reading data

Hello all, I have 30 tiff images in the same folder. The name of files are btv_2000097, btv_2000105 ....until btv_2000297. I can read them one by one in R, and then stack all individual layers into a raster object with 30 layers. I have 15 year images. Totally more than 300 images...

4. The following table lists 3 personnel records of a company. Staff ID Birthday Monthly Salary A123 4 March 1989 8,600 A037 23 June 1957 21,450 M015 19 September 1976 17,500 Staff id number has the format...