# Converting magpie objects

`convertGDP` also accepts a magpie object (see the magclass package) for the `gdp` argument.

    library(GDPuc)

    my_gdp <- magclass::new.magpie(
      cells_and_regions = c("USA", "FRA"),
      years = 2010:2014,
      names = "gdp",
      sets = c("iso3c", "year", "data"),
      fill = 100:109
    )
    my_gdp
    #> An object of class "magpie"
    #> , , data = gdp
    #>
    #>      year
    #> iso3c y2010 y2011 y2012 y2013 y2014
    #>   USA   100   102   104   106   108
    #>   FRA   101   103   105   107   109

    convertGDP(
      gdp = my_gdp,
      unit_in = "constant 2005 LCU",
      unit_out = "constant 2017 Int$PPP"
    )
    #> An object of class "magpie"
    #> , , data = gdp
    #>
    #>      year
    #> iso3c    y2010    y2011    y2012    y2013    y2014
    #>   USA 123.2084 125.6726 128.1367 130.6009 133.0651
    #>   FRA 150.4810 153.4608 156.4406 159.4204 162.4002

`convertGDP` does not change or add the “unit” attribute of the magpie object.