[R] Special characters in cell names

[David Winsemius]

Backticks. NOT apostrophes. 

— David

Sent from my iPhone

> On Jun 23, 2021, at 2:40 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.
>>> 
>> 
> 
>    [[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.