title: Sage quadratic regression -- numbers too large?
body: <p>I am trying to do a (quadratic) regression using Sage and the largest point I have is of this order of magnitude: <code>(xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx, xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx)</code> (number of digits shown).</p>
  <p>When I run the code:</p>
  <pre><code>var('a,b,c')
  model(x) = a*x^2+b*x+c
  find_fit(data,model)
  </code></pre>
  <p>(yes, data is already defined)</p>
  <p>The fit I get is: <code>[a == 1.0, b == 1.0, c == 1.0]</code> which is not even close to correct. Is this because my numbers are too large or is there some other reason?</p>