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</o:shapelayout></xml><![endif]--></head><body lang=PT link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='font-family:"Eras Medium ITC","sans-serif";color:#1F497D'>Hello all:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Eras Medium ITC","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Eras Medium ITC","sans-serif";color:#1F497D'>I’m a regular user of R, but my knowledge of C++ is limited. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Eras Medium ITC","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Eras Medium ITC","sans-serif";color:#1F497D'>I need to create functions to generate random landscapes (with two habitat classes) based on area and distance amongst patches. This would take quite a long time in R so I thought it would be better to use Rcpp (which seems a simpler way to integrate R and C++). I need to generate these landscapes for the current time and their evolution in the future (about 1000 to each of these time steps).<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Eras Medium ITC","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Eras Medium ITC","sans-serif";color:#1F497D'>I thought it would be better to generate these “landscapes” as multidimensional arrays but I’m finding it hard to work with C++.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Eras Medium ITC","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Eras Medium ITC","sans-serif";color:#1F497D'>Would it be adequate to use this functions:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Eras Medium ITC","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Eras Medium ITC","sans-serif";color:#1F497D'>rdlandscape <- cxxfunction(signature(x = "numeric"), body = "C++ code", plugin="Rcpp")<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Eras Medium ITC","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Eras Medium ITC","sans-serif";color:#1F497D'>I don’t need to retain these objects after the run just calculate several parameters (as extinction probability) of a species that would be present in these landscapes.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Eras Medium ITC","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Eras Medium ITC","sans-serif";color:#1F497D'>Any ideas?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Eras Medium ITC","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Eras Medium ITC","sans-serif";color:#1F497D'>Best,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Eras Medium ITC","sans-serif";color:#1F497D'>Frederico Mestre<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>