title: Finding maximum value in a column and return row number
body: <p>I would like to find out which row number contains the maximum value.</p>
  
  <p>I have tried something like this:</p>
  
  <pre><code>specimen = loadtxt('dataFile.dat')
  stress = specimen[:,3]*(1+(specimen[:,2]/100))
  strain = log(1+ specimen[:,2]/100)*100
  
  m = max(stress) #&lt;-- at which row??
  print m
  print row
  </code></pre>