convergence-iterations 2 --addweights siouxFalls.weight.xml --time-inc
5"
I get the following error after running through iteration 000:
File "...\sumo\tools\assign\duaIterate.py", line 688, in main
avgTT.add(sum / count)
ZeroDivisionError: float division by zero
I am not sure why the count variable is zero – could it be that my
tripinfo_000.xml does not have a duration section? I would like to use
the “--max-convergence-deviation” flag to automatically stop iterations
after converging, but I am not sure how to fix this division by zero
error.
1. How do we store the duaiterate dump folders (e.g. 000, 001, 002,
etc.) in a separate folder such as a dump_folder folder? Currently,
it is dumping them into the current directory.
Please advise us on these questions, and let us know if you have any
clarifications. Thank you so much for your help!
Best,
James
--
James Cheng
B.A. Computer Science and B.S. Business Administration
University of California, Berkeley
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