From: Prof Brian Ripley <ripley_at_stats.ox.ac.uk>

Date: Wed 31 May 2006 - 00:39:19 EST

Date: Wed 31 May 2006 - 00:39:19 EST

On Tue, 30 May 2006, Robert Lundqvist wrote:

> 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...
*

Well, they end up where you request them. In that particular case I would use axis() to add a label that matched the tick marks, but mtext() is often useful.

> 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...
*

There is the little matter of having access to the S source code and permission to make use of it, as well as knowing how the S graphics device model works (which AFAIK has never been publicly documented but it believed to be somewhat different from R).

The devil is in the details: notice how the y axis on the plot shown is uneven, with a stretch in the middle? Should such things be allowed (I think not)?

-- Brian D. Ripley, ripley@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 ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.htmlReceived on Wed May 31 01:01:22 2006

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