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    Boa noite!<br>
    <br>
    <br>
    Estou usando a rotina abaixo para construir uma dummy para as
    fronteiras dos estados brasileiros. Porém, quando tendo rodar o R
    reporta o seguinte erro:<br>
    <br>
    Erro: estouro da pilha de contexto na linha 18<br>
    <br>
    <br>
    O que devo fazer?<br>
    <br>
    <br>
    mydata$contiguity<-ifelse((origin=="ac") &
    (destination=="am"),1,<br>
    ifelse((origin=="am") &
    (destination=="ro"),1,ifelse((origin=="am") &
    (destination=="rr"),1,ifelse((origin=="am") &
    (destination=="pa"),1,ifelse((origin=="am") &
    (destination=="mt"),1,<br>
    ifelse((origin=="ro") &
    (destination=="mt"),1,ifelse((origin=="ro") &
    (destination=="am"),1,<br>
    ifelse((origin=="rr") &
    (destination=="am"),1,ifelse((origin=="rr") &
    (destination=="pa"),1,<br>
    ifelse((origin=="pa") &
    (destination=="mt"),1,ifelse((origin=="pa") &
    (destination=="am"),1,ifelse((origin=="pa") &
    (destination=="am"),1,ifelse((origin=="pa") &
    (destination=="rr"),1,<br>
    ifelse((origin=="pa") &
    (destination=="ap"),1,ifelse((origin=="pa") &
    (destination=="ma"),1,ifelse((origin=="pa") &
    (destination=="to"),1,ifelse((origin=="pa") &
    (destination=="mt"),1,<br>
    ifelse((origin=="ap") & (destination=="pa"),1,<br>
    ifelse((origin=="ma") &
    (destination=="pa"),1,ifelse((origin=="ma") &
    (destination=="to"),1,ifelse((origin=="ma") &
    (destination=="pi"),1,<br>
    ifelse((origin=="pi") &
    (destination=="ma"),1,ifelse((origin=="pi") &
    (destination=="to"),1,ifelse((origin=="pi") &
    (destination=="pe"),1,ifelse((origin=="pi") &
    (destination=="ce"),1,<br>
    ifelse((origin=="ce") &
    (destination=="pi"),1,ifelse((origin=="ce") &
    (destination=="pe"),1,ifelse((origin=="ce") &
    (destination=="pb"),1,ifelse((origin=="ce") &
    (destination=="rn"),1,<br>
    ifelse((origin=="rn") &
    (destination=="ce"),1,ifelse((origin=="rn") &
    (destination=="pb"),1,<br>
    ifelse((origin=="pb") &
    (destination=="rn"),1,ifelse((origin=="pb") &
    (destination=="ce"),1,ifelse((origin=="pb") &
    (destination=="pe"),1,<br>
    ifelse((origin=="pe") &
    (destination=="pb"),1,ifelse((origin=="pe") &
    (destination=="ce"),1,ifelse((origin=="pe") &
    (destination=="pi"),1,ifelse((origin=="pe") &
    (destination=="ba"),1,<br>
    ifelse((origin=="pe") & (destination=="al"),1,<br>
    ifelse((origin=="al") &
    (destination=="pe"),1,ifelse((origin=="al") &
    (destination=="ba"),1,ifelse((origin=="al") &
    (destination=="se"),1,<br>
    ifelse((origin=="se") &
    (destination=="al"),1,ifelse((origin=="se") &
    (destination=="ba"),1,<br>
    ifelse((origin=="ba") &
    (destination=="se"),1,ifelse((origin=="ba") &
    (destination=="al"),1,ifelse((origin=="ba") &
    (destination=="pe"),1,ifelse((origin=="ba") &
    (destination=="pi"),1,<br>
    ifelse((origin=="ba") &
    (destination=="to"),1,ifelse((origin=="ba") &
    (destination=="go"),1,ifelse((origin=="ba") &
    (destination=="mg"),1,ifelse((origin=="ba") &
    (destination=="es"),1,<br>
    ifelse((origin=="to") &
    (destination=="pa"),1,ifelse((origin=="to") &
    (destination=="mt"),1,ifelse((origin=="to") &
    (destination=="go"),1,ifelse((origin=="to") &
    (destination=="ba"),1,<br>
    ifelse((origin=="to") &
    (destination=="pi"),1,ifelse((origin=="to") &
    (destination=="ma"),1,<br>
    ifelse((origin=="mt") &
    (destination=="ro"),1,ifelse((origin=="mt") &
    (destination=="am"),1,ifelse((origin=="mt") &
    (destination=="pa"),1,ifelse((origin=="mt") &
    (destination=="to"),1,<br>
    ifelse((origin=="mt") &
    (destination=="go"),1,ifelse((origin=="mt") &
    (destination=="ms"),1,<br>
    ifelse((origin=="ms") &
    (destination=="mt"),1,ifelse((origin=="ms") &
    (destination=="go"),1,ifelse((origin=="ms") &
    (destination=="mg"),1,ifelse((origin=="ms") &
    (destination=="sp"),1,<br>
    ifelse((origin=="ms") & (destination=="pr"),1,<br>
    ifelse((origin=="go") &
    (destination=="mg"),1,ifelse((origin=="go") &
    (destination=="ba"),1,ifelse((origin=="go") &
    (destination=="to"),1,ifelse((origin=="go") &
    (destination=="mt"),1,<br>
    ifelse((origin=="go") &
    (destination=="ms"),1,ifelse((origin=="go") &
    (destination=="df"),1,<br>
    ifelse((origin=="mg") &
    (destination=="sp"),1,ifelse((origin=="mg") &
    (destination=="rj"),1,ifelse((origin=="mg") &
    (destination=="es"),1,ifelse((origin=="mg") &
    (destination=="ba"),1,<br>
    ifelse((origin=="mg") &
    (destination=="go"),1,ifelse((origin=="mg") &
    (destination=="ms"),1,<br>
    ifelse((origin=="sp") &
    (destination=="rj"),1,ifelse((origin=="sp") &
    (destination=="mg"),1,ifelse((origin=="sp") &
    (destination=="ms"),1,ifelse((origin=="sp") &
    (destination=="pr"),1,<br>
    ifelse((origin=="rj") &
    (destination=="mg"),1,ifelse((origin=="rj") &
    (destination=="mg"),1,ifelse((origin=="rj") &
    (destination=="es"),1,<br>
    ifelse((origin=="es") &
    (destination=="ba"),1,ifelse((origin=="es") &
    (destination=="mg"),1,ifelse((origin=="es") &
    (destination=="rj"),1,<br>
    ifelse((origin=="pr") &
    (destination=="sp"),1,ifelse((origin=="pr") &
    (destintaion=="sc"),1,ifelse((origin=="pr") &
    (destination=="ms"),1,<br>
    ifelse((origin=="sc") &
    (destination=="pr"),1,ifelse((origin=="sc") &
    (destination=="rs"),1,<br>
    ifelse((origin=="rs") & (destination=="sc"),1,<br>
    ifelse((origin=="df") &
(destination=="go"),1,0))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))))<br>
    <br>
    <br>
    <br>
    <div class="moz-signature">-- <br>
      <font size="1"><b>Alexandre Rodrigues Loures</b><br>
      </font></div>
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