title: How to find row number of a value in R code
body: <p>In the following set of values how can I find the row number of a particular value in column 4 ??</p>
  
  <p>For example how can I find the row number of the value "1578" that's in column number 4 using the R code commands.</p>
  
  <pre><code>&gt; mydata_2
     sex age height_seca1 height_chad1 height_DL weight_alog1
  1    F  19         1800         1797       180         70.0
  2    F  19         1682         1670       167         69.0
  3    F  21         1765         1765       178         80.0
  4    F  21         1829         1833       181         74.0
  5    F  21         1706         1705       170        103.0
  6    F  18         1607         1606       160         76.0
  7    F  19         1578         1576       156         50.0
  8    F  19         1577         1575       156         61.0
  9    F  21         1666         1665       166         52.0
  10   F  17         1710         1716       172         65.0
  11   F  28         1616         1619       161         65.5
  12   F  22         1648         1644       165         57.5
  13   F  19         1569         1570       155         55.0
  14   F  19         1779         1777       177         55.0
  15   M  18         1773         1772       179         70.0
  16   M  18         1816         1809       181         81.0
  17   M  19         1766         1765       178         77.0
  18   M  19         1745         1741       174         76.0
  19   M  18         1716         1714       170         71.0
  20   M  21         1785         1783       179         64.0
  21   M  19         1850         1854       185         71.0
  22   M  31         1875         1880       188         95.0
  23   M  26         1877         1877       186        105.5
  24   M  19         1836         1837       185        100.0
  25   M  18         1825         1823       182         85.0
  26   M  19         1755         1754       174         79.0
  27   M  26         1658         1658       165         69.0
  28   M  20         1816         1818       183         84.0
  29   M  18         1755         1755       175         67.0
  </code></pre>