On Aug 12, 2010, at 1:34 PM, Martin Tomko wrote: > Hi Peter, > thank you for your reply. I still cannot get it to work. > I have modified your code as follows: > rows<-length(R) > cols <- max(unlist(lapply(R,function(x) length(unlist(gregexpr(" > ",x,fixed=TRUE,useBytes=TRUE))))))
Notice that the above is completely useless to the reader unless you tell us what R is (except for a statistical programming language ;-)) > c<-scan(file=f,what=rep(c(list(NULL),rep(list(0L),cols-1),rows-1)), skip=1) What's the outer rep() and rows-1 doing in there???! Notice that the parentheses don't match up as I think you think they do, so there's really only one argument to rep(), making it a no-op. The rows-1 is going inside the c, which might be causing the apparent extra column. And the number of rows should not affect 'what=' anyway. Now if you had done what I wrote... > m<-matrix(c, nrow = rows-1, ncol=cols+1,byrow=TRUE); If you make a matrix from a list, odd things will happen. You need an unlist(c). And more than likely NOT byrow=TRUE. However, I think do.call(cbind,c) should do the trick more easily. > > the list c seems ok, with all the values I would expect. Still, length(c) > gives me a value = cols+1, which I find odd (I would expect =cols). > I thine repeated it rows-1 times (to account for the header row). The values > seem ok. > Anyway, I tried to construct the matrix, but when I print it, the values are > odd: > > m[1:10,1:10] > [,1] [,2] [,3] [,4] [,5] [,6] [,7] > [1,] NULL Integer,15 Integer,15 Integer,15 Integer,15 Integer,15 Integer,15 > [2,] NULL Integer,15 Integer,15 Integer,15 Integer,15 Integer,15 Integer,15 > [3,] NULL Integer,15 Integer,15 Integer,15 Integer,15 Integer,15 Integer,15 > [4,] NULL Integer,15 Integer,15 Integer,15 Integer,15 Integer,15 Integer,15 > [5,] NULL Integer,15 Integer,15 Integer,15 Integer,15 Integer,15 Integer,15 > [6,] NULL Integer,15 Integer,15 Integer,15 Integer,15 Integer,15 Integer,15 > [7,] NULL Integer,15 Integer,15 Integer,15 Integer,15 Integer,15 Integer,15 > [8,] NULL Integer,15 Integer,15 Integer,15 Integer,15 Integer,15 Integer,15 > [9,] NULL Integer,15 Integer,15 Integer,15 Integer,15 Integer,15 Integer,15 > [10,] NULL Integer,15 Integer,15 Integer,15 Integer,15 Integer,15 Integer,15 > .... > > Any idea where the values are gone? > Thanks > Martin > > Hence, I filled it into the matrix of dimensions > > On 8/12/2010 12:24 PM, peter dalgaard wrote: >> 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 >>> >>> ______________________________________________ >>> R-help@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. >>> >> > > > -- > Martin Tomko > Postdoctoral Research Assistant > > Geographic Information Systems Division > Department of Geography > University of Zurich - Irchel > Winterthurerstr. 190 > CH-8057 Zurich, Switzerland > > email: martin.to...@geo.uzh.ch > site: http://www.geo.uzh.ch/~mtomko > mob: +41-788 629 558 > tel: +41-44-6355256 > fax: +41-44-6356848 > -- 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 ______________________________________________ R-help@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.