[R] problems when merging two data sets

Dear All, I would like to merge two data sets however I am doing something wrong... 1 data set contains 2 columns of 'species occurrence'(1 column) in Germany and 'species names' (2 column). and the second one names of 'Red list species'(1 column) and 'species status' (2 column). so I would like

[R] Help with Centroids

Dear All, I am pretty new to R and would appreciate a help how to calculate centroids from the latitude and longitude of existing cells (e.g. to get centroid for a new cell I would need to combine latitude and 9161,9162,9163,9164 to 9160 or 10152, 10154 to 10150 etc.) Please see attached ta