How to solve "Dot indexing is not supported for variables of this type...."?

Hi,

I wrote a small script to made 4 modules and connection betweeen (pic attached).

I got error message while I tried to connect phisical POS and got "Dot indexing not support for variableof this type".

Can someone help tounderstand whats the problem?

file Matlab script:

open_system('String_arc')
mdl = 'String_arc';
Cube_model = find_system(mdl,'FindAll','on','Name','String_arc');


%%% add basic Module:
    for v=1:4     %% loop for 4 Modules
        nl=num2str(v);
        Add_module(v) = add_block('Mod_26_cells/Module_MC 1', [mdl,'/Module_MC ',nl]);
        
        posc = get(Add_module(v),'Position');
        set(Add_module(v),'Position',posc + [100 120*(v-1)-45 100 120*(v-1)-45])
        PH_Add_module{v}=get(Add_module(v),'PortHandles');
        
        %%% connect minus to plus ports:
        if v>1
            add_line(mdl,PH_Add_module{v-1}.LConn(2),PH_Add_module{v}.LConn(1),'Autorouting','on');
        end
    end

% connect the POS port to first CELL (Cell 1):
Plus_str = find_system(mdl,'LookUnderMasks','All','FindAll','on','Name','POS');
PH_plus2str=get(Plus_str,'PortHandles');
add_line(mdl,Plus_str.RConn,PH_Add_module{1}.LConn(1), 'Autorouting','on');

[Walter Roberson]

Is the error showing up on the line

            add_line(mdl,PH_Add_module{v-1}.LConn(2),PH_Add_module{v}.LConn(1),'Autorouting','on');

or is the error showing up on the line

            add_line(mdl,Plus_str.RConn,PH_Add_module{1}.LConn(1), 'Autorouting','on');

[Tommy]

Hi,

Yes, error ralate to second line:

add_line(mdl,Plus_str.RConn,PH_Add_module{1}.LConn(1), 'Autorouting','on');

Thanks

[Walter Roberson]

What happens if

Plus_str = find_system(mdl,'LookUnderMasks','All','FindAll','on','Name','POS');

returns empty because no system named POS was found?

[Tommy]

Hi,

But POS is PMC_port stick on canvas...a basic slx flie shown on pic above.....

Answer 1

[Walter Roberson]

What happens if the command returns empty because no matching lines, ports, or annotations were found?

https://www.mathworks.com/help/simulink/slref/find_system.html#mw_c12f0213-2434-409f-a29b-92e3c2de36a6

Option to search for a specific type of model element, specified as one of these:

• 'block'
• 'line'
• 'port'
• 'annotation'

To find lines, ports, or annotations in the model, you must first specify the value of FindAll as 'on', and then the value of Type.

You did not specify 'type' in your search, so no searching by port would be done.

[Tommy]

Hi,

I don't get your point.

what you mentioned, allready written:

Plus_str = find_system(mdl,'LookUnderMasks','All','FindAll','on','Name','POS');
.....

[Walter Roberson]

Plus_str = find_system(mdl, 'LookUnderMasks', 'All', 'FindAll', 'on', 'Type', 'port', 'Name', 'POS');

It is specifically documented that in order to search by port that you have to 'type', 'port' and also specify FindAll

[Tommy]

Hi,

wow, Still got same error:

Plus_str = find_system(mdl, 'LookUnderMasks', 'All', 'FindAll', 'on', 'Type', 'port', 'Name', 'POS');
PH_plus2str=get(Plus_str,'PortHandles');
add_line(mdl,PH_plus2str.RConn,PH_Add_module{2}.LConn(1), 'Autorouting','on');

ot indexing is not supported for variables of this type.

Error in String_Array (line 33)

add_line(mdl,PH_plus2str.RConn,PH_Add_module{2}.LConn(1), 'Autorouting','on');

[Steven Lord]

Add these commands immediately before the add_line call and show us exactly what gets returned by each of the commands.

PH_plus2str
PH_Add_module{2}

If PH_plus2str is empty, show us the output of this command as well:

Plus_str

If that too shows an empty array, let's try finding all the ports in your system and see what their Name properties are. I'm leaving the semicolon off deliberately as I want to see what and how many ports find_system finds.

Plus_str = find_system(mdl, 'LookUnderMasks', 'All', 'FindAll', 'on', 'Type', 'port')

[Tommy]

Hi,

Just added as you recomended:

Plus_str = find_system(mdl, 'LookUnderMasks', 'All', 'FindAll', 'on', 'Name', 'POS')
PH_Plus2str=get(Plus_str,'PortHandles');
PH_plus2str
PH_Add_module{2}

add_line(mdl,PH_plus2str.RConn,PH_Add_module{2}.LConn(2), 'Autorouting','on');

results:

>> String_Array

Plus_str =

1.0e+03 *

0.6820

4.1509

0.0030

Unrecognized function or variable 'PH_plus2str'.

Error in String_Array (line 36)

PH_plus2str

[Tommy]

Hi,

Please, see result below:

>> String_Array

Plus_str =

   1.0e+03 *

    0.6820
    4.6621
    0.0030


PH_Plus2str =

  3×1 cell array

    {1×1 struct}
    {1×1 struct}
    {1×1 struct}


ans = 

  struct with fields:

      Inport: []
     Outport: 4.7481e+03
      Enable: []
     Trigger: []
       State: []
       LConn: [1.2490e+04 4.7491e+03]
       RConn: []
    Ifaction: []
       Reset: []

Dot indexing is not supported for variables of this type.

