[R] Plot Arrows with Angle and length

Dears, The arrows command uses the start and end coordinates of each vector, but I have the starting coordinates, azimuth, and length. So, There are package that plot this arrows? Example: > x<- c(1,2,4) > y<- c(2,3,5) > Azimuth<- c(45,90,180) > Length<- c(1,0.5,1) Thanks, Julio [[a

[R] 4253H twice implementation

Dear All, Anybody know if *4253H twice filter* is implemented in R? *Description of filter:* Applies a series of running medians of varying window size and a weighted average filter, with re-roughing, to the NDVI time series *Reference*: Velleman, P. (1980). Definition and comparison of robust no

[R] Problem with legend and RasterLayer

Dear, I can't plot legend over a Rasterlayer. My system is MAC OS Lion. See my problem: ### Data > img class : RasterLayer dimensions : 5, 5, 25 (nrow, ncol, ncell) resolution : 0.002245, 0.002245 (x, y) extent : -48.33875, -48.32753, -20.35756, -20.34634 (xmin, xmax, y

[R] problem in tk_choose.files

Dear list, I can't use the choose.files for list the 2,000 files in directory. # list files > names <- (tk_choose.files(default = "", caption = "Select the files ", +multi = TRUE, filters = Filt, +index = 1)) > > > names character(0) # names is empty

[R] Rgdal package - get information

> > Hi, > > I used > GDALinfo("MOD13Q1.A2001049.h13v11.005.2007002215512.250m_16_days_EVI.tif") > and > got the results: > > rows10 > columns 11 > bands 1 > origin.x150701.4 > origin.y7744897 > res.x 250 > res.y 250 > ysign -1 > oblique.x 0 >

[R] GDType information

Hi, I used GDALinfo("MOD13Q1.A2001049.h13v11.005.2007002215512.250m_16_days_EVI.tif") and got the results: rows10 columns 11 bands 1 origin.x150701.4 origin.y7744897 res.x 250 res.y 250 ysign -1 oblique.x 0 oblique.y 0 driver GTiff pro