Ah, it works. I was using lapply and it doesn't seem to work. Thank you!-----
Original Message -----From: François Pinard Date: Sunday, August 19, 2007 8:36
pmSubject: Re: [R] how to collapse a list of 1 column matrix to a matrix?To:
[EMAIL PROTECTED]: r-help@stat.math.ethz.ch> [EMAIL PROTECTED]> > >I encounter
a situation where I have a list whose element is a > column > >matrix. Says,> >
>$'1'> >[,1]> >1> >2> >3> > >$'2'> >[,1]> >4> >5> >6> > >Is there fast way to
collapse the list into a matrix like a > cbind > >operation in this case?
Meaning, the result should be a matrix > that > >looks like: > > > [,1]
[,2]> >[1,] 1 4> >[2,] 2 5> >[3,] 3 6> > >I can loop
through all elements and do cbind manually. But I > think > >there must be a
simpler way that I don't know. Thank you.> > The "do.call" function is the R
equivalent of the "apply" from > many > other languages. I guess that, in R,
"apply" was already taken > :-)> For example:> > > a = list(x=matrix(1:3, 3,
1), y=matrix(4:6, 3, 1))> > a> $x> [,1]> [1,] 1> [2,] 2> [3,] 3> >
$y> [,1]> [1,] 4> [2,] 5> [3,] 6> > > do.call(cbind, a)> [,1]
[,2]> [1,] 1 4> [2,] 2 5> [3,] 3 6> > > -- > François Pinard
http://pinard.progiciels-bpi.ca>
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