R help - Apr 2001 - ylab/ expression/ superscript to a bracket

Colleagues

  ----------------------------------
  System info:
  R version rw1022 on NT
  ESS v. 5.1.18 using emacs ver. 20.4

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  I have some rather unusual units for acoustic volume backscattering
  integrated over several metres depth and 10 transmits (which happens to
  = 160 m along transect). I need to express these units in a graph label.

  My problem comes in applying a superscripted number to a bracket (see
  the )^{-3} below:

  ylab=expression(paste('mean SV dB [', m^{2},' (160
m',)^{-3},']'))

  This gives an error (due to what is interpreted as an extra bracket).
  However, superscript requires a character to superscript to, so I can
  either use a dot (which is confusing in the label) 

   ylab=expression(paste('mean SV dB [', m^{2},' (160
m)',.^{-3},']'))

  or use another kind of bracket. Unfortunately the label needs two kinds
  of brackets. Also using a brace, }^{-3} doesn't help for obvious
  reasons.

  Any hints? Help will be appreciated.

  Thanks

  Sam

Sam McClatchie, Research scientist (fisheries acoustics))))))))))
NIWA (National Institute of Water & Atmospheric Research Ltd)
PO Box 14 901, Kilbirnie, Wellington, New Zealand
s.mcclatchie at niwa.cri.nz 

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"S.McClatchie" <s.mcclatchie at niwa.cri.nz> writes:
>   My problem comes in applying a superscripted number to a bracket (see
>   the )^{-3} below:
> 
>   ylab=expression(paste('mean SV dB [', m^{2},' (160
m',)^{-3},']'))
> 
>   This gives an error (due to what is interpreted as an extra bracket).
>   However, superscript requires a character to superscript to, so I can
>   either use a dot (which is confusing in the label) 
> 
>    ylab=expression(paste('mean SV dB [', m^{2},' (160
m)',.^{-3},']'))
> 
>   or use another kind of bracket. Unfortunately the label needs two kinds
>   of brackets. Also using a brace, }^{-3} doesn't help for obvious
>   reasons.
> 
>   Any hints? Help will be appreciated.
?plotmath will tell you about phantom() and group()...

I'd go for 

plot(0, ylab=expression('mean SV dB  ' * 
	                group("[", m^{2} * ("160 m")^{-3},
"]")))

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
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