Re: [Rd] is.vector(as.vector(x)) is FALSE
Uwe Ligges <[EMAIL PROTECTED]> writes: > ... I think I'd rather expect that > >as.vector(x1mat, mode = "list") > > also removes the dim attributes. Just checked, Splus seems to satisfy is.vector(as.vector(x)) for list matrices and data frames. The R docs have 'as.vector', a generic, attempts to coerce its argument into a vector of mode 'mode' (the default is to coerce to whichever mode is most convenient). The attributes of 'x' are removed. so I think there is a case for deeming the current behaviour to be a bug... -- O__ Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 __ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
Re: [Rd] is.vector(as.vector(x)) is FALSE
Achim, you are right, in principle, but I think I'd rather expect that as.vector(x1mat, mode = "list") also removes the dim attributes. Uwe Achim Zeileis wrote: On Sun, 17 Oct 2004 01:51:47 + (UTC) Gabor Grothendieck wrote: The following, which was recently discussions on the rcom-l list, is a situation where coercing x1mat to a vector using as.vector results in an object that is.vector says is not a vector: R> x1mat<-matrix(list(1,1.1,1+1i,"a",NA,NaN), 3, 2) R> is.vector(as.vector(x1mat)) [1] FALSE If you give it a particular mode, it produces a vector: R> as.vector(x1mat, mode = "character") [1] "1""1.1" "1+1i" "a""NA" "NaN" R> as.vector(x1mat, mode = "numeric") [1] 1.0 1.1 1.0 NA NA NaN Warning messages: 1: imaginary parts discarded in coercion 2: out-of-range values treated as 0 in coercion to raw A somewhat similar and simpler example is: R> x <- data.frame(a = 1:5, b = 6:10) R> is.vector(as.vector(x)) [1] FALSE because data.frames are also already vectors of mode "list". The man page of as.vector provides a similar example with: R> as.vector(x, mode = "numeric") Error in as.vector(x, mode = "numeric") : (list) object cannot be coerced to double I had discussed this with Kurt (and maybe R-devel, but I cannot find it in the archives) some time ago and the bottom line--if I recall correctly--was that is.vector() and as.vector() do not behave in the way that is.vector(as.vector(x)) always gives TRUE (or an error). Z __ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-devel __ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
Re: [Rd] is.vector(as.vector(x)) is FALSE
On Sun, 17 Oct 2004 01:51:47 + (UTC) Gabor Grothendieck wrote: > > The following, which was recently discussions on the rcom-l list, > is a situation where coercing x1mat to a vector using as.vector > results in an object that is.vector says is not a vector: > > R> x1mat<-matrix(list(1,1.1,1+1i,"a",NA,NaN), 3, 2) > R> is.vector(as.vector(x1mat)) > [1] FALSE If you give it a particular mode, it produces a vector: R> as.vector(x1mat, mode = "character") [1] "1""1.1" "1+1i" "a""NA" "NaN" R> as.vector(x1mat, mode = "numeric") [1] 1.0 1.1 1.0 NA NA NaN Warning messages: 1: imaginary parts discarded in coercion 2: out-of-range values treated as 0 in coercion to raw A somewhat similar and simpler example is: R> x <- data.frame(a = 1:5, b = 6:10) R> is.vector(as.vector(x)) [1] FALSE because data.frames are also already vectors of mode "list". The man page of as.vector provides a similar example with: R> as.vector(x, mode = "numeric") Error in as.vector(x, mode = "numeric") : (list) object cannot be coerced to double I had discussed this with Kurt (and maybe R-devel, but I cannot find it in the archives) some time ago and the bottom line--if I recall correctly--was that is.vector() and as.vector() do not behave in the way that is.vector(as.vector(x)) always gives TRUE (or an error). Z __ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
Re: [Rd] is.vector(as.vector(x)) is FALSE
I would have thought it would be an error to attempt and fail. Actually, to make it a vector all that has to be done is to zap the dim attribute: dim(x1mat) <- NULL # now its a vector It seems to know how to do that in the case of an atomic matrix, just not a non-atomic one. Here it is for an atomic matrix where it does return TRUE: is.vector(as.vector(matrix(1:12,4))) # TRUE uni-bayreuth.de> writes: : : maybe, the point is that is.vector "attempts to coerce its argument into a : vector", but here it fails : : is.matrix(as.vector(x1mat)) : [1] TRUE : : Matthias : : > : > The following, which was recently discussions on the rcom-l list, : > is a situation where coercing x1mat to a vector using as.vector : > results in an object that is.vector says is not a vector: : > : > R> x1mat<-matrix(list(1,1.1,1+1i,"a",NA,NaN), 3, 2) : > R> is.vector(as.vector(x1mat)) : > [1] FALSE : > : > __ : > R-devel stat.math.ethz.ch mailing list : > https://stat.ethz.ch/mailman/listinfo/r-devel : : __ : R-devel stat.math.ethz.ch mailing list : https://stat.ethz.ch/mailman/listinfo/r-devel : : __ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
Re: [Rd] is.vector(as.vector(x)) is FALSE
maybe, the point is that is.vector "attempts to coerce its argument into a vector", but here it fails is.matrix(as.vector(x1mat)) [1] TRUE Matthias > > The following, which was recently discussions on the rcom-l list, > is a situation where coercing x1mat to a vector using as.vector > results in an object that is.vector says is not a vector: > > R> x1mat<-matrix(list(1,1.1,1+1i,"a",NA,NaN), 3, 2) > R> is.vector(as.vector(x1mat)) > [1] FALSE > > __ > [EMAIL PROTECTED] mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel __ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
[Rd] is.vector(as.vector(x)) is FALSE
The following, which was recently discussions on the rcom-l list, is a situation where coercing x1mat to a vector using as.vector results in an object that is.vector says is not a vector: R> x1mat<-matrix(list(1,1.1,1+1i,"a",NA,NaN), 3, 2) R> is.vector(as.vector(x1mat)) [1] FALSE __ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
