On 04-03-2014, at 12:38, klq...@mail.bg wrote: > I don't have any cost function to minimize. My task is to create the "best" > matrix, matching the row sums, the column sums, row sumproducts (with the > rows from another constant matrix) and also column sumproducts - it's a > transportation problem of finding OD matrix corresponding the total tonnage > and tonne-kilometres. Maybe the more suitable function would be "lsei", but > it retuns also negative values for some X-es. Do you have an idea where in > the code to put some verification for non-negative results? >
From the manual entry of lsei it seems that you should specify matrix G and vector h (inputs of lsei). Berend PS: Please do not post in HTML (see the posting guide). > Thanks in advance. > > Best Regards. > > > ----- Цитат от Berend Hasselman (b...@xs4all.nl), на 27.02.2014 в 21:09 ----- > >> >> On 27-02-2014, at 13:22, klq...@mail.bg wrote: >> >>> >>> >>> >>> Dear R users, >>> >>> >>> I have to find optimal solution of an underdetermined linear system, but >>> only with positive variables. I tried the function from this post >>> https://stat.ethz.ch/pipermail/r-help/2007-October/143408.html , but it's >>> solution includes also negative values. >>> >>> >> >> Have a look at package limSolve. Maybe (and only maybe) function linp can be >> of use. >> >> Berend >> >>> Thanks in advance. >>> >>> >>> Best Regards. >>> >>> ------------------------------------- >>> >>> Майски празници на остров Лефкада, Гърция от 158 евро >>> Безкрайните романтични пясъци съчетани с узо... >>> Дати: 30/04/14 - 05/04/14 >>> http://www.arrivalsidi.com/%D0%BC%D0%B0%D0%B9%D1%81%D0%BA%D0%B8-%D0%BF%D1%80%D0%B0%D0%B7%D0%BD%D0%B8%D1%86%D0%B8/%D0%BC%D0%B0%D0%B9%D1%81%D0%BA%D0%B8-%D0%BF%D1%80%D0%B0%D0%B7%D0%BD%D0%B8%D1%86%D0%B8-%D0%B2-%D0%BB%D0%B5%D1%84%D0%BA%D0%B0%D0%B4%D0%B0 >>> [[alternative HTML version deleted]] >>> >>> ______________________________________________ >>> R-help@r-project.org mailing list >>> https://stat.ethz.ch/mailman/listinfo/r-help >>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html >>> and provide commented, minimal, self-contained, reproducible code. >> >> > > > > ------------------------------------- > Mail.BG: Безплатен e-mail адрес. Най-добрите характеристики на българския > пазар - 20 GB пощенска кутия, 1 GB прикрепен файл, безплатен POP3, мобилна > версия, SMS известяване и други. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
