[R] Special characters in cell names

[David Winsemius]

On my keyboard the key is share with the tilde symbol and is up on the left hand corner. 

Sent from my iPhone

> On Jun 23, 2021, at 2:45 PM, David Winsemius <dwinsemius using comcast.net> wrote:
> 
> 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.