[R] using identify() together with plot () and pixmap()

[Christoph Lehmann]

Dear R users
I have a two-dimensional array, whose values I want to plot, using the
pixmapGrey class. Plotting works fine, and now I would like to be able
to identify some of the points in the plot using identify(). But I get
the following message while pressing the left mouse button:

> plot(pixmapGrey(fmri.vtc[,,slice,volume]))
> identify(fmri.vtc[,,slice,volume])
warning: no point with 0.25 inches


pressing the right mouse button I get:
numeric(0)

what is the problem  here and how can I solve it?

many thanks for your help

Cheers! 

Christoph


-- 
Christoph Lehmann <christoph.lehmann at gmx.ch>