# Convert a matrix's columns to list

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## Convert a matrix's columns to list

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## Re: Convert a matrix's columns to list

 Try this: c(unname(as.data.frame(a))) On Tue, Jan 18, 2011 at 10:53 AM, Feng Li <[hidden email]> wrote: > Dear R, > > Is there an efficient way to make a list that each element is from the > corresponding column of a matrix. For example, if I have a matrix "a" > > > a <- matrix(1:10, 5, 2) > > a >     [,1] [,2] > [1,]    1    6 > [2,]    2    7 > [3,]    3    8 > [4,]    4    9 > [5,]    5   10 > > I would like to have a list "b" like this > > > b <- list(a[, 1], a[, 2]) > > b > [[1]] > [1] 1 2 3 4 5 > > [[2]] > [1]  6  7  8  9 10 > > > Thanks in advance! > > > Feng > > -- > Feng Li > Department of Statistics > Stockholm University > 106 91 Stockholm, Sweden > http://feng.li/> >        [[alternative HTML version deleted]] > > ______________________________________________ > [hidden email] 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. > -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O         [[alternative HTML version deleted]] ______________________________________________ [hidden email] mailing list https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide http://www.R-project.org/posting-guide.htmland provide commented, minimal, self-contained, reproducible code.
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## Re: Convert a matrix's columns to list

 In reply to this post by Feng Li hi feng, a possible solution is b1<-apply(a,2,list) and possibly lapply(b1,unlist) if you want exactly the output equal to "list(a[, 1], a[, 2])" best, vito Il 18/01/2011 13.53, Feng Li ha scritto: > Dear R, > > Is there an efficient way to make a list that each element is from the > corresponding column of a matrix. For example, if I have a matrix "a" > >> a<- matrix(1:10, 5, 2) >> a >       [,1] [,2] > [1,]    1    6 > [2,]    2    7 > [3,]    3    8 > [4,]    4    9 > [5,]    5   10 > > I would like to have a list "b" like this > >> b<- list(a[, 1], a[, 2]) >> b > [[1]] > [1] 1 2 3 4 5 > > [[2]] > [1]  6  7  8  9 10 > > > Thanks in advance! > > > Feng > -- ==================================== Vito M.R. Muggeo Dip.to Sc Statist e Matem `Vianelli' Università di Palermo viale delle Scienze, edificio 13 90128 Palermo - ITALY tel: 091 23895240 fax: 091 485726/485612 http://dssm.unipa.it/vmuggeo______________________________________________ [hidden email] mailing list https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide http://www.R-project.org/posting-guide.htmland provide commented, minimal, self-contained, reproducible code.