Error in String_Array (line 44)
add_line(mdl,PH_Plus2str.RConn,PH_Add_module{2}.LConn(2), 'Autorouting','on');
>> 

[Torsten]

According to your output, PH_plus2str.RConn does not exist. Maybe you could show us what is hidden behind PH_plus2str{i} for i = 1,2,3.

[Tommy]

How to do it?

[Walter Roberson]

disp(PH_plus2str{1})

[Tommy]

Plus_str = find_system(mdl, 'LookUnderMasks', 'All', 'FindAll', 'on', 'Name', 'POS')
PH_Plus2str=get(Plus_str,'PortHandles');
 for i = 1:3
     PH_Plus2str{i}
end


%     PH_Plus2str
PH_Add_module{2}

add_line(mdl,PH_Plus2str.RConn,PH_Add_module{2}.LConn(2), 'Autorouting','on');

>> String_Array

Plus_str =

1.0e+03 *

0.6820

4.6622

0.0030

ans =

struct with fields:

Inport: []

Outport: []

Enable: []

Trigger: []

State: []

LConn: []

RConn: 1.2492e+04

Ifaction: []

Reset: []

ans =

struct with fields:

Inport: []

Outport: []

Enable: []

Trigger: []

State: []

LConn: []

RConn: 1.2493e+04

Ifaction: []

Reset: []

ans =

struct with fields:

Inport: []

Outport: []

Enable: []

Trigger: []

State: []

LConn: []

RConn: 5.0310

Ifaction: []

Reset: []

ans =

struct with fields:

Inport: []

Outport: 4.7482e+03

Enable: []

Trigger: []

State: []

LConn: [1.2490e+04 4.7492e+03]

RConn: []

Ifaction: []

Reset: []

Dot indexing is not supported for variables of this type.

Error in String_Array (line 49)

add_line(mdl,PH_Plus2str.RConn,PH_Add_module{2}.LConn(2), 'Autorouting','on');

[Torsten]

So you see that

add_line(mdl,PH_Plus2str{i}.RConn,PH_Add_module{2}.LConn(2), 'Autorouting','on');

should work if you set i to 1, 2 or 3.

[Walter Roberson]

cellfun(@(C)addline(mdl,C.RConn,PH_Add_module{2}.LConn(2), 'Autorouting','on'), PH_Plus2str, 'uniform', 0);

[Tommy]

what is cellfun(@(C)addline ?

[Tommy]

cellfun(@(C)add_line(mdl,C.RConn,PH_Add_module{2}.LConn(2), 'Autorouting','on'), PH_Plus2str, 'uniform', 0);

Error using String_Array>@(C)add_line(mdl,C.RConn,PH_Add_module{2}.LConn(2),'Autorouting','on') (line 50)

The port handle does not belong to any object within the system 'String_arc'

Error in String_Array (line 50)

cellfun(@(C)add_line(mdl,C.RConn,PH_Add_module{2}.LConn(2), 'Autorouting','on'), PH_Plus2str, 'uniform', 0); - Show complete stack trace

[Walter Roberson]

cellfun -- apply a function to each element of a cell.

So we are taking the cell array PH_Plus2str and for each member of the cell array we are applying the anonymous function

@(C)addline(mdl,C.RConn,PH_Add_module{2}.LConn(2), 'Autorouting','on')

The anonymous function accepts the contents of one cell at a time, and applies the function

addline(mdl,C.RConn,PH_Add_module{2}.LConn(2), 'Autorouting','on')

to the contents, with C replaced by the contents of the cell entry.

Another way of expressing this would have been

for i = 1 : numel(PH_Plus2str)
    addline(mdl,PH_Plus2str{i}.RConn,PH_Add_module{2}.LConn(2), 'Autorouting','on');
end

[Torsten]

"C" in the command

addline(mdl,C.RConn,PH_Add_module{2}.LConn(2), 'Autorouting','on')

is substituted by PH_Plus2str{1},PH_Plus2str{2},PH_Plus2str{3} one after the other.

Output of

cellfun(@(C)addline(mdl,C.RConn,PH_Add_module{2}.LConn(2), 'Autorouting','on'), PH_Plus2str, 'uniform', 0);

is a cell array with elements

{addline(mdl,PH_Plus2str{1}.RConn,PH_Add_module{2}.LConn(2), 'Autorouting','on'),addline(mdl,PH_Plus2str{2}.RConn,PH_Add_module{2}.LConn(2), 'Autorouting','on'),addline(mdl,PH_Plus2str{3}.RConn,PH_Add_module{2}.LConn(2), 'Autorouting','on')}

[Tommy]

After adding last line....

>> String_Array

Plus_str =

1.0e+03 *

0.6820

4.6623

0.0030

Error using String_Array (line 51)

The port handle does not belong to any object within the system 'String_arc'

[Tommy]

I belive add_line instead addline...

[Tommy]

[Tommy]

connection between POS and NEG PMC_port ....(mark as 1 and 2)