Hi, Michael:
I'm sure the example would be clearer AND more interesting if you used
real data AND accompanied it with a description like you gave below. To
help motivate the usage, you could add a few words of interpretation,
e.g., that if you want both z and zz less than 2, x and y must be in the
upper right corner.
Thanks for this.
spencer graves
Michael Prager wrote:
GG
Yes, gladly. It is an idealized example of the following data situation:
There are two control or "independent variables." They are represented
here as x and y, on the horizontal and vertical axes respectively. There
are two different responses or "dependent" variables plotted as different
types of contours. The filled contours show response z. The heavy lines
show response zz.
Thus such a plot displays two different responses from a two-dimensional
range of conditions. As an example, in fishery biology, x might be the
age at which fish are first subject to capture, y might be the fishing
mortality rate (intensity) applied, z might be the resulting yield per
fish, and zz might be the resulting spawning per fish. There is usually
a trade-off between yield and spawning potential, and such a graph (if
done with real data) allows one to look at that trade-off. The OP seemed
to be seeking a way of contouring two responses against two independent
variables, and that's what this graph does.
Is that clearer? Would the graph would be better if I used real data?
MHP
Gabor Grothendieck wrote on 2/12/2006 11:31 AM:
Could you walk us through, in detail, what that graph is showing?
On 2/12/06, Michael Prager <Mike.Prager at noaa.gov> wrote:
Besides the answers you already have, you might look at my "4D" graph
example (with code) on the R Graphics Gallery:
http://addictedtor.free.fr/graphiques/RGraphGallery.php?graph=90
I think it does exactly what you are asking, and therefore it might fit
your needs with only slight code modification.
Mike Prager
Abd Rahman Kassim wrote on 2/12/2006 11:12 PM:
Dear All,
I have a question on overlaying a filled.contour (e.g. on soil
properties data) and contour (by elevation) in one graph. Both have the
same z matrix dimension. I'm able to overlay both graph, but the plots
dimension did not overlap well on the same plots. How can I have both
filled.contour and contour on the same graph? The commands that I have
written are as follows:
filled.contour(0:15,0:10,t(matrix(Total.C,nrow=11,ncol=16)))
contour(0:15,0:10,as.matrix(elev),add=T)
Thanks for anay assistance.
Regards.
Abd Rahman Kassim
Forest Research Institute Malaysia
Kepong 52109
Selangor, MALAYSIA
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