Displaying 2 results from an estimated 2 matches for "poly2".
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2010 Oct 25
1
calculate area between intersecting polygons
Dear list:
I am trying to calculate the intersection area between two irregular
polygons (see example data below).
set.seed(1234)
theta <- seq(0, 2 * pi, length=(100))
poly1<- cbind(c(0 + 1 * cos(theta) + rnorm(100, sd=0.1)), c(0 + 2 *
sin(theta)))
poly2<- cbind(c(0 + 2 * cos(theta) ), c(-1 + 1.5 * sin(theta)+ rnorm(100,
sd=0.1)))
plot(x, y, type = "n", , xlim=c(-5,5), ylim=c(-5,5))
polygon(poly1)
polygon(poly2)
My data correspond to geographical positions, therefore I cannot generate it
using equations as I did in the examp...
2003 Jun 17
2
Paste and namespace
Hi, my doubt is very simple. I'm sure I've seen someone using something
like this before, but unfortunatelly my searches in the archives were useless.
Well, I have some objects called after a name that has a number attached to
it,
varying. Let's say I have:
> ls
poly1 poly2 poly3 poly4 poly5 poly6 ...
I would like to access these objects using a for(), in which I could do
something like paste("poly",i,sep=''). For i = 4, for instance I get
> paste("poly",4,=sep'')
[1] "poly8"
Which is a string. What command should...