[R] gathering denominator under frac

[Bert Gunter]

BTW, for your amusement,

ylab = ~ frac(additive ~ HCO[3]^"-",
                           true ~ HCO[3]^"-" ))

also should work. The reason is (from ?plotmath):

"In most cases other language objects (names and calls, including
formulas) are coerced to expressions and so can also be used."

Cheers,
Bert


On Fri, Feb 2, 2024 at 8:33 AM Bert Gunter <bgunter.4567 using gmail.com> wrote:
>
> ... or if I understand correctly, simply
>
> expression(frac(additive ~ HCO[3]^"-",
>                            true ~ HCO[3]^"-" )))
>
> Cheers,
> Bert
>
> On Fri, Feb 2, 2024 at 3:06 AM Rui Barradas <ruipbarradas using sapo.pt> wrote:
>>
>> Às 10:01 de 02/02/2024, Troels Ring escreveu:
>> > Hi friends - I'm plotting a ratio of bicarbonates i ggplot2 and
>> >
>> > ylab(expression(paste(frac("additive BIC","true BIC")))) worked OK - but
>> > now I have been asked to put the chemistry instead - so I wrote
>> >
>> >   ylab(expression(paste(frac("additive",HCO[3]^"-","true",HCO[3]^"-"))))
>> > - and frac saw that as additive = numerator and HCO3- = denominator and
>> > the rest was ignored-
>> >
>> > So how do I make frac ignore the first ","  and print the fraction as I
>> > want?
>> >
>> >
>> > All best wishes
>> > Troels
>> >
>> > ______________________________________________
>> > 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.
>> Hello,
>>
>> This seems to work. Instead of separating the two numerator strings with
>> a comma, separate them with a tilde. The same goes for the denominator.
>> And there is no need for double quotes around "additive" and "true".
>>
>>
>> library(ggplot2)
>>
>> g <- ggplot(iris, aes(Sepal.Length, Sepal.Width, color = Species)) +
>>    geom_point()
>>
>> g + ylab(expression(paste(frac(
>>    additive~HCO[3]^"-",
>>    true~HCO[3]^"-"
>> ))))
>>
>>
>>
>> Hope this helps,
>>
>> Rui Barradas
>>
>>
>> --
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>>
>> ______________________________________________
>> 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.