R help - Feb 2012 - What is the fastest way to combine all columns of a matrix to one column?

Dear all,

Newbie: What is the fastest way to combine all columns of a matrix to one
column?

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Hi
> 
> Dear all,
> 
> Newbie: What is the fastest way to combine all columns of a matrix to 
one
> column?
If mm is your matrix use

dim(mm) <-NULL

Regards
Petr

> 
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> 
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> 
> ______________________________________________
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> PLEASE do read the posting guide 
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> and provide commented, minimal, self-contained, reproducible code.

Hi
> Hi,
> 
> Thank you. I actually wanted to reserve the rows, I dont know how to
> do this with
> dim(mm) <-NULL
I do not understand. What does it mean reserve rows. Matrix is a vector 
with dimension so you can change dimensions freely with 

dim(mm) <- any suitable combination

dim(mm) <-NULL

gives you plain vector

dim(mm) <- c(rows, columns)

gives you now matrix with specified number of rows and columns. You can 
put columns to 1 and in that case you will get one column matrix.

Please provide some toy example what do you really want.

Regards
Petr

> 
> thanks again
> 
> 
> On 2/27/12, Petr PIKAL <petr.pikal at precheza.cz> wrote:
> > Hi
> >>
> >> Dear all,
> >>
> >> Newbie: What is the fastest way to combine all columns of a matrix
to
> > one
> >> column?
> >
> > If mm is your matrix use
> >
> > dim(mm) <-NULL
> >
> > Regards
> > Petr
> >
> >
> >>
> >> --
> >> View this message in context: 
http://r.789695.n4.nabble.com/What-is-the-
> >>
> > fastest-way-to-combine-all-columns-of-a-matrix-to-one-column-
> tp4423882p4423882.html
> >> Sent from the R help mailing list archive at Nabble.com.
> >>
> >> ______________________________________________
> >> 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.
> >
> >

On 27/02/12 20:57, ali_protocol wrote:
> Dear all,
>
> Newbie: What is the fastest way to combine all columns of a matrix to one
> column?
What (on earth!) do you mean  by ``combine''?  *You* understand
what you mean; I doubt that anyone else does.  For Pete's sake, if
you are going to ask a question, make it clear what the <expletive
deleted> you are asking!

A self-contained reproducible example always helps.

     cheers,

         Rolf Turner