R reprojecting map to lat/long -

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I used the mapproj package to change the late / long set of map projection (in this example in lagrend). 

  cord & lt; -data.frame (x, y) Lagrange and lieutenant-mproject (chord $ x, chord US $, projection = "lagrej") # some # clustering #here #here are cluster centers, but in the form of loggerase projection   
 How to do it in R? I have read the package documentation and I do not believe the author has planned to set up a plot set. Intends to use beyond.  
 The 'standard' way to work with geospatial data in R is through the set of objects  sp  is the way to change the SP objects  spTransform < / Em> both objects and methods can be found in the  sp  package. If you are not familiar with GIS and R, then there are many tutorials available, it is believed that this can be a fast learning phase.  
 An example of changing the 'Long Late' data for other estimates is detailed in:

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