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Hello I am trying to read a large number of WinZip files from inside R (v 1.7.1, options()$unzip = internal). I have unsuccessfully tried to unpack the files and write to an external directory so that I could read the text files using zip.unpack. Reading some of the archives suggests that this is for .ZIP format files only. I have also unsuccessfully tried to use gzfile to open a connection and

Hello All I am currently looking at spatial data - Chorophyll A concentration in sea water over a wide geographic area. These data are used to determine the location of ocean fronts and hence where tuna are located. A front is identified by a steep gradient in the change in chloroA concentration. I have been looking at these data qualitatively using persp, contour, and image but would like to