On 22/10/2009 2:57 PM, (Ted Harding) wrote:
A follow-up to my previous query.
Say one of the results returned by contourLines() is
C.W <- contourLines(....)
Then C.W is a list of (in this case 28) lists,
each of which is a list with components $level (a single number),
$x (the x coords of the points on a contour at that level) and
$y (the y coords).
I can of course get these individually with, for the 5th one for
instance,
C.W[[5]]$level
C.W[[5]]$x
C.W[[5]]$y
But I can't see how to obtain, in one line and without running
a nasty loop, to get all the levels at once!
In other words, I'm looking for an expression which will return
the vector
c(C.W[[1]]$level,C.W[[2]]$level,...,C.W[[28]]$level)
sapply(C.W., function(x) x$level)
should do it. (It will contain repeats if your contours have gaps in
them; unique() can remove those.)
Duncan Murdoch
(This is probably something I should already have learned from
the documentation, but I think I may have been asleep during
that class ... ).
With thanks,
Ted.
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E-Mail: (Ted Harding) <ted.hard...@manchester.ac.uk>
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Date: 22-Oct-09 Time: 19:57:09
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