Re: [R] Matrix to Vector

From: steven mosher <moshersteven_at_gmail.com>
Date: Sat, 05 Jun 2010 12:03:42 -0700

 I bet that is what I did.

On Sat, Jun 5, 2010 at 11:54 AM, John Kane <jrkrideau_at_yahoo.ca> wrote:

> m<-matrix(seq(1,48),nrow=6,byrow=T)
> as.vector(t(m))
>
> gives me the correct result.
>
> Any chance you may have already transformed m ?
>
> --- On Sat, 6/5/10, steven mosher <moshersteven_at_gmail.com> wrote:
>
> > From: steven mosher <moshersteven_at_gmail.com>
> > Subject: Re: [R] Matrix to Vector
> > To: "Henrique Dallazuanna" <wwwhsd_at_gmail.com>
> > Cc: r-help_at_r-project.org
> > Received: Saturday, June 5, 2010, 2:44 PM
> > as.vector(t(m))
> > [1] 1 9 17 25 33 41 2 10 18 26 34
> > 42 3 11 19 27 35 43 4 12 20 28 36 44
> > 5 13 21 29 37 45 6 14 22 30 38 46 7 15 23 31
> > 39 47 8 16 24
> > [46] 32 40 48
> >
> > the result I want is this:
> >
> > [1] 1 2 3 4 5 6
> > 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
> > 24
> > 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44
> > 45
> > [46] 46 47 48
> >
> >
> >
> > On Sat, Jun 5, 2010 at 11:17 AM, Henrique Dallazuanna
> > <wwwhsd_at_gmail.com>wrote:
> >
> > > Try this:
> > >
> > > as.vector(t(m))
> > >
> > > On Sat, Jun 5, 2010 at 3:12 PM, steven mosher <moshersteven_at_gmail.com
> >wrote:
> > >
> > >> Given a matrix of m*n, I want to reorder it as a
> > vector, using a row major
> > >> transpose.
> > >>
> > >> so:
> > >>
> > >> > m<-matrix(seq(1,48),nrow=6,byrow=T)
> > >> > m
> > >> [,1] [,2] [,3] [,4] [,5]
> > [,6] [,7] [,8]
> > >> [1,] 1 2
> > 3 4 5 6
> > 7 8
> > >> [2,]
> > 9 10 11 12 13 14 15 16
> > >>
> > [3,] 17 18 19 20 21 22 23 24
> > >>
> > [4,] 25 26 27 28 29 30 31 32
> > >>
> > [5,] 33 34 35 36 37 38 39 40
> > >>
> > [6,] 41 42 43 44 45 46 47 48
> > >>
> > >> I want to reorder this as a vector copying by row,
> > so that the final
> > >> vector
> > >> has elements ordered thusly: row 1, column 1:N
> > (m[1,1:n]) maps to
> > >> row 1-n, and m[2,1:n] maps to row[n+1:2n] ...
> > >>
> > >> this obviously is not a solution: as the inherent
> > column major storage
> > >> paradigm of a matrix
> > >> defeats the approach.
> > >> > dim(m)<-c(48,1)
> > >> > m
> > >> [,1]
> > >> [1,] 1
> > >> [2,] 9
> > >> [3,] 17
> > >> [4,] 25
> > >> [5,] 33
> > >> [6,] 41
> > >> [7,] 2
> > >> [8,] 10
> > >> [9,] 18
> > >> [10,] 26
> > >> [11,] 34
> > >> [12,] 42
> > >> [13,] 3
> > >> [14,] 11
> > >> [15,] 19
> > >> [16,] 27
> > >> [17,] 35
> > >> [18,] 43
> > >> [19,] 4
> > >> [20,] 12
> > >> [21,] 20
> > >> [22,] 28
> > >> [23,] 36
> > >> [24,] 44
> > >> [25,] 5
> > >> [26,] 13
> > >> [27,] 21
> > >> [28,] 29
> > >> [29,] 37
> > >> [30,] 45
> > >> [31,] 6
> > >> [32,] 14
> > >> [33,] 22
> > >> [34,] 30
> > >> [35,] 38
> > >> [36,] 46
> > >> [37,] 7
> > >> [38,] 15
> > >> [39,] 23
> > >> [40,] 31
> > >> [41,] 39
> > >> [42,] 47
> > >> [43,] 8
> > >> [44,] 16
> > >> [45,] 24
> > >> [46,] 32
> > >> [47,] 40
> > >> [48,] 48
> > >>
> > >>
> > >> I already have a version that loops through the
> > data ( this is actually a
> > >> portion of a data frame ) to reorder
> > >> this into a vector, but I was hoping there was an
> > elegant way
> > >>
> > >> [[alternative HTML
> > version deleted]]
> > >>
> > >> ______________________________________________
> > >> R-help_at_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.
> > >>
> > >
> > >
> > >
> > > --
> > > Henrique Dallazuanna
> > > Curitiba-Paraná-Brasil
> > > 25° 25' 40" S 49° 16' 22" O
> > >
> >
> > [[alternative HTML version deleted]]
> >
> >
> > -----Inline Attachment Follows-----
> >
> > ______________________________________________
> > R-help_at_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.
> >
>
>
>

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