Conditional Simulink Block Deletion?

The aim of the code is to scour a .mdl and delete any mux blocks that are not connected to anything (outport) and then their input signals on that condition. On a side note I am a massive noob.

Start by determining the paths of all the mux blocks:

mux_list = find_system(model_name, 'LookUnderMasks', 'all', 'BlockType', 'Mux')
number_of_mux = size(mux_list);
number_of_mux = number_of_mux(1);

Then proceed with the operation. The operation successfully deletes mux blocks who's outputs are not connected to anything. However, it also deletes mux blocks whose outports are connected to masked blocks (rather than standard blocks) - this is undesirable and is the issue.

if number_of_mux == 0

          disp('No Mux detected')

else

      muxies=num2cell(zeros(number_of_mux,1)); % memory preallocation.
      finalno = number_of_mux
      i = 1

      for i=1:1:number_of_mux

          muxies(i,:)=mux_list(i);     
         mux_current = char(mux_list(i))
          linehandle_current = get_param(mux_current, 'LineHandles');
          signal_current = linehandle_current.Inport;

          lolcats=get_param(mux_current, 'PortConnectivity')

          lolcats=lolcats.DstBlock

          deletequery = isempty(lolcats)

          if deletequery == 1
              delete_line(signal_current);
              delete_block(mux_current);
              mux_del_list{:,i}=mux_current;

          else
              finalno = finalno - 1

          end

      end
  disp([num2str(finalno), ' mux(s) of ', num2str(number_of_mux), ' were found and deleted. '])
  disp(char(mux_del_list))
  end

I presume I need some sort of paradigm shift in my approach to this to get it working as expected.

Best regards,

Brown

Answer 1

[Albert Yam]

Try

mux_list = find_system('test2', 'LookUnderMasks', 'all', 'BlockType', 'Mux');
number_of_mux = size(mux_list);
number_of_mux = number_of_mux(1);

if number_of_mux == 0
          disp('No Mux detected')
else
      muxies=num2cell(zeros(number_of_mux,1)); % memory preallocation.
      finalno = number_of_mux;
      i = 1;
      for i=1:1:number_of_mux
          muxies(i,:)=mux_list(i);     
         mux_current = char(mux_list(i));
          linehandle_current = get_param(mux_current, 'LineHandles');
          signal_current = linehandle_current.Inport;
%           lolcats=get_param(mux_current, 'PortConnectivity')
%           lolcats=lolcats.DstBlock
%           deletequery = isempty(lolcats)
          deletequery = linehandle_current.Outport == -1;   %%ONLY CHANGE
          if deletequery == 1
              delete_line(signal_current);
              delete_block(mux_current);
              mux_del_list{:,i}=mux_current;
          else
              finalno = finalno - 1;
          end
      end
  disp([num2str(finalno), ' mux(s) of ', num2str(number_of_mux), ' were found and deleted. '])
  disp(char(mux_del_list))
  end

[Craig]

deletequery = linehandle_current.Outport == -1

Thank you for this answer! So LineHandles returns -1 if no line exists - good to know.

Thanks again.

Brown