t.html?is-external=true" title="class or interface in java.io" class="externalLink">DataInput</a>&nbsp;in,
                                  int&nbsp;nRows)
                           throws <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/io/IOException.html?is-external=true" title="class or interface in java.io" class="externalLink">IOException</a></pre>
<div class="block">Read groups from a file. Note that the information about how many should be in the file already.</div>
<dl>
