Re: [R] Add text/numbers to x axis?

From: Peter Dalgaard <p.dalgaard_at_biostat.ku.dk>
Date: Tue 30 May 2006 - 23:21:24 EST

Robert Lundqvist <Robert.Lundqvist@ltu.se> writes:

> Is there any simple way to add text to the x axis in R? I have tried to
> add simple characters in R without any greater sucess. As an example of
> what I want to do is the added C in the following "dumb" plot (produced
> with MacAnova using the option "dumb:T"):
>
> ++------+-------+------+-------+------+-------+------+-------++
> 1+ : *+
> | : * * |
> | : * * |
> | : * . |
> 0.8+ : * . +
> | : . |
> | : * . |
> | : * . |
> 0.6+ : . +
> | : * . |
> | * . |
> | : . |
> | * : . |
> 0.4+ : . +
> | * : . |
> | * : . |
> | : . |
> 0.2+ * : . +
> | * : . |
> | * * : . |
> |* * * : . |
> 0++------+-------+------+-------+------+-------+--.---+-------++
> -2 -1.5 -1 -0.5 0 0.5 1 C 1.5 2
>
>
> My attempts to use locator() and text() in R's plot() has not been working
> as good as expected. Never really knows where the added symbols end up...

mtext() is your friend.  

> BTW, anyone who knows how such "dumb" plots could be achieved in R? This
> option is avaliable in S, so a port to R shouldn't be impossible, should
> it? Don't know how to do it myself however...

Presumably you "just" need someone to write a device driver for it. The structure of those is somewhat different from S, so it's not a straightforward port (even if the S code was publically available). As I recall it (fortunately, it was decades ago), some cosmetic issues become tricky due to the high granularity of such line printer plots; things like alignment of strings and continuation of polylines. However if someone wants to read up on Bresenham's line drawing algorithm and all that...

-- 
   O__  ---- Peter Dalgaard             ุster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
 (*) \(*) -- University of Copenhagen   Denmark          Ph:  (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)                  FAX: (+45) 35327907

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Received on Tue May 30 23:36:51 2006

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