<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div><span>seuDataFrame$y <- cumsum(seuDataFrame$x)<br></span></div><div> </div><div>Elias T. Krainski<br><blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; margin-top: 5px; padding-left: 5px;"> <div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"> <div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"> <font face="Arial" size="2"> <hr size="1"> <b><span style="font-weight: bold;">De:</span></b> Luiz André Zardo <luiz.zardo@gmail.com><br> <b><span style="font-weight: bold;">Para:</span></b> r-br@listas.c3sl.ufpr.br <br> <b><span style="font-weight: bold;">Enviadas:</span></b> Segunda-feira, 19 de Dezembro de 2011 16:19<br> <b><span style="font-weight: bold;">Assunto:</span></b> [R-br] soma acumulada<br> </font> <br><meta
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<div>Prezados colegas,</div>
<div>Como faço para criar uma variável em um dataframe que seja soma acumulada de outra variável?</div>
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<td style="border: medium none rgb(236, 233, 216); background-color: transparent; min-height: 12.75pt; width: 48pt;" height="17" width="64"><font face="MS Sans Serif">i</font></td>
<td style="border: medium none rgb(236, 233, 216); background-color: transparent; width: 56pt;" width="74"><font face="MS Sans Serif">Xi</font></td>
<td style="border: medium none rgb(236, 233, 216); background-color: transparent; width: 56pt;" width="74"><font face="MS Sans Serif">Yi</font></td></tr>
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<td style="border: medium none rgb(236, 233, 216); background-color: transparent; min-height: 12.75pt;" height="17"><font face="MS Sans Serif">1</font></td>
<td style="border: medium none rgb(236, 233, 216); background-color: transparent;"><font face="MS Sans Serif">a</font></td>
<td style="border: medium none rgb(236, 233, 216); background-color: transparent;"><font face="MS Sans Serif">a</font></td></tr>
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<td style="border: medium none rgb(236, 233, 216); background-color: transparent; min-height: 12.75pt;" height="17"><font face="MS Sans Serif">2</font></td>
<td style="border: medium none rgb(236, 233, 216); background-color: transparent;"><font face="MS Sans Serif">b</font></td>
<td style="border: medium none rgb(236, 233, 216); background-color: transparent;"><font face="MS Sans Serif">a+b</font></td></tr>
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<td style="border: medium none rgb(236, 233, 216); background-color: transparent;"><font face="MS Sans Serif">c</font></td>
<td style="border: medium none rgb(236, 233, 216); background-color: transparent;"><font face="MS Sans Serif">a+b+c</font></td></tr></tbody></table></div>
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<div>Obrigado.</div></div><br>
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