readAsciiGrid (maptools) 2
On Tue, 13 Nov 2007, Ingo Holz wrote:
Hi again, OK, it is not a problem of readAsciiGrid (maptools)! However: x <- 3539000.5 : 3540000.5 ## OK, readAsciiGrid adds .5 to the coordinates length(x) x[1:10] min(x) ## OK, this is the rounded value summary(x) ## I still do not understand this summary(1:1001) I get the following results:
x <- 3539000.5 : 3540000.5 ## OK, readAsciiGrid adds .5 to the coordinates length(x)
[1] 1001
x[1:10]
[1] 3539001 3539002 3539003 3539004 3539005 3539006 3539007 3539008 3539009 3539010
min(x) ## OK, this is the rounded value
[1] 3539001
summary(x) ## I still do not understand this
Min. 1st Qu. Median Mean 3rd Qu. Max. 3539000 3539000 3540000 3540000 3540000 3540000
x <- seq(3539000.5, 3540000.5, 1)
length(x) [1] 1001
options(digits=16) summary(x)
Min. 1st Qu. Median Mean 3rd Qu. Max. 3539000.5 3539250.5 3539500.5 3539500.5 3539750.5 3540000.5 OK? Roger
summary(1:1001)
Min. 1st Qu. Median Mean 3rd Qu. Max.
1 251 501 501 751 1001
Ingo
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Roger Bivand Economic Geography Section, Department of Economics, Norwegian School of Economics and Business Administration, Helleveien 30, N-5045 Bergen, Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43 e-mail: Roger.Bivand at nhh.no