title: Convert float64 array to float32 array
body: <p>I have an array of float64 and want to convert each value to float32.</p>
  
  <p>I've tried: </p>
  
  <pre><code># What I have 
  features64 [120]float64
  
  # What I've tried
  features32 = [120]float32(features64)
  </code></pre>
  
  <p>But that gives the compile error:</p>
  
  <blockquote>
    <p>cannot convert features (type [120]float64) to type [120]float32</p>
  </blockquote>