On Aug 12, 2010, at 11:30 AM, Martin Tomko wrote:
>
> c<-scan(file=f,what=list(c("",(rep(integer(0),cols)))), skip=1)
> m<-matrix(c, nrow = rows, ncol=cols,byrow=TRUE);
>
> for some reason I end up with a character matrix, which I don't want. Is this
> the proper way to skip the first column (this is not documented anywhere -
> how does one skip the first column in scan???). is my way of specifying
> "integer(0)" correct?
No. Well, integer(0) is just superfluous where 0L would do, since scan only
looks at the types not the contents, but more importantly, what= wants a list
of as many elements as there are columns and you gave it
> list(c("",(rep(integer(0),5))))
[[1]]
[1] ""
I think what you actually meant was
c(list(NULL),rep(list(0L),5))
>
> And finally - would any sparse matrix package be more appropriate, and can I
> use a sparse matrix for the image() function producing typical heat,aps? I
> have seen that some sparse matrix packages produce different looking outputs,
> which would not be appropriate.
>
> Thanks
> Martin
>
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--
Peter Dalgaard
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Email: pd....@cbs.dk Priv: pda...@gmail.com
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