title: How to get row index number for particular name(s)?
body: <p>How can one determine the row index-numbers corresponding to particular row names? I have a vector of row names, and I would like to use these to obtain a vector of the corresponding row indices in a matrix. </p>
  
  <p>I tried <code>row()</code> and <code>as.integer(rownames(matrix.object))</code>, but neither seems to work. </p>