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Hi I need some help with the function mask I have a polygon and I want to extract data for all the world except for the polygon I write this code but it doesn't work, do you have any idea of the problem ? how can I do that ? worldmask=mask(invHS,hotspot,inverse=TRUE) worldmask=mask(invHS,hotspot,reverse=TRUE) Thanks a lot for your help, C?line -- View this message in context: http://r.789695.n4.nabble.com/mask-and-reverse-the-selection-tp4633307.html Sent from the R help mailing list archive at Nabble.com.