Hi,
I am looking for a way to find the lower envelope of points on a plot,
preferably specifying what percentage of points should be allowed to lie
outside the envelope. There must be a straightforward way to do this,
but I do not seem to be able to find it. I would greatly appreciate any
On Jun 30, 2010, at 2:05 PM, Asha Sharma wrote:
Hi,
I am looking for a way to find the lower envelope of points on a
plot, preferably specifying what percentage of points should be
allowed to lie outside the envelope. There must be a straightforward
way to do this, but I do not seem to
Hi,
one possibility would be to calculate the convex hull using chull(). I
believe that the hull points are returned by chull() in a clockwise
order (?), so the points between the rightmost and the leftmost point in
the chull() result are the lower half of the convex hull. Remove these
Hi,
To be honest, what you mean by a (linear) lower envelope becomes less
and less clear to me. Take any cloud of 2-d points. The convex hull
consists of a number of these points - or alternatively, of a number of
line segments between successive ones of these points. Thus, every one
of
Hi,
Thanks to both of you for taking the time to answer my question. I was
maybe not very clear in the way I framed my question. By plot, I meant
an x-y plot with a cloud of points which should have a linear lower
envelope. Is there a way to both plot as well as get the parameters of
the
On Jun 30, 2010, at 4:02 PM, Asha Sharma wrote:
Hi,
Thanks to both of you for taking the time to answer my question. I
was maybe not very clear in the way I framed my question. By plot, I
meant an x-y plot with a cloud of points which should have a linear
lower envelope. Is there a way
I think this has reached the point where it is absolutely necessary
for Asha Sharma to state *exactly* what is meant by a linear lower
envelope of a set of points. There are too many possibilities for
the problem as stated so far. For instance (possibilities which have
not been considered so far):
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