title: Find accuracy of neural network application result
body: <p>I couldn't find anything useful about accuracy of results in neural network,</p>
  
  <ol>
  <li><p>I run character recognition example in Matlab, after network training and simulation by input test, how can I compute accuracy of output result after simulation?</p></li>
  <li><p>for some reasons(Research) after network training I want to change some neuron weights and simulate by input test then how can I compute its output accuracy compared to exact output result? and Is this task possible in neural network,</p></li>
  </ol>
  
  <p>Thanks in advance for any help.</p>