How can I select a system/model without opening it?

Is there a way to select a model so that bdroot points to it without opening it?

   load_system('model1');
   disp(bdroot); % bdroot is now 'model1')

   load_system('model2');
   disp(bdroot); % bdroot is now 'model2')

   % ****** 1. Code that require bdroot to be 'model2' 
   % ******    and 'model1' to be loaded.

   % ****** 2. code that require bdroot to be 'model1'.

How can number 2 be achieved without opening model1? Another load_system('model1') doesn't do the trick. I'm looking for a select_system() I guess.

[EDIT: A better example. Please paste into an m-file called solveme.m and call from MATLAB.]

   function solveme()
   % bdclose all % Uncomment if you have no unsaved work

   load_system('vdp');
   load_system('simulink');

   % Insert solution here! 
   %  -- open_system or other commands that makes the model visible are not
   %     permitted  
   % Extra credits if close_system and bdclose are not used

   disp(fcnt)

   function ret = fcnt()
   if strcmp(bdroot, 'vdp')
      ret = 'Sucess!';
   else
      ret = 'Failure!';
   end

Answer 1

[Andreas]

This topic is very old, but I'm really interestedin this feature. Is there any new functionality within simulink api?

[Matthew Manthey]

Me as well. Is there a select_system(), or something like it?

Answer 2

[Sachin Ganjare]

You can use:

set_param([bdroot,'model1']) %Do check the syntax please

Hope it helps!!!

[Johannes]

Thanks for your reply. But I really don't see how that would work.

[bdroot, 'model1']

will produce a string:

'model2model1'

And removing the "[", "]" will lead to the setting of a parameter 'model1' in model2. Can you please explain?

[Sachin Ganjare]

My bad, I did not understand the question correctly.

Before doing load_system for model1 you should close the open system i.e model2, otherwise bdroot will not point to recently loaded model.

load_system('model1');

disp(bdroot); % bdroot is now 'model1')

load_system('model2');

close_system('model1');

disp(bdroot); % bdroot is now 'model2')

[Johannes]

Thanks, that would work.

Answer 3

[Kaustubha Govind]

I can't think of a way to switch bdroot to another model, other than Sachin's idea of closing the current bdroot model(model2 in your example). Can your code be re-written to accept the model name as an argument instead of using bdroot? In general, MATLAB functions that use bdroot, gcs and gcb tend to be too presumptive.

[Johannes]

Thanks. A select_system() would be nice, don't you agree? Especially as load_system() and open_system() apparantly has differences other than the obvious visibilty thing.

I agree on that passing the model's name as an argument is the best solution. But the function is used widely (called from other scripts) so I'm reluctant to change its interface. But I will probably go ahead and do that anyway, with an option to pass the argument or not.

[Kaustubha Govind]

Johannes: I agree that something like select_system would be nice - could you please submit an enhancement request via MathWorks Tech Support to consider adding such an option for a future release?

Answer 4

[Matthew Manthey]

This is somewhat slow in my opinion, but I believe it serves the purpose

function select_system( obj )
  % Ignore the return value
  RTW.getBuildDir(obj);
end