From: Lars Claussen <LarsVegas_at_nikocity.de>

Date: Thu 02 Jun 2005 - 18:56:13 EST

43,3 51,5

44,3 51,5

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 Thu Jun 02 19:04:58 2005

Date: Thu 02 Jun 2005 - 18:56:13 EST

Hello R-World,

i am trying to calculate data for a DEM (Digital Elavation Model) which i also want to plot in R. i have the coordinates for the lower left corner which look something like this:

x<-42,2

y<-50,5

besides i have the cellsize of the grid, which is:

z<-1,1

what i do is to calculate the corrdinates of the cells to the right and top,
what i can do by specifying the number of rows and columns. these are
j<-1:805 (columns)

i<-1:616 (rows)

well, to calculate them seperatly is easy:

r<-x+(i-1)*z

h<-y+(j-1)*z

but i can't get it straight how to create a data frame with two rows, one for the x- the other for the y-coordinate. The problem is, that lots of values have to be repeated as every first row x-coordinate has the same y-coordinate and so on.

finally it should look like this:

x y

42,2 50,5 43,3 50,5 44,4 50,5 45,5 50,5

. .. .

42,2 51,5

43,3 51,5

44,3 51,5

any suggestion? thanks in advance, Lars Claussen

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 Thu Jun 02 19:04:58 2005

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