R : convert a spatial polygon objet to spatial polygon data frame

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My goal is to modify an existing shapefile by merging certain polygons.

After importing the shapefile and using the UnionSpatialPolygons command, I get the polygon outline that I want.

However, this is now a SpatialPolygons object and not a SpatialPolygonsDataFrame, so I'm unable to export it to a shapefile using writeOGR.

How can I get around this problem?

Thanks in advance,

John



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