[R] maps in R from a list of x y

[Malta]

hello,

I work on map anamporphosis, and I have managed to :
- import and view mif/mid in R
- work on coordinates in R.

But I don't get how I can transform a list of x, y, id in a sp object (or
other) to visualize my transformation without having to go back in mapinfo
(Actually I can see points, but I would like to see polygons)
My data is organised as follow :
x,y,id1,id2
x y are coordinates obviously
id1 is the id of the polygon
id2 is the id of the multipolygon (when an area is made of several polygon)

I have tried to do it manually with a loop to make Polygon, then Polygons,
then ... but it's dramatically slow



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