[R] reading files with name columns and row columns

[Bogdan Tanasa]

that is great, thank you Bill for time and help ;) !

On Wed, Sep 2, 2015 at 4:36 PM, William Dunlap <wdunlap at tibco.com> wrote:

>   y <- as.matrix(read.table("FILE_NAME",header=T,row.names=1))
>   colnames(y) <- gsub("X","", colnames(y))
>
> Use read.table's check.names=FALSE argument so it won't mangle
> the column names instead of trying to demangle them with gsub()
> afterwards.
>
> E.g.,
>   txt <- "   50%  100%\nA   5     8\nB  13    14\n"
>   cat(txt)
>   #   50%  100%
>   #A   5     8
>   #B  13    14
>   read.table(text=txt, head=TRUE, row.names=1)
>   #  X50. X100.
>   #A    5     8
>   #B   13    14
>   read.table(text=txt, head=TRUE, row.names=1, check.names=FALSE)
>   #  50% 100%
>   #A   5    8
>   #B  13   14
>
>
> Bill Dunlap
> TIBCO Software
> wdunlap tibco.com
>
> On Wed, Sep 2, 2015 at 4:08 PM, Bogdan Tanasa <tanasa at gmail.com> wrote:
>
>> Thanks, Bert ! I solved the situation in the meanwhile, by using :
>>
>> y <- as.matrix(read.table("FILE_NAME",header=T,row.names=1))
>>
>> colnames(y) <- gsub("X","", colnames(y))
>>
>>
>> On Wed, Sep 2, 2015 at 3:59 PM, Bert Gunter <bgunter.4567 at gmail.com>
>> wrote:
>>
>> > Please read the Help file carefully before posting:
>> >
>> > "read.table is not the right tool for reading large matrices,
>> > especially those with many columns: it is designed to read data frames
>> > which may have columns of very different classes. Use scan instead for
>> > matrices."
>> >
>> > But the answer to your question can be found in
>> >
>> > ?make.names
>> >
>> > for what constitutes a syntactically valid name in R.
>> >
>> >
>> > Cheers,
>> > Bert
>> >
>> > Bert Gunter
>> >
>> > "Data is not information. Information is not knowledge. And knowledge
>> > is certainly not wisdom."
>> >    -- Clifford Stoll
>> >
>> >
>> > On Wed, Sep 2, 2015 at 3:11 PM, Bogdan Tanasa <tanasa at gmail.com> wrote:
>> > > Dear all,
>> > >
>> > > would appreciate a piece of help with a simple question: I am reading
>> in
>> > R
>> > > a file that is formatted as a matrix (an example is shown below,
>> although
>> > > it is more complex, a matrix of 1000 * 1000 ):
>> > >
>> > > the names of the columns are 0, 10000, 40000, 80000, etc
>> > > the names of the rows are 0, 10000, 40000, 80000, etc
>> > >
>> > >            0 200000 400000
>> > > 0          0       0       0
>> > > 200000  0       0       0
>> > > 400000  0       0       0
>> > >
>> > > shall I use the command :
>> > >
>> > > y <- read.table("file",row.names=1, header=T)
>> > >
>> > > the results is :
>> > >
>> > >> y[1:3,1:3]
>> > >        X0 X200000 X400000
>> > > 0       0       0       0
>> > > 200000  0       0       0
>> > > 400000  0       0       0
>> > >
>> > > The question is : why R adds an X to the names of the columns eg X0,
>> > > X20000, X40000, when it shall be only 0, 20000, 40000 ? thanks !
>> > >
>> > > -- bogdan
>> > >
>> > >         [[alternative HTML version deleted]]
>> > >
>> > > ______________________________________________
>> > > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> > > 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.
>> >
>>
>>         [[alternative HTML version deleted]]
>>
>> ______________________________________________
>> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> 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.
>>
>
>

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