[R] Positioning text in top left corner of plot

[Daniel Brewer]

Simple question how can you position text in the top left hand corner of
a plot?  I am plotting multiple plots using par(mfrow=c(2,3)) and all I
want to do is label these plots a), b), c) etc.  I have been fiddling
around with both text and mtext but without much luck.  text is fine but
 each plot has a different scale on the axis and so this makes it
problematic.  What is the best way to do this?

Many thanks

Dan
-- 
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Daniel Brewer, Ph.D.

Institute of Cancer Research
Email: daniel.brewer at icr.ac.uk
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The Institute of Cancer Research: Royal Cancer Hospital, a charitable Company Limited by Guarantee, Registered in England under Company No. 534147 with its Registered Office at 123 Old Brompton Road, London SW7 3RP.

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