[R] isotope superscripts ggplot2

[Brian Diggs]

On 9/30/2011 8:31 AM, Durant, James T. (ATSDR/DTEM/PRMSB) wrote:
> Happy Friday fellow R users.
>
> I need some help - I am trying to make a graph using ggplot 2 of some lead isotope ratios. Normally, the isotope mass number appears as a  superscript before the chemical symbol. However, I cannot figure out how to do this ggplot2's axis labels. The closest I have come is using "." In front of the numbers I am superscripting e.g:
>
>
> ggplot(.... +xlab(expression(.^207*"Pb/"*.^206*"Pb"))+ylab(expression(.^208*"Pb/"*.^206*"Pb")
>
> I have searched for this and have not had any luck so far... any suggestions?

You can replace the . with phantom("")  This will give the ^ something 
to be an exponent of (namely, a non-printed blank).

> VR
>
> Jim
>
> James T. Durant, MSPH, CIH
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> DIvision of Toxicology and Environmental Medicine
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>
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-- 
Brian S. Diggs, PhD
Senior Research Associate, Department of Surgery
Oregon Health & Science University