I have been trying, unsuccessfully, to use identify() to (simply)
return a list of
the indices of points clicked on and overplot (with say a solid dot)
each clicked-on
point so that I can see where I've been. I.e. I don't want to see
the indices printed
on the screen; I just want the points I've already selected to be
highlighted.
I tried
ind <- identify(x,y,labels=rep("\021",length(x)),offset=0)
Two problems:
(1) Instead of getting a solid dot --- which I thought I should get
from "\021", I got a
small rectangle outlined in dotted lines. (Which I would've
thought I'd get from
"\177".)
I seem to get the dotted rectangle no matter what 3 digit string I
use in "\xxx".
(2) Despite setting offset=0 the superimposed symbol is not actually
superimposed,
but is jittered off the location of the existing point by a small
amount.
Another minor annoyance is having to use rep("\021",length(x)) rather
than simply
"\021". I.e. the vector supplied for labels does not get
``recycled'' the way col and
pch etc. are recycled.
Is there any way of resolving these difficulties?
cheers,
Rolf Turner
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