MATLAB: How to display port names in S-Function block just like they show up for Simulink subsystems

port names-functionsimulink

When we use input/output ports with Simulink Subsystems, their names (assigned inside the subsystem) appear outside the subsystem block. Similar is the case with MATLAB Function. I want the same functionality for the ports of blocks defined as Level-2 Matlab S-Functions. Any way for this?

Best Answer

You can create a Mask on top of the block and create your own icon and port labels. Right click on the block and select Mask>Create Mask. In the "Icon Drawing Commands" box enter commands like:

port_label('input', 1, 'input1');
port_label('output', 1, 'output1');

Related Solutions

MATLAB: How to change the port names of an S-Function block within the MATLAB File S-Function in Simulink 7.1 (R2008a)

The ability to change port names of an S-Function from within a Level-2 MATLAB File S-Function is not available in Simulink.

The workaround is to mask the block in order to create your custom input and output port names. I have attached an example with this e-mail that shows a masked subsystem with port labels that were created with the PORT_LABEL command.

In order to set up something similar with your S-Function block, please do the following:

1. Select the S-Function block and all the signal lines going in and leaving the block.

2. Right-click the block and select "Create Subsystem" from the context menu.

3. Right-click the subsystem block and select "Create Mask" from the context menu. The Mask Editor window will pop up.

4. In the "Icon & Ports" tab, under "Icon Drawing commands", you can write PORT_LABEL commands as shown in the following document:

http://www.mathworks.com/help/toolbox/simulink/slref/port_label.html

5. To make further edits, you can right-click the Subsystem block and select "Edit Mask" from the context menu.

You can also consider creating the mask programmatically, by following the steps detailed in the documentation:

https://www.mathworks.com/help/simulink/ug/control-masks-programmatically.html

MATLAB: Problems with MaskDisplay command

You can just execute what you're passing in as the third parameter to set_param to make sure that it's a string (and not a cell-array). I get the same error in MATLAB when I say:

>> {'disp('{\bf\it\fontsize{20}\fontname{Calisto MT}MODEL}', 'texmode','on'); port_label('output', 1, 'qpp'); port_label('output', 2, 'qp'); port_label('output', 3, 'q'); port_label('input', 1, 'u')'}
   {'disp('{\bf\it\fontsize{20}\fontname{Calisto MT}MODEL}', 'texmode','on'); port_label('output', 1, 'qpp'); port_label('output', 2, 'qp'); port_label('output', 3, 'q'); port_label('input', 1, 'u')'}
           |
  Error: Unbalanced or unexpected parenthesis or bracket.

Just from a cursory glance, the problem is that you are not escaping the quotes in the string. So you need:

   set_param('sys/blockname', 'MaskDisplay', 'disp(''{\bf\it\fontsize{20}\fontname{Calisto MT}MODEL}'', ''texmode'',''on''); port_label(''output'', 1, ''qpp''); port_label(''output'', 2, ''qp''); port_label(''output'', 3, ''q''); port_label(''input'', 1, ''u'')')

Best Answer

Related Solutions

MATLAB: How to change the port names of an S-Function block within the MATLAB File S-Function in Simulink 7.1 (R2008a)

MATLAB: Problems with MaskDisplay command

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