Thanks a lot Uwe Ligges, I've abandoned R for a few time but now I'm working with it, so I've a question about the last problem that you solved: instead to write cv_1994<- idw.cv("X01_1994") cv_1995<- idw.cv("X01_1995") cv_1996<- idw.cv("X01_1996") cv_1997<- idw.cv("X01_1997") ..... cv_2006<- idw.cv("X01_2006") cv_2007<- idw.cv("X01_2007") cv_2008<- idw.cv("X01_2008") can I use a more compact expression???? Thanks
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