title: Simulink From Workspace: can't use timestamps from matrix
body: <p>I'm using the simulink block From Workspace to read in some audio data provided by a script. I have formatted the data in a matrix with 2 columns, the first is the timestamp and the second is the data.</p>
  
  <p>In the configuration paramaters, I have specified Fixed-Step and Discrete solver. The Start time and Stop also need to be configured manually and don't seem to come from the data.</p>
  
  <p>Also, in the From Workspace block configuration, I need to specify the sample time (1/44100) or I get a warning if I specify -1, to inherit from the data and then get strange sample times.</p>
  
  <p>So, how can I get simulink to use only the sample times in the matrix and use the first and last timestamps as the start and stop time of the simulation?</p>