Caros colegas, uma pequena dúvida. Como posso combinar apenas as linhas de um data.frame(ou matriz) cuja interseção seja zero?
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<div><strong>Exemplo:</strong></div>

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<div>dat &lt;- data.frame(1:6,matrix(c(1:5,3:7,5:9,6:10,11:15,2:6),,5,byrow=T))</div>

<div>colnames(dat) &lt;- c(&quot;id&quot;,&quot;A&quot;,&quot;B&quot;,&quot;C&quot;,&quot;D&quot;,&quot;E&quot;)</div>

<div>&nbsp;</div>

<div><strong># Sa&iacute;da:</strong></div>

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<div>&nbsp; id&nbsp; A&nbsp; B&nbsp; C&nbsp; D&nbsp; E</div>

<div>&nbsp; &nbsp;1&nbsp; 1&nbsp; 2&nbsp; 3&nbsp; 4&nbsp; 5</div>

<div>&nbsp; &nbsp;2&nbsp; 3&nbsp; 4&nbsp; 5&nbsp; 6&nbsp; 7</div>

<div>&nbsp; &nbsp;3&nbsp; 5&nbsp; 6&nbsp; 7&nbsp; 8&nbsp; 9</div>

<div>&nbsp; &nbsp;4&nbsp; 6&nbsp; 7&nbsp; 8&nbsp; 9 10</div>

<div>&nbsp; &nbsp;5 11 12 13 14 15</div>

<div>&nbsp; &nbsp;6&nbsp; 2&nbsp; 3&nbsp; 4&nbsp; 5&nbsp; 6</div>

<div>&nbsp;</div>

<div><strong># Resultado desejado:</strong></div>

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<div>&nbsp; id&nbsp; &nbsp; A&nbsp; B&nbsp; C&nbsp; D&nbsp; E&nbsp; &nbsp; A&nbsp; B&nbsp; C&nbsp; D&nbsp; E&nbsp; &nbsp; id</div>

<div>&nbsp; &nbsp;1&nbsp; &nbsp; 1&nbsp; 2&nbsp; 3&nbsp; 4&nbsp; 5&nbsp; &nbsp; &nbsp; 6&nbsp; 7&nbsp; 8&nbsp; 9 10&nbsp; &nbsp; &nbsp; &nbsp;4&nbsp; &nbsp;&nbsp;</div>

<div>&nbsp; &nbsp;1&nbsp; &nbsp;<span style="white-space:pre"> </span>1&nbsp; 2&nbsp; 3&nbsp; 4&nbsp; 5&nbsp; &nbsp; &nbsp;11 12 13 14 15&nbsp; &nbsp;&nbsp;5<span style="white-space:pre"> </span></div>
<br />
desde j&aacute; grato!<br />
<br />
<em>Att.<br />
Andr&eacute;</em></div>