Dot indexing is not supported for variables of this type in a for loop

Hi , I'm trying to get data from a simulink model and print it in matlab workspace . so first I loaded the model using : load_system('C:/Users/nouu_/Desktop/model.slx') then I got the blocks that are in the model using : bl = getfullname(Simulink.findBlocks('model')) , then I used the following commands to know the input and output of each block , I mean to know which block is connected to the input or output of each block , in the following lines I'm using the block "Pipe Bend" as an example :

b = get_param('model/Pipe Bend','PortConnectivity')
n=numel(b)
for k=1:n
      s=get(b(k).SrcBlock);
      f='Source';
      if isempty(s)
         s=get(b(k).DstBlock);
         f='Destinataion';
      end
      out{k,1}=f;  
      out{k,2}=s.BlockType;
      out{k,3}=s.Name
   end
   disp(out)

but whenever I execute this for loop I get the following error : Dot indexing is not supported for variables of this type.

and another question : is there something wrong with this for loop ? as in some cases like the case of this pipe it prints that other 2 blocks are connected to its output(destination) whichis wrong because one block is input and the other is output .

any help is appreciated , Thanks

Answer 1

[Guillaume]

Typically, you'll get this error because the structure or object you're indexing with . is empty.

Indeed, you have this bit of code:

      s=get(b(k).SrcBlock); 
      if isempty(s)                %so get(b(k).SrcBlock) returned empty
         s=get(b(k).DstBlock);     %and you're asking for the same again, which is still going to be empty
      end
      out{k,2}=s.BlockType;       %errors if s is empty

So, you test for s being empty, but if it is you call exactly the same function that returned empty, so it's still going to be empty. Hence the error when you index s.

I don't know simulink so can't really tell what you're trying to do, but clearly your logic is wrong.

[Nouran Adel]

yes you are right I've put some blocks in simulink but I have not connected all their ports to other blocks so some ports are empty and maybe this is why this error appears . Thanks :)