title: How to use a MATLAB file as a file source in GNU Radio
body: <p>I designed a filter and applied it to a random noise signal using SPTool in MATLAB. My noise signal was <code>x = (1/sqrt(2))*(randn(1024,1)+j*randn(1024,1))</code></p>
  
  <p>Once I've applied my filter to this noise signal, how can I take that filtered signal and use it as a file source in GNU Radio Companion (which I will connect to QT GUI Frequency Sink)? I tried exporting the signal using SPTool but I'm unsure what file extension I can use for GNU Radio. Thanks in advance.</p>