title: How to keep the numeric part of a string in R
body: <p>The text below is an output in text format. I want to retain or extract only the numeric part of a string using R. For example, I want to extract 56.1129 (as numeric) from a file containing the text below. I am reading the text line by line and would like to extract the value associated with '1 Animal'. It would be great if I could convert them to columns and extract lines 2 (Variance) and 3 (pheno1) as well.</p>
  
  <pre><code>---------------------------- -------------------------------------
             - - - Results from analysis of BBBt - - -
  
     1 Animal                   56.1129    
     2 Variance                 47.6055    
     3 pheno1  1                 103.72       0.92562    
  Her1        = Animal     1/pheno1     3=          0.5410    0.0162
  Notice: The parameter estimates are followed by their approximate standard errors.
  ----------------------------------------------------------------
  </code></pre>