[R] mask and reverse the selection

[Celine]

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,

Céline


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