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    Muito obrigado Éder!!!!<br>
    <br>
           Era exatamente a função que eu procurava, funcionou
    perfeitamente,<br>
    <br>
    Abraços,<br>
    <pre class="moz-signature" cols="72">-- 
======================================================================
Alexandre dos Santos
Proteção Florestal 
IFMT - Instituto Federal de Educação, Ciência e Tecnologia de Mato Grosso
Campus Cáceres
Caixa Postal 244
Avenida dos Ramires, s/n
Bairro: Distrito Industrial 
Cáceres - MT                      CEP: 78.200-000
Fone: (+55) 65 8132-8112 (TIM)   (+55) 65 9686-6970 (VIVO)
<a class="moz-txt-link-abbreviated" href="mailto:e-mails:alexandresantosbr@yahoo.com.br">e-mails:alexandresantosbr@yahoo.com.br</a> 
        <a class="moz-txt-link-abbreviated" href="mailto:alexandre.santos@cas.ifmt.edu.br">alexandre.santos@cas.ifmt.edu.br</a> 
Lattes: <a class="moz-txt-link-freetext" href="http://lattes.cnpq.br/1360403201088680">http://lattes.cnpq.br/1360403201088680</a>
OrcID: orcid.org/0000-0001-8232-6722 
Researchgate: <a class="moz-txt-link-freetext" href="https://www.researchgate.net/profile/Alexandre_Santos10">https://www.researchgate.net/profile/Alexandre_Santos10</a>                       
LinkedIn: <a class="moz-txt-link-freetext" href="https://br.linkedin.com/in/alexandre-dos-santos-87961635">https://br.linkedin.com/in/alexandre-dos-santos-87961635</a>
======================================================================
</pre>
    <div class="moz-cite-prefix">Em 09/03/2016 17:39, Éder Comunello
      escreveu:<br>
    </div>
    <blockquote
cite="mid:CABmC8gkVd9cycjGrbSibCLKxNfdRztF1qUiiQ=NPON5xaWRTUQ@mail.gmail.com"
      type="cite">
      <div dir="ltr">
        <div class="gmail_default"
          style="font-family:verdana,sans-serif">Alexandre, boa tarde!</div>
        <div class="gmail_default"
          style="font-family:verdana,sans-serif"><br>
        </div>
        <div class="gmail_default"
          style="font-family:verdana,sans-serif">Não sei se entendi
          direito, mas fiz uma tentativa. Se a ideia servir dá pra
          colocar na forma de uma função.</div>
        <div class="gmail_default"
          style="font-family:verdana,sans-serif"><br>
        </div>
        <div class="gmail_default"
          style="font-family:verdana,sans-serif"><br>
        </div>
        <div class="gmail_default" style="">
          <div class="gmail_default"><font face="monospace, monospace">###
              <code r></font></div>
          <div class="gmail_default"><font face="monospace, monospace">treat
              <- gl(4, 15, labels = paste("t", 1:4, sep="")); treat #
              Fatores</font></div>
          <div class="gmail_default"><font face="monospace, monospace"><br>
            </font></div>
          <div class="gmail_default"><font face="monospace, monospace">#
              Variables</font></div>
          <div class="gmail_default"><font face="monospace, monospace">set.sed(124)</font></div>
          <div class="gmail_default"><font face="monospace, monospace">sp
               <- cbind(c(rnorm(10,  5, 0.25), rnorm(50, 2.5, 0.25)),
              rnorm(60, 2.5, 0.25),</font></div>
          <div class="gmail_default"><font face="monospace, monospace"> 
                         c(rnorm(10, 12, 0.25), rnorm(50, 2.5, 0.25)),
              rnorm(60, 2.5, 0.25))</font></div>
          <div class="gmail_default"><font face="monospace, monospace">colnames(sp)
              <- c("sp1", "sp2", "sp3", "sp4")</font></div>
          <div class="gmail_default"><font face="monospace, monospace">head(sp)</font></div>
          <div class="gmail_default"><font face="monospace, monospace"><br>
            </font></div>
          <div class="gmail_default"><font face="monospace, monospace">#Criação
              da matriz de contrastes </font></div>
          <div class="gmail_default"><font face="monospace, monospace">TI
                 <- model.matrix(~ treat-1)</font></div>
          <div class="gmail_default"><font face="monospace, monospace">head(TI)</font></div>
          <div class="gmail_default"><font face="monospace, monospace"><br>
            </font></div>
          <div class="gmail_default"><font face="monospace, monospace">f
                 <- length(levels(treat))</font></div>
          <div class="gmail_default"><font face="monospace, monospace">comb
              <- t(combn(1:f, 2))</font></div>
          <div class="gmail_default"><font face="monospace, monospace">n
                 <- nrow(comb)</font></div>
          <div class="gmail_default"><font face="monospace, monospace"><br>
            </font></div>
          <div class="gmail_default"><font face="monospace, monospace">contr2
              <- NULL</font></div>
          <div class="gmail_default"><font face="monospace, monospace">for
              (x in 1:n) {</font></div>
          <div class="gmail_default"><font face="monospace, monospace"> 
                 i <- comb[x, 1]</font></div>
          <div class="gmail_default"><font face="monospace, monospace"> 
                 j <- comb[x, 2]</font></div>
          <div class="gmail_default"><font face="monospace, monospace"> 
                 tmp <- list(TI[,i] - TI[,j]); names(tmp) <-
              paste0("TI",i, "_", j)</font></div>
          <div class="gmail_default"><font face="monospace, monospace"> 
                 contr2 <- c(contr2, tmp)</font></div>
          <div class="gmail_default"><font face="monospace, monospace">}</font></div>
