[Rd] write.table confused by rownames/colnames (PR#7941)
Full_Name: Axel Rasche
Version: 2.1.0
OS: Win2000
Submission from: (NULL) (141.14.21.81)
Hi,
write.table does not accept the second statement with
.
I do not see why this should not be possible.
test = matrix(1:4, 2, 2, dimnames = list( c("a","b"), c("c","d") ))
write.table(test, file = "test.txt", sep = "\t", quote = FALSE,
col.names = NA, row.names = FALSE)
write.table(test, file = "test.txt", sep = "\t", quote = FALSE,
col.names = NA)
write.table(test, file = "test.txt", sep = "\t", quote = FALSE,
col.names = TRUE, row.names = FALSE)
write.table(test, file = "test.txt", sep = "\t", quote = FALSE,
col.names = FALSE, row.names = FALSE)
Thanks,
Axel
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Re: [Rd] write.table confused by rownames/colnames (PR#7941)
Hello,
Alright, I did not look at it that way I admit. I built a matrix with
multiple row names (as a data.frame). Confusion started when exporting
this as a spread-sheet.
Now it all works fine.
Thanks and sorry for the false alarm,
Axel
Prof Brian Ripley wrote:
> It seems that you are the one who is confused: the help file says
>
> By default there is no column name for a column of row names. If
> 'col.names = NA' a blank column name is added.
>
> If there are no row names, there is no point in adding a blank column
> name for them. So what did *you* think it would do?
>
> On Wed, 15 Jun 2005 [EMAIL PROTECTED] wrote:
>
>> Full_Name: Axel Rasche
>> Version: 2.1.0
>> OS: Win2000
>> Submission from: (NULL) (141.14.21.81)
>>
>>
>> write.table does not accept the second statement with
>>.
>> I do not see why this should not be possible.
>>
>> test = matrix(1:4, 2, 2, dimnames = list( c("a","b"), c("c","d") ))
>> write.table(test, file = "test.txt", sep = "\t", quote = FALSE,
>> col.names = NA, row.names = FALSE)
>> write.table(test, file = "test.txt", sep = "\t", quote = FALSE,
>> col.names = NA)
>> write.table(test, file = "test.txt", sep = "\t", quote = FALSE,
>> col.names = TRUE, row.names = FALSE)
>> write.table(test, file = "test.txt", sep = "\t", quote = FALSE,
>> col.names = FALSE, row.names = FALSE)
>
>
>
--
***
Dipl. Math. ETH Axel Rasche
Max-Planck-Institute for Molecular Genetics
Department Lehrach (Vertebrate Genomics)
Ihnestrasse 63-73
D-14195 Berlin-Dahlem
GERMANY
Tel. ++49-30-8413-1289
Fax ++49-30-8413-1380
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[Rd] 0/1 vector for indexing leads to funny behaviour (PR#8389)
Full_Name: Axel Rasche
Version: 2.2.0
OS: Linux
Submission from: (NULL) (141.14.21.81)
Dear Debuggers,
This is not a serious problem. Are 0/1 vectors intended to be used as index
vectors? If yes, there is a bug. If not, it leads just to some funny behaviour
rather than an error message.
In the appendix is some simple code to reproduce the problem. A logical vector
as.logic(a) helps by indexing the vector b. The 0/1 vector a just returns the
first value "a". But as many times as there is a 1 in a.
Best regards,
Axel
Appendix:
b = c("a","b","c","d")
a = c(0,1,1,0)
b[as.logical(a)]
b[a]
a = c(1,0,1,0)
b[as.logical(a)]
b[a]
a = c(0,1,1,1)
b[as.logical(a)]
b[a]
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Re: [Rd] 0/1 vector for indexing leads to funny behaviour (PR#8389)
Hi,
OK, no bug. I got stuck into to much indexing. Now I understand this
point definitely better.
Sorry for disturbing you,
Axel
Tony Plate wrote:
> Yes, 0/1 (numeric) are intended to be used as index vectors -- and they
> have the semantics of numeric indices, which is that 0 elements in the
> index are omitted from the result. This can be a very useful mode of
> operation in many situations.
>
> I was going to write "This is described in both the introduction to R,
> and in the documentation for '['", except that I checked before I wrote
> and was surprised to be unable to any discussion of zeros in indexing in
> any of the first three places I looked:
>
> (1) help page for '[' (There is discussion of zero indices here, but
> only in the context of using matrices to index matrices, not in the
> context of ordinary vector indices).
>
> (2) Section 2.7 "Index vectors: selecting and modifying subsets of a
> data set" in "An Introduction to R", which does say this about numeric
> indices:
> 2. A vector of positive integral quantities. In
>this case the values in the index vector must
>lie in the set {1, 2, . . . , length(x)}
> (This seems to commit the sin of not telling the whole truth.)
>
> (3) Section 5.5 "Array Indexing. Subsections of an array" (In "An
> Introduction to R")
>
> Question for others: did I miss something obvious, or is this a
> documentation deficiency that zeros in indices are not discussed in 3 of
> some obvious first places to look?
>
> If indeed this is a documentation deficiency, I'm happy to contribute
> documentation patch, but I await other opinions before spending any time
> on that.
>
> -- Tony Plate
>
> [EMAIL PROTECTED] wrote:
>
>> Full_Name: Axel Rasche
>> Version: 2.2.0
>> OS: Linux
>> Submission from: (NULL) (141.14.21.81)
>>
>>
>> Dear Debuggers,
>>
>> This is not a serious problem. Are 0/1 vectors intended to be used as
>> index
>> vectors? If yes, there is a bug. If not, it leads just to some funny
>> behaviour
>> rather than an error message.
>>
>> In the appendix is some simple code to reproduce the problem. A
>> logical vector
>> as.logic(a) helps by indexing the vector b. The 0/1 vector a just
>> returns the
>> first value "a". But as many times as there is a 1 in a.
>>
>> Best regards,
>> Axel
>>
>>
>> Appendix:
>>
>> b = c("a","b","c","d")
>> a = c(0,1,1,0)
>> b[as.logical(a)]
>> b[a]
>> a = c(1,0,1,0)
>> b[as.logical(a)]
>> b[a]
>> a = c(0,1,1,1)
>> b[as.logical(a)]
>> b[a]
>>
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>> R-devel@r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-devel
>>
>
--
***
Dipl. Math. ETH Axel Rasche
Max-Planck-Institute for Molecular Genetics
Department Lehrach (Vertebrate Genomics)
Ihnestrasse 63-73
D-14195 Berlin-Dahlem
GERMANY
Tel. ++49-30-8413-1289
Fax ++49-30-8413-1380
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