MATLAB: Does the Simulink.Annotation object not save correctly or behave strangely in Simulink 7.4 (R2009b)

annotation;getcallbackannotationsimulink

I have Simulink annotation in a model. I can change this annotation object either via the click function callback or manually. When I save the model and reopen it, the annotation reverts back to its original value. Why is this?

Best Answer

This is expected behavior for a Simulink.Annotation object that has a defined LoadFcn in that changes its own Text field in Simulink 7.4 (R2009b).

Load your model and observe the MATLAB base workspace. Alternatively, you can type

whos

to see if you have any Simulink.Annotation objects in your workspace.

If none are present, use the following code to create a handle to any annotation objects;

ah = find_system(gcs, 'FindAll', 'on', 'type', 'annotation');

If you have multiple annotations in your model you may need to reference into the handle such as

get(ah(1))

Observe the LoadFcn of the annotation in question. If this object has a non-null LoadFcn, this will both load the annotation object's handle into the MATLAB workspace when you load the model as well as perform the operation defined in the LoadFcn. In some cases, this may reset the text of the annotation object itself.

The attached example model illustrates this behavior. Load this model and perform the steps above to inspect this issue.

Related Solutions

MATLAB: How to force execution of the ClickFcn callback of a Simulink annotation object every time I update the block diagram

The ability to execute a callback for an annotation object when the block diagram is updated is not available in Simulink.

Simulink.Annotation objects are data objects and do not have an InitFcn callback associated with them, as for Simulink library blocks.

In order to work around this issue, evaluate the ClickFcn code in the model's InitFcn callback, by using the Simulink.Annotation objects' ClickFcn property as follows:

annotationHandles = find_system(gcs, 'FindAll', 'on', 'type', 'annotation');  
for annotationIndex = 1:length(annotationHandles)  
annotationObject = get_param(annotationHandles(annotationIndex), 'Object');  
eval(annotationObject.ClickFcn)
end

However, note that the callback code is executed in the base workspace. Therefore, operations (such as GETCALLBACKANNOTATION) that depend on being invoked from the annotation callback do not behave as expected.

In cases where GETCALLBACKANNOTATION is used, the entire callback code must be implemented in the InitFcn callback as follows:

annotationHandles = find_system(gcs, 'FindAll', 'on', 'type', 'annotation');  
for annotationIndex = 1:length(annotationHandles)  
annotationObject = get_param(annotationHandles(annotationIndex), 'Object');  
annotationObject.Text = [gcs ' : ' annotationObject.Text];
end

MATLAB: How to modify the figure properties of a CLUSTERGRAM object in the BioInformatics Toolbox in MATLAB 7.6.0 (R2008a)

This enhancement has been incorporated in Release 2009b (R2009b). For previous product releases, read below for any possible workarounds:

To modify the properties of the clustergram figure, it is necessary to create a figure out of the clustergram and manipulate the figure properties. This can be done interactively or programmatically.

To perform the steps interactively:

1. Go to the menu bar of the clustergram object and navigate to File->Print to Figure. This will create a figure object whose properties you can modify.

2. Click on the arrow pointer tool and double click on the object in the figure window that you wish to modify. Or, on the Menu bar of the new figure, select the Edit menu, and then select the object whose properties you wish to modify.

3. In the Property Editor that opens up, edit the desired properties or choose "More Properties" to see additional properties.

For more information on using the property editor, open the MATLAB documentation by typing 'doc' at the MATLAB command prompt. Then navigate to:

MATLAB->Graphics->Plots and Plotting Tools->Plotting Tools - Interactive Plotting->Property Editor

To make the changes programmatically it is necessary to grab a handle to to the figure associated with the clustergram and then manipulate the figure properties. The following code demonstrates how to obtain the figure handle:

First, make all handles visible. This is necessary because clustergram objects are created with 'HandleVisibility' property set to 'off':

set(0,'ShowHiddenHandles','on')

Then, get all handles under the root object:

allhnds = get(0,'Children');

Find the handles that correspond to clustergram objects

cgfigidx = strmatch('Clustergram',get(allhnds,'Tag'));
cffighnd = allhnds(cgfigidx);

Make the non-visible handles hidden again

set(0,'showhiddenHandles','off')

Finally, if there is more than one clustergram object, operate on the last one in the list.

if length(cffighnd)>1
      warning('More than one clustergram handle found.  Using most recent clustergram') 
      cffighnd = cffighnd(end);
end

It is now possible to modify the figure properties using the figure SET command.

Best Answer

Related Solutions

MATLAB: How to force execution of the ClickFcn callback of a Simulink annotation object every time I update the block diagram

MATLAB: How to modify the figure properties of a CLUSTERGRAM object in the BioInformatics Toolbox in MATLAB 7.6.0 (R2008a)

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