# [R] Issue on LGP solving

PIKAL Petr petr.pikal at precheza.cz
Wed Sep 21 08:52:05 CEST 2016

```Hi

> -----Original Message-----
> From: Dr. Debasis Ghosh [mailto:deb at debasis.in]
> Sent: Tuesday, September 20, 2016 3:59 PM
> To: PIKAL Petr <petr.pikal at precheza.cz>; R-help at r-project.org
> Subject: RE: [R] Issue on LGP solving
>
> Thanks Petr!! However, I found in the goalprog package I found
> "achievements" as "a  data frame with the deviation variables for each
> objective together with the priority level". I defined
>
> > p1<-c(2,0,0,0,0,0)
> > p2 <- c(0,0,0,0,1,0)
> > p3<- c(0,0,0,0,0,1)
> > achievement <- data.frame(p1,p2,p3)
>
> Here p1, p2 and p3 are the 3 priority levels.
>
> I understand the problem is at "achievement" data frame. To your point,
> data frame with four named columns (objective, priority, p and n), how
> these four columns are defined ?

I have no idea as I never used this package. It was just my guess from difference between your call and manual pages I found on internet.
If I were you I would go through help pages for the package and tried to understand what is going on.
If I did not understand it I would try to find some extended tutorial about this method.
If I did not find anything I would either gave up or seek some help from local statistical expert or contacted maintainer of this package.

Cheers
Petr

>
> Appreciate your time Petr. Thanks again!!
>
> Regards,
> Debasis Ghosh, Ph.D
>
> -----Original Message-----
> From: PIKAL Petr [mailto:petr.pikal at precheza.cz]
> Sent: Tuesday, September 20, 2016 6:55 AM
> To: Dr. Debasis Ghosh; R-help at r-project.org
> Subject: RE: [R] Issue on LGP solving
>
> Hi
>
> Just a wild guess. Achievement in the goalprog package is data frame with
> four named columns (objective, priority, p and n).
>
> Your achievement is 3 column data.frame with names p1, p2 and p3.
>
> Maybe data frame with defined structure is required.
>
> Cheers
> Petr
>
>
> > -----Original Message-----
> > From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Dr.
> > Debasis Ghosh
> > Sent: Tuesday, September 20, 2016 8:12 AM
> > To: R-help at r-project.org
> > Subject: [R] Issue on LGP solving
> >
> > I was solving a LGP problem which is very basic.
> >
> >
> >
> > Find x0 = [x1; x2], n0 = [n1; n2; n3] and p0 = [p1; p2; p3] that
> > minimize a = [(2p1); (n2); (n3)]
> >
> > The objectives are as follows
> >
> > 10x1 + 15x2 + n1 - p1 = 40
> >
> > 100x1 + 100x2 + n2 - p2 = 1000
> >
> > x2 + n3 - p3 = 7
> >
> > x; n; p >= 0
> >
> > The solution is x' = [4; 0] and a = [0; 600; 7]
> >
> >
> >
> >
> >
> > > local({pkg <- select.list(sort(.packages(all.available =
> > TRUE)),graphics=TRUE)
> >
> > + if(nchar(pkg)) library(pkg, character.only=TRUE)})
> >
> > > local({pkg <- select.list(sort(.packages(all.available =
> > TRUE)),graphics=TRUE)
> >
> > + if(nchar(pkg)) library(pkg, character.only=TRUE)})
> >
> >
> >
> >
> >
> > > coeff<-matrix (c(10,15,100,100,0,1), nrow=3, ncol=2, byrow=TRUE)
> >
> > > target<-c(40,1000,7)
> >
> > > p1<-c(2,0,0,0,0,0)
> >
> > > p2 <- c(0,0,0,0,1,0)
> >
> > > p3<- c(0,0,0,0,0,1)
> >
> > > achievement <- data.frame(p1,p2,p3)
> >
> > > achievement
> >
> >   p1 p2 p3
> >
> > 1  2  0  0
> >
> > 2  0  0  0
> >
> > 3  0  0  0
> >
> > 4  0  0  0
> >
> > 5  0  1  0
> >
> > 6  0  0  1
> >
> > > llgp(coeff,target,achievement)
> >
> >
> >
> > Do you have any idea why I am seeing below error ?
> >
> >
> >
> >
> >
> > Error in matrix(0, nrow = levels, ncol = nonbasics) :
> >
> >   invalid 'nrow' value (too large or NA)
> >
> > In addition: Warning messages:
> >
> > 1: In max(achievements\$priority) :
> >
> >   no non-missing arguments to max; returning -Inf
> >
> > 2: In matrix(0, nrow = levels, ncol = nonbasics) :
> >
> >   NAs introduced by coercion to integer range
> >
> >
> >
> > Regards,
> >
> > Debasis Ghosh, Ph.D
> >
> >
> >
> >
> >       [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
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> > PLEASE do read the posting guide http://www.R-project.org/posting-
> > guide.html and provide commented, minimal, self-contained,
> > reproducible code.
>
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________________________________
Tento e-mail a jakékoliv k němu připojené dokumenty jsou důvěrné a jsou určeny pouze jeho adresátům.
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Nejste-li zamýšleným adresátem tohoto emailu, nejste oprávněni tento email jakkoliv užívat, rozšiřovat, kopírovat či zveřejňovat.
Odesílatel e-mailu neodpovídá za eventuální škodu způsobenou modifikacemi či zpožděním přenosu e-mailu.

V případě, že je tento e-mail součástí obchodního jednání:
- vyhrazuje si odesílatel právo ukončit kdykoliv jednání o uzavření smlouvy, a to z jakéhokoliv důvodu i bez uvedení důvodu.
- a obsahuje-li nabídku, je adresát oprávněn nabídku bezodkladně přijmout; Odesílatel tohoto e-mailu (nabídky) vylučuje přijetí nabídky ze strany příjemce s dodatkem či odchylkou.
- trvá odesílatel na tom, že příslušná smlouva je uzavřena teprve výslovným dosažením shody na všech jejích náležitostech.
- odesílatel tohoto emailu informuje, že není oprávněn uzavírat za společnost žádné smlouvy s výjimkou případů, kdy k tomu byl písemně zmocněn nebo písemně pověřen a takové pověření nebo plná moc byly adresátovi tohoto emailu případně osobě, kterou adresát zastupuje, předloženy nebo jejich existence je adresátovi či osobě jím zastoupené známá.

This e-mail and any documents attached to it may be confidential and are intended only for its intended recipients.
If you received this e-mail by mistake, please immediately inform its sender. Delete the contents of this e-mail with all attachments and its copies from your system.
If you are not the intended recipient of this e-mail, you are not authorized to use, disseminate, copy or disclose this e-mail in any manner.
The sender of this e-mail shall not be liable for any possible damage caused by modifications of the e-mail or by delay with transfer of the email.

In case that this e-mail forms part of business dealings:
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```