MATLAB: Find variable in Simulink blocks

findvarssimulink

In a Simulink model 'myModel', I would like to find all blocks that use the variable 'myVariable', even before the variable's value exists in the workspace. The variable appears in several constant blocks, which I want to highlight. But the following approach produces the error below. What am I doing wrong?

Simulink.findVars('myModel', 'Name', 'myVariable')

Model 'myModel' failed to successfully compile, any cached results may be incomplete.

Caused by: Error evaluating expression 't_total' for 'Stop time' specified in the Configuration Parameters dialog for block diagram 'myModel': Undefined function or variable 't_total'.

Best Answer

The particular error that you are seeing is about t_total being undefined, but in general, you do need to define all variables being used in the model (including 'myVariable'). Simulink attempts to compile the model (equivalent to Ctrl+D) in the algorithm used to find the variables, and Ctrl+D will fail if you have not defined the required variables.

Related Solutions

MATLAB: Find_system versus Simulink.findVars

Simulink.findVars returns a list of simulink.variableusage objects.

http://www.mathworