From: Spencer Graves <spencer.graves_at_pdf.com>

Date: Mon 13 Feb 2006 - 07:40:44 EST

*>
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>

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Mon Feb 13 07:42:33 2006

Date: Mon 13 Feb 2006 - 07:40:44 EST

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@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 >>>> >>>>***************************************** >>>> >>>> >>>>***************************************** >>>> [[alternative HTML version deleted]] >>>> >>>>______________________________________________ >>>>R-help@stat.math.ethz.ch mailing list >>>>https://stat.ethz.ch/mailman/listinfo/r-help >>>>PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html >>>> >>>> >>> >>>-- >>>Michael H. Prager, Ph.D. >>>Population Dynamics Team >>>NOAA Center for Coastal Habitat and Fisheries Research >>>NMFS Southeast Fisheries Science Center >>>Beaufort, North Carolina 28516 USA >>>http://shrimp.ccfhrb.noaa.gov/~mprager/ >>> >>>______________________________________________ >>>R-help@stat.math.ethz.ch mailing list >>>https://stat.ethz.ch/mailman/listinfo/r-help >>>PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html >>> >>>

>

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Mon Feb 13 07:42:33 2006

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