MATLAB: Does the ‘LoadFcn’ Callback of a commented block get executed

simulink

Why does the 'LoadFcn' Callback of a commented block get executed?

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We can classify the block callbacks in 2 categories: edit time and run time.

Edit time callbacks like the 'LoadFcn' callback need to execute even if the block is commented out. Just to display the commented block in the model, the block needs to be loaded, and the load callback is triggered. A similar behavior is observed with the 'DeleteFcn' and 'DestroyFcn' callbacks.

On the other hand, callbacks that are runtime (not needed for editing) like 'InitFcn' and 'StartFcn' are not triggered for commented out blocks and inactive variants.

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MATLAB: Using a ‘listbox’ in MATLAB R2015b, why do I receive the warning ‘Multiple-selection ‘listbox’ control requires that ‘Value’ be an integer within String range’

The error may be generated because the 'Value' property of the listbox is greater than the length of the cell array that is being assigned to the 'String' property. In other words, if the listbox has a 'Value' of 10, the cell array assigned to the 'String' property must have at least 10 elements.

To further demonstrate why the error might be occurring and to help with fixing the issue, consider the following code, which should run without errors in MATLAB R2015b:

>> MyString={'1','2','3','4','5'};
>> b=uicontrol('Style','listbox','Min',0,'Max',2,'Value',2);  % Value is less than the elements in 'MyString'
>> set(b,'String',MyString)

However, the following code will generate the error:

>> MyString={'1','2','3','4','5'};
>> b=uicontrol('Style','listbox','Min',0,'Max',2,'Value',10);  % Value is greater than the elements in 'MyString'
>> set(b,'String',MyString)

The difference between the two blocks of code above is that the second block of code has a 'Value' that is greater than the number of elements in the string.

MATLAB: Do I get errors when I try to use a Simulink block from Vehicle Network Toolbox 1.3 (R2010b) in a library

These errors are caused by a bug in the Vehicle Network Toolbox (VNT). This bug has been fixed as of VNT 2.0 (R2013a). For earlier releases, you can install the attached patch, 'privatevntslinitlib.m’, by using the following instructions:

1. Go into the following folder: "<matlabroot>\toolbox\vnt\vntblks\vntmasks\private\". Here, matlabroot refers to the MATLAB installation directory. The MATLABROOT command can be used at the MATLAB prompt to show its location.

2. Rename the existing ‘privatevntslinitlib.m’ file so that you can restore it in case something goes wrong.

3. Drop the attached ‘privatevntslinitlib.m’ file into the folder.

If you still observe errors, you can also install the attached patches for 'vntcansfcnstart.m', 'privatecansladdconfig.m', and 'privatevntsfcnfindconfig.m' by using the following instructions:

1. Rename the existing vntcansfcnstart.m file under the “<matlabroot>\toolbox\vnt\vntblks\vntmasks\” directory. Drop the new ‘vntcansfcnstart.m’ into this directory.

2. Rename the ‘privatecansladdconfig.m’ and ‘privatevntsfcnfindconfig.m’ files under the “<matlabroot>\toolbox\vnt\vntblks\vntmasks\private” directory. Drop the two attached files of the same name into this directory.

3. Restart MATLAB.

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Related Solutions

MATLAB: Using a ‘listbox’ in MATLAB R2015b, why do I receive the warning ‘Multiple-selection ‘listbox’ control requires that ‘Value’ be an integer within String range’

MATLAB: Do I get errors when I try to use a Simulink block from Vehicle Network Toolbox 1.3 (R2010b) in a library

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