Slope of surface
If I recall my computer graphics (decades ago at Utah), doesn't the cross product enter in here? I'm hoping someone with more recent experience will have fewer cobwebs overlaying the knowledge here. Clint
On Tue, 19 Oct 2004, Uwe Ligges wrote:
Laura Quinn wrote:
Hi, Is there a neat way of working out the slope of a flat surface in R? Given (x,y,z) co-ordinates of the four corners of a square,
three should be sufficient
> s there a function which will allow me to calculate the "mean" slope of the surface in a given direction?
Along the axis, one way without any thinking is to apply a regression with e=0, the neater way is to calculate the true result simply. Just insert one formula into the other ... Uwe Ligges
Thanks in advance.. Laura Laura Quinn Institute of Atmospheric Science School of Earth and Environment University of Leeds Leeds LS2 9JT tel: +44 113 343 1596 fax: +44 113 343 6716 mail: laura at env.leeds.ac.uk
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Clint Bowman INTERNET: clint at ecy.wa.gov Air Quality Modeler INTERNET: clint at math.utah.edu Department of Ecology VOICE: (360) 407-6815 PO Box 47600 FAX: (360) 407-7534 Olympia, WA 98504-7600