[R] Special characters in cell names

[Bert Gunter]

Try:
ggplot(mydata, aes(x=W, y=`X/Y`)) + geom_violin(trim=FALSE)

Note the use of *backticks*, ``, not single quotes, ' '  . ** They are
different.**

So, yes, your data got read in correctly, presumably because "/" is
considered a character in your locale. It is not in mine. So my suggestion
was indeed irrelevant.

Bert Gunter

"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )


On Wed, Jun 23, 2021 at 2:39 PM Mahmood Naderan <mahmood.nt using gmail.com>
wrote:

> Hi Bert,
> I don't know what does "check.names" do here, but my commands look like
>
>
> > mydata <- read.csv('r.3080..csv', header=T,row.names=1)
>
> > head(mydata)
>                   W      A        X/Y
> P1       M      1.469734 0.004144405
> P2    M     20.584841 0.008010306
> P3         M     53.519800 0.166034888
> P4          M     42.308700 0.051545443
> P5   M     99.236384 0.893037857
> P6            M     94.279504 0.856837525
>
> So when I use
>
> p <- ggplot(mydata, aes(x=W, y='X/Y')) + geom_violin(trim=FALSE)
>
>
> The output is not correct. I don't see values (scale) on the y-axis.
> Anyway, I fixed that with a label.
>
> Regards,
> Mahmood
>
>
>
>
> On Wed, Jun 23, 2021 at 11:16 PM Bert Gunter <bgunter.4567 using gmail.com>
> wrote:
>
>> I found your specification quite vague. What did you mean by a "data
>> file" -- a data frame in R? -- a file in the file system?
>>
>> I may be completely wrong here, but another possibility is that you read
>> your data into an R data.frame via, e.g. read.table() or read.csv(), but
>> failed to specify the check.names = FALSE, argument. This would cause a
>> column named "x/y" in your original table to be given the name "x.y" in R,
>> as "x/y" is not a syntactically valid name. See ?make.names for details.
>>
>> As others have already said, enclosing non-syntactically valid names in
>> back ticks usually works (maybe always works??). So for example:
>>
>> z<-data.frame (`a/b` = 1:5, y = 1:5, check.names = FALSE)
>> plot(y ~ `a/b`, data = z) ## produces desired plot with correct label
>> z  ## yields:
>>   a/b y
>> 1   1 1
>> 2   2 2
>> 3   3 3
>> 4   4 4
>> 5   5 5
>>
>> Of course, ignore if this is all irrelevant.
>>
>> Bert Gunter
>>
>> "The trouble with having an open mind is that people keep coming along
>> and sticking things into it."
>> -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
>>
>>
>> On Wed, Jun 23, 2021 at 1:37 PM Mahmood Naderan <mahmood.nt using gmail.com>
>> wrote:
>>
>>> Unfortunately, using 'X/Y' doesn't work either.
>>> Instead I used labels like below
>>>
>>> P + scale_y_continuous(name="X/Y")
>>>
>>> Thanks for the suggestions.
>>>
>>> Regards,
>>> Mahmood
>>>
>>>
>>>
>>>
>>> On Wed, Jun 23, 2021 at 9:22 PM Eric Berger <ericjberger using gmail.com>
>>> wrote:
>>>
>>> > If no one comes up with a better suggestion:
>>> > a. Change the column name to "Y" so that you get the plot you want
>>> > b. Use axis labels and legend text to show the text that you want. (The
>>> > user never has to know that you changed the column name 😃)
>>> >
>>> > HTH,
>>> > Eric
>>> >
>>> > On Wed, Jun 23, 2021 at 9:58 PM Mahmood Naderan <mahmood.nt using gmail.com>
>>> > wrote:
>>> >
>>> >> Hi
>>> >> I have a column in my data file which is "X/Y". With '/' I want to
>>> >> emphasize that values are the ratio of X over Y.
>>> >> Problem is that in the following command for a violin plot, I am not
>>> able
>>> >> to specify that '/' even with double quotes.
>>> >>
>>> >> p <- ggplot(mydata, aes(x=W, y="X/Y")) + geom_violin(trim=FALSE)
>>> >>
>>> >> However, if I change that column to "Y" and use
>>> >>
>>> >> p <- ggplot(mydata, aes(x=W, y=Y)) + geom_violin(trim=FALSE)
>>> >>
>>> >> Then the plot will be correctly shown.
>>> >> Any ideas for that?
>>> >>
>>> >> Regards,
>>> >> Mahmood
>>> >>
>>> >>         [[alternative HTML version deleted]]
>>> >>
>>> >> ______________________________________________
>>> >> R-help using 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 using 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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