[BioC] snpMatrix - Creating a 1-column snp.matrix by subsetting a larger snp.matrix

[Vincent Carey 525-2265]

use the old chestnut [,1,drop=FALSE]

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Vince Carey, PhD
Assoc. Prof Med (Biostatistics)
Harvard Medical School
Channing Laboratory - ph 6175252265 fa 6177311541
181 Longwood Ave Boston MA 02115 USA
stvjc at channing.harvard.edu

On Wed, 4 Jun 2008, Richard Pearson wrote:

> Is there any way of subsetting a snp.matrix on just one column, and ending up with a snp.matrix object (rather than a snp object)? Put another way, is there a way of coercing a snp object to be a snp.matrix object? The following example might illustrate the sort of thing I'm trying to do:
>
> > library(snpMatrix)
> > data(testdata)
> > subsets <- list("none" = NULL, "one" = 1, "two" = 1:2)
> > sapply(subsets, function(x) class(Autosomes[,x]))
>         none          one          two
> "snp.matrix"        "snp" "snp.matrix"
>
> I couldn't find anything in the documentation, and am struggling figuring out how to do this by coercing to a regular matrix and then back.
>
> Thanks
>
> Richard
>
> --
> Richard D. Pearson             richard.pearson at postgrad.manchester.ac.uk
> School of Computer Science,    http://www.cs.man.ac.uk/~pearsonr
> University of Manchester,      Tel: +44 161 275 6178
> Oxford Road,                   Mob: +44 7971 221181
> Manchester M13 9PL, UK.        Fax: +44 161 275 6204
>
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