title: Non-linear regression analysis in R
body: <p>I'm a R novice but I'm looking for a way to determine the three parameters A, B and C related by the following function in R:</p>
  
  <p><code>y = A * (x1^B) * (x2^C)</code></p>
  
  <p>Can someone give me some hints about R method(s) that would help me to achieve such a fitting?</p>