tag:blogger.com,1999:blog-593563533834706486.post1473593053162956135..comments2024-03-28T10:35:10.453-04:00Comments on Yet Another Math Programming Consultant: MTSP/VRP exampleErwin Kalvelagenhttp://www.blogger.com/profile/09496091402502236997noreply@blogger.comBlogger7125tag:blogger.com,1999:blog-593563533834706486.post-55800971381218777092019-05-06T19:33:21.370-04:002019-05-06T19:33:21.370-04:00Hola Enrique, estoy trabajando en un modelo con la...Hola Enrique, estoy trabajando en un modelo con las mismas características que las de tu modelo. Me puedes regalar si puedes el código, para compararlo con el mio, es que me arroja algunos problemas. GraciasMichaell Rojashttps://www.blogger.com/profile/10949762612078888794noreply@blogger.comtag:blogger.com,1999:blog-593563533834706486.post-27431151185326920822012-04-06T13:26:43.428-04:002012-04-06T13:26:43.428-04:00Hi, Erwin.
I´m working in a Vehicle Route Problem...Hi, Erwin.<br /><br />I´m working in a Vehicle Route Problem wiht Gams, but i have problems with subtour elimination constraints because I don´t know how to write it in Gams. Would you like to help me. My problem have 4 vehicules, 12 cities and 1 depot. <br />My imputs are demand for each city, distance between each city and capacity for each vehicle that is exactly the same for each one.<br /><br />I´ll apreciate your help.<br /><br />ThanksAnonymoushttps://www.blogger.com/profile/17676834901795932670noreply@blogger.comtag:blogger.com,1999:blog-593563533834706486.post-7658620441523531042012-03-25T23:56:59.997-04:002012-03-25T23:56:59.997-04:00Hi, Erwin!!
I´m working on a vrp capacitated, and...Hi, Erwin!!<br /><br />I´m working on a vrp capacitated, and i´m trying to add the aditional constraint to the model you shared, but i´ve had problems because I need to create a table with more than two dimentions that shows me capacity and cost at the same time. Do you have and example that could be helpful for me?<br /><br />Thank in advance, i apreciate your help.<br /><br />Juan Pablo CastroJuan Pablohttps://www.blogger.com/profile/15971125089615190652noreply@blogger.comtag:blogger.com,1999:blog-593563533834706486.post-39733877633990791902009-12-09T10:01:41.840-05:002009-12-09T10:01:41.840-05:00XY are indeed the coordinates. Data comes from TSP...XY are indeed the coordinates. Data comes from <a href="http://comopt.ifi.uni-heidelberg.de/software/TSPLIB95/" rel="nofollow">TSPLIB</a> (bayg29).Erwin Kalvelagenhttps://www.blogger.com/profile/09496091402502236997noreply@blogger.comtag:blogger.com,1999:blog-593563533834706486.post-78591923343796841582009-12-09T09:50:19.223-05:002009-12-09T09:50:19.223-05:00Hi! Great job, really! .
I´m working on a vrp wi...Hi! Great job, really! . <br /><br />I´m working on a vrp with time windows and I think yours is a great starting point. I just can't see how you compute the distance from the coordenates.. is it eucliedan distance?... I am assuming that table xy(i,*) are city's coordenates, right?<br /><br />Thanks!Anonymoushttps://www.blogger.com/profile/10334987371340221009noreply@blogger.comtag:blogger.com,1999:blog-593563533834706486.post-11308843080452199692009-10-16T19:44:43.563-04:002009-10-16T19:44:43.563-04:00For larger problems a simple single model may not ...For larger problems a simple single model may not work. I used different techniques based on genetic programming for some large practical MDVRP problems. See: <a href="http://www.amsterdamoptimization.com/pic/vrpprototype.png" rel="nofollow">http://www.amsterdamoptimization.com/pic/vrpprototype.png</a>.Erwin Kalvelagenhttps://www.blogger.com/profile/09496091402502236997noreply@blogger.comtag:blogger.com,1999:blog-593563533834706486.post-33609376480134771212009-10-16T16:28:15.990-04:002009-10-16T16:28:15.990-04:00hi , i saw your model seems very good, I know the ...hi , i saw your model seems very good, I know the mathematical model, heuristics, etc? are some examples for MDVRP? my email is juanmesab@gmail.comJuan Carlos Mesahttps://www.blogger.com/profile/15741834140818585928noreply@blogger.com