<p>
  
  The different block types have different properties that the user can set.
  
  <h2>LTPDA Algorithm Blocks</h2>
  
  LTPDA Algorithm blocks (MBlocks) have both <i>properties</i> and <i>parameters</i>.  
  <br>
  Properties of an MBlock are
  <br>
  <table cellspacing="0" class="body" cellpadding="2" border="1" width="80%">
    <colgroup>
      <col width="20%"/>
      <col width="80%"/>
    </colgroup>
    <thead>
      <tr valign="top">
        <th class="categorylist">Property</th>
        <th class="categorylist">Description</th>
      </tr>
    </thead>
    <tbody>
      <!-- Name -->
      <tr valign="top">
        <td bgcolor="#f3f4f5">
          <p>Name</p>
        </td>
        <td bgcolor="#f3f4f5">
          <p>The name of the block as it appears on the canvas Block names are unique on a canvas. This is also the
          string that will be converted to a valid MATLAB variable name when the pipeline is executed.</p>
        </td>
      </tr>
      <!-- Modifier -->
      <tr valign="top">
        <td bgcolor="#f3f4f5">
          <p>Modifier</p>
        </td>
        <td bgcolor="#f3f4f5">
          <p>
            Set this block to be a modifier or not. For more details on modifier blocks in LTPDA see 
            <a href="objects_working.html#calling">Calling object methods</a>. The accepted values
            are "true" or "false".
          </p>
        </td>
      </tr>
    </tbody>
  </table>
  <br>
  <p>
    To set the properties of a block, select one or more MBlocks, then double
    click in the value column entry for the property you want to change. Enter the 
    new value and press return/enter.
  </p>
  
  <h3> Setting the parameter list </h3>
  
  <p>
    LTPDA Algorithm Blocks also have parameters which translate as a parameter list upon execution. To set
    the parameters of a block, click on a block (or multiple MBlocks which represent the same LTPDA algorithm). You
    will then see the 'current parameters' that the block holds. To edit the 'key' or 'value' of a parameter, double
    click the table entry you want to edit, enter the new value, and hit <tt>enter</tt> or click OK.
  </p>
  <p>
    To add or remove parameters from this list use the 'plus' and 'minus' buttons.
  </p>
  <p>
    You can also select a set of predefined parameter sets from the drop-down menu above the parameter table.
    Having selected a parameter set, you need to click the 'set' button to push these parameters to the block. You can then
    go ahead and add or remove parameters from the 'current parameters' on the block.
  </p>
  <p>
    Editing of most parameter keys and values is done in a simple editor dialog box. However, there are some
    key/value pairs which are edited using special dialog boxes:
  </p>
  
  <h4>Built-in models of AO and SSM classes</h4>
  <p>
    Both the AO and the SSM classes can be built from pre-defined, built-in
    models. These are typically created with a plist containing the key <tt>BUILT-IN</tt>.
    If you try to edit the value for this key for one of these constructors, you will be 
    presented with a dialog box that allows you to choose from the built-in models. For all
    other classes, editing the value for the key <tt>BUILT-IN</tt> is done via a standard
    input dialog.
  </p>
  <br>
  <br>
  <img src="images/model_dialog.png" alt="Model dialog" border="3">
  <br>
  <br>
  
  <h4>Pole/zero model editor</h4>
  <p>
    If any block has a parameter with the key <tt>PZMODEL</tt> then the 
    corresponding value will be edited via the Pole/zero model editor. Here 
    you can type directly in the constructor edit box, or you can add/remove
    poles and zeros from the lists. To edit the frequency or Q of a pole or 
    zero, double-click on the table entry. To enter a real pole or zero (no Q),
    set the Q to 'NaN'.
  </p>
  <br>
  <br>
  <img src="images/pzmodel_editor.png" alt="Model dialog" border="3">
  <br>
  <br>
  
  <h4>Spectral window selector</h4>
  <p>
    Many algorithms in LTPDA accept a parameter with the key <tt>WIN</tt> for
    a spectral window parameter. Editing the value for such a parameter presents
    the user with a dialog where the spectral window can be selected from the list
    of supported windows. You can also type the constructor directly in the edit
    box.
  </p>
  <br>
  <br>
  <img src="images/specwin_editor.png" alt="Model dialog" border="3">
  <br>
  <br>
  
  <h4>Repository hostname selector</h4>
  <p>
    Editing parameters with the key <tt>hostname</tt> will give the user
    a dialog containing the pop-up menu of possible hostnames. This list of 
    hostnames is taken from the LTPDA Preferences. If the preferences are changed,
    the workbench needs to be closed and reopened for the changes to propogate.
  </p>
  
  <h4>Filenames</h4>
  <p>
    If the parameter list contains a parameter with the key <tt>FILENAME</tt>, this
    will be edited using standard file dialog boxes. If the block algorithm is <tt>save</tt>
    a save dialog is presented. In all other cases, a load dialog is presented.
  </p>
  
  
  <h2>MATLAB Expression Blocks</h2>
  
  MATLAB Expression blocks have two properties:
  <br>
  <table cellspacing="0" class="body" cellpadding="2" border="1" width="80%">
    <colgroup>
      <col width="20%"/>
      <col width="80%"/>
    </colgroup>
    <thead>
      <tr valign="top">
        <th class="categorylist">Property</th>
        <th class="categorylist">Description</th>
      </tr>
    </thead>
    <tbody>
      <!-- Name -->
      <tr valign="top">
        <td bgcolor="#f3f4f5">
          <p>Name</p>
        </td>
        <td bgcolor="#f3f4f5">
          <p>The name of the block as it appears on the canvas Block names are unique on a canvas. This is also the
          string that will be converted to a valid MATLAB variable name when the pipeline is executed.</p>
        </td>
      </tr>
      <!-- Modifier -->
      <tr valign="top">
        <td bgcolor="#f3f4f5">
          <p>Expression</p>
        </td>
        <td bgcolor="#f3f4f5">
          <p>
            This is the (valid) MATLAB expression which, when evaluated, will be set to the variable name.
          </p>
        </td>
      </tr>
    </tbody>
  </table>
  <br>  
  To set the properties of a block, select one or more MATBlocks then double
  click in the value column entry for the property you want to change. Enter the 
  new value and press return/enter.
  
  Alternatively, you can double-click on a MATBlock to get a dialog box where you can enter the expression.
    
  
  <h2>MATLAB Constant Blocks</h2>
  
  Setting of properties on a MATLAB Constant block is just the same as MATBlocks; these blocks only differ
  in the way they are handled at the time of execution.
  
  
  <h2>Annotation Blocks</h2>
  
  To set the text of an Annotation block, double click on the text area to start editing. Click off the block
  to end editing.
  
  
</p>