[R] How can I use a script "l" (LaTeX \ell) in mathematical annotation of plots?

[Eik Vettorazzi]

this works for me:

plot(1,main="\u2113")

cheers

Am 24.10.2013 01:39, schrieb Byron Dom:
> 
> 
> Original post: On 13/10/2013 18:53, Byron Dom wrote:
> 
>>> Due to convention a script "l" - $$\ell$$ (LaTeX \ell) is used to 
>>> represent a certain quantity in something I'm working on. I'm 
>>> unable to figure out how to use it in R. It's not included in the 
>>> list on ?plotmath.
>>>
>>> Can anyone tell me how to use it?  Its unicode is U+2113. This 
>>> page has a list of various encodings of it: 
>>>
>  http://www.fileformat.info/info/unicode/char/2113/encoding.htm.  
>>> Is there a way to include it by using one of these encodings somehow?
> 
> -------------------------------------------------
> 
> On 13/10/2013 22:06 Prof Brian Ripley responded:
> 
>> What do you want to do with it?  plotmath is about plotting, but you
>> have not otherwise mentioned that, let alone the device on which you 
>> want to plot.
>>
>> Read the help for plotmath: on some plot devices, just use "\u2113".  It 
>> is not AFAICS in the Adobe symbol encoding.
>>
>> -- 
>> Brian D. Ripley,                  ripley at stats.ox.ac.uk
>> Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
>> University of Oxford,             Tel: 
>  +44 1865 272861 (self)
>> 1 South Parks Road,                     +44 1865 272866 (PA)
>> Oxford OX1 3TG, UK                Fax:  +44 1865 272595
> 
> -------------------------------------------------
> 
> My response:
> 
> Thanks I worked out how to do it based on your mention of "u2113".
> See below.
> 
> I'm sorry if my information wasn't complete enough. I assumed that 
> what I said, combined with the subject ("How can I use a script "l" 
> (LaTeX \ell) in
>  mathematical annotation of plots?") would have been 
> enough.
> 
> I just wanted to be able to do this on the default device, which 
> displays plots within the R session window. I have a simple path 
> to go from there to .png form, which I include in LaTeX documents
> and for other purposes. I am using R version 3.0.1 in Windows 7, 
> for which I believe the default plot device is "windows".
> 
> An example of the kind of thing I wanted to do is to include 
> "ylab = expression(hat(gamma))" (which is equivalent to the LaTex 
> "\hat{\gamma}}") among the base-graphics plot() arguments. That 
> works. In LaTeX a script "l" is produced with "\ell", but 
> something like "ylab = expression(ell)" doesn't work in R. 
> I wanted to be able to do the equivalent of that, but to obtain "ℓ".
> 
> Here are a couple of examples using it that worked:
>   > plot(1:10,xlab="\u2113")
>   >
>  plot(1:10,xlab="\u2113(\u2113 + 1)")
> The only (slight) problem with this is the minor aesthetic issue 
> 
> that the "ℓ" one gets this way is in an obviously different font 
> 
> from what one gets using the LaTeX "\lambda" command/symbol.
> 
> Strangely, earlier, when I tried 
>   > plot(1:10,xlab=expression(symbol("\u2113")))
> it did the same thing as 
>   > plot(1:10,xlab=expression(lambda))
> So I got a lower-case greek lambda - "λ", rather than "ℓ"
> (script "l").
> 
> When I used the unicode representation for lowercase 
> lambda - "λ" - as follows
>   >
>  plot(1:10,xlab=expression(symbol("\u03bb")))
> I got this for an x-axis label: "<Y+03BB>". On the other hand,
> the following did work
>   > plot(1:10,xlab="\u03bb"), 
> giving me an x-axis label of lambda - "λ".
> 	[[alternative HTML version deleted]]
> 
> 
> 
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> 

-- 
Eik Vettorazzi

Department of Medical Biometry and Epidemiology
University Medical Center Hamburg-Eppendorf

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