          <div class="gmail_default"><font face="monospace, monospace">contr2</font></div>
          <div class="gmail_default"><font face="monospace, monospace"><br>
            </font></div>
          <div class="gmail_default"><font face="monospace, monospace">head(do.call(cbind,
              contr2))</font></div>
          <div class="gmail_default"><font face="monospace, monospace">#
                TI1_2 TI1_3 TI1_4 TI2_3 TI2_4 TI3_4</font></div>
          <div class="gmail_default"><font face="monospace, monospace">#
              1     1     1     1     0     0     0</font></div>
          <div class="gmail_default"><font face="monospace, monospace">#
              2     1     1     1     0     0     0</font></div>
          <div class="gmail_default"><font face="monospace, monospace">#
              3     1     1     1     0     0     0</font></div>
          <div class="gmail_default"><font face="monospace, monospace">#
              4     1     1     1     0     0     0</font></div>
          <div class="gmail_default"><font face="monospace, monospace">#
              5     1     1     1     0     0     0</font></div>
          <div class="gmail_default"><font face="monospace, monospace">#
              6     1     1     1     0     0     0</font></div>
          <div class="gmail_default"><font face="monospace, monospace">###
              </code></font></div>
        </div>
        <div class="gmail_extra"><font face="monospace, monospace"><br>
          </font></div>
        <div class="gmail_extra"><br clear="all">
          <div>
            <div class="gmail_signature">
              <div dir="ltr">
                <div>
                  <div dir="ltr">
                    <div>
                      <div dir="ltr">
                        <div>
                          <div dir="ltr"><font style="font-size:small"
                              face="arial, helvetica, sans-serif">
                              <div style="font-family:'trebuchet
                                ms',sans-serif;display:inline">​</div>
                            </font><font style="font-size:12.8px"
                              face="arial, helvetica, sans-serif"><span
                                style="font-size:small">================================================</span><br>
                              Éder Comunello</font>
                            <div style="font-size:12.8px"><span
                                style="font-family:arial,helvetica,sans-serif">Agronomist
                                (UEM), MSc in Environ. Sciences (UEM)</span><font
                                face="arial, helvetica, sans-serif"><br>
                              </font></div>
                            <div style="font-size:12.8px">
                              <div style="font-size:small"><span
                                  style="font-family:arial,helvetica,sans-serif">DSc
                                  in Agricultural Systems
                                  Engineering (USP/Esalq)</span><br>
                              </div>
                              <div><span style="font-size:small">Brazilian
                                  Agricultural Research Corporation (</span><font
                                  style="font-size:small" face="arial,
                                  helvetica, sans-serif">Embrapa)</font></div>
                              <div>
                                <div><font style="font-size:small"
                                    face="arial, helvetica, sans-serif">Dourados,
                                    MS, Brazil </font><font size="2"
                                    face="arial, helvetica, sans-serif">|<O>|</font></div>
                                <div style="font-size:small"><span
                                    style="font-family:arial,helvetica,sans-serif">================================================</span><br>
                                </div>
                              </div>
                            </div>
                            <div style="font-size:small"><font
                                face="arial, helvetica, sans-serif">GEO, </font>-22.2752,
                              -54.8182, 408m<span
                                style="font-family:arial,helvetica,sans-serif"><br>
                              </span></div>
                            <div style="font-size:12.8px"><span
                                style="font-size:small;font-family:arial,helvetica,sans-serif">UTC-04:00
                                / DST: UTC-03:00</span></div>
                            <div>
                              <div>
                                <div><br>
                                </div>
                                <div><br>
                                </div>
                              </div>
                              <div style="font-size:small"><br>
                              </div>
                            </div>
                          </div>
                        </div>
                      </div>
                    </div>
                  </div>
                </div>
              </div>
            </div>
          </div>
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      </div>
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      <pre wrap="">_______________________________________________
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