[R-sig-Geo] Convert SpatialPointsDataFrame to SpatialPolygons or SpatialPolygonsDataFrame

[Miluji Sb]

I have a SpatialPointsDataFrame with the following attributes. Is it
possible to convert this to a SpatialPolygons or SpatialPolygonsDataFrame?
Thank you!

Sincerely,

Milu

class       : SpatialPointsDataFrame
features    : 21441
extent      : -179.5, 179.5, -89.5, 83.5  (xmin, xmax, ymin, ymax)
coord. ref. : +proj=longlat +a=6367470 +b=6367470 +no_defs
variables   : 7
names       : ID_cell,    lon,   lat, Field4, Field5, Field6, Field7
min values  :    2304,    0.5,   0.5,     NA,     NA,     NA,     NA
max values  :   64800, -179.5, -89.5,     NA,     NA,     NA,     NA

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