search for: rectilinear

Hi everyone I have a matrix (let's say that it contains the values of elevation) and want to plot its values on a map using a function such as image.plot or filled.contour. The problem is that my grid is not rectilinear, it is bended. Here is an example lon<-matrix(0,20,25) lat<-matrix(0,20,25) elev<-matrix(0,20,25) for (i in 1:20) { for (j in 1:25) { lat[i,j]<-i+((j-12.5)^2)/100 lon[i,j]<-j+((i-10)^2)/100 elev[i,j]<-i+j } } All 3 matrices have dimensions 20x25. How can I plot elev va...

...pe} to calculate my minimum spanning tree. The nodes are telecoms sites from all over Australia. My goal is to determine the minimum cost of linking them via cabling, and I'm starting by calculating the distance "as the crow flies", but will probably eventually need to calculate the rectilinear distances also. I am a very newbie user of R, but have had experience with other stats/programming software such as SAS, however no longer have access to SAS so I've turned to R. I also have tried using MapInfo with the data exported from R, but have found that not so intuitive to learn on the...

...ack to swrast if source is on the GPU sna: Disable dangerous assertions that depend upon external state sna: Stage retirement through the flushing list sna/traps: Translate the extents for the rasterization threads sna/traps: Allow inplace compositing for non-GPU buffers and rectilinear traps sna/traps: Thread the fallback rectilinear compositor sna: After removing the bo from a batch, check whether it is still busy sna: Remember to move scanouts to the scanout cache after retiring sna: Pass width/height to composite for rotated displays sna: Remove s...