search for: tropospheric

Dear R users: I have got a simple question that has been bothering me for a while. Given a certain character vector, I would like to get in a separate vector a fragment of text, in this case the 3rd and 4th letters of each element. So, if: v<- c(“stratosphere”, “mesosphere”, “troposphere”) I want to obtain a different vector like this: c(“ra”, “so”, “op”) Thanks in advance

Hi everybody: Could anybody help how I solve the next problem?. I'm doing interpolation maps of tropospheric ozone of my region, and after create it using IDW, and kriging methods, I want from shapefiles (*.shx, *.shp, *.dbf, *.sbx & *.sbn ) create contour over the interpolation maps. Could anybody tell me how do it?. Thanks in advance. ###################################### Antonio Viudez Mora Dep...