Ups... sorry, guys! Basic mistake: I forgot to look for the information in the help of the function.
Thank you, Gerrit, for the information! All the best! Charles On Wed, Jan 2, 2013 at 12:21 PM, Gerrit Eichner <gerrit.eich...@math.uni-giessen.de> wrote: > Hi, Charles, > > see > > ?which > > and learn about the argument arr.ind. > > Happy new year -- Gerrit > > > > On Wed, 2 Jan 2013, Charles Novaes de Santana wrote: > >> Dear all, Happy New Year for all of you! I hope we have an year of >> essential freedom for everyone! >> >> I am trying to manipulate a matrix in order to know in which column >> and in which row a number is allocated. But, when we use the function >> "which" it returns the position of the number in the "vector >> representation of the matrix". For example: >> >>> mata<-matrix(2:7,nrow=2,ncol=3) >>> mata >> >> [,1] [,2] [,3] >> [1,] 2 4 6 >> [2,] 3 5 7 >>> >>> matb<-matrix(2:7,nrow=3,ncol=2) >>> matb >> >> [,1] [,2] >> [1,] 2 5 >> [2,] 3 6 >> [3,] 4 7 >>> >>> which(mata==4) >> >> [1] 3 >>> >>> which(matb==4) >> >> [1] 3 >> >> The function "which" returns the position "3" for both, mata and matb, >> but If I didn't know that mata is a 2x3 matrix and matb is a 3x2, I >> wouldn't know that the number 4 is at the column 2 and row 1 of the >> mata and at the column 1 and row 3 of the matb. Do you know any way to >> know the column and the row of a number in a matrix automatically? >> >> Thanks, best regards, >> >> Charles >> >> >> -- >> Um axé! :) >> >> -- >> Charles Novaes de Santana >> http://www.imedea.uib-csic.es/~charles >> PhD student - Global Change >> Laboratorio Internacional de Cambio Global >> Department of Global Change Research >> Instituto Mediterráneo de Estudios Avanzados(CSIC/UIB) >> Calle Miquel Marques 21, 07190 >> Esporles - Islas Baleares - España >> >> Office phone - +34 971 610 896 >> Cell phone - +34 660 207 940 >> >> ______________________________________________ >> 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. -- Um axé! :) -- Charles Novaes de Santana http://www.imedea.uib-csic.es/~charles PhD student - Global Change Laboratorio Internacional de Cambio Global Department of Global Change Research Instituto Mediterráneo de Estudios Avanzados(CSIC/UIB) Calle Miquel Marques 21, 07190 Esporles - Islas Baleares - España Office phone - +34 971 610 896 Cell phone - +34 660 207 940 ______________________________________________ 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.
