title: Rename an inport and outport of Subsystem
body: <p>I am parsing a text file with matlab and trying to create a Simulink model from Matlab.</p>
  
  <pre><code>new_system(link_NameValue);
  add_block('simulink/Ports &amp; Subsystems/Subsystem',[link_NameValue '/' link_NameValue]);
  set_param(gcb,'Description',sprintf('%s ==&gt; %s', link_SourceNameValue, link_TargetNameValue));
  set_param('On_Off/On_Off/In1','Port number',link_SourcePortNameValue);
  </code></pre>
  
  <p>I would like to rename name of Input In1 and Output Out1 of the subsystem with some parsed value.
  I have tried this but returned me : </p>
  
  <pre><code>Inport block does not have a parameter named 'Port number'
  </code></pre>
  
  <p>Tried also with 'port' instead of 'Port number' but returned me : </p>
  
  <pre><code>Port number specified in 'On_Off/On_Off/In1' is invalid.  Port numbers must be positive integer constants less than or equal to 65535.
  </code></pre>
  
  <p>Thanks for help !</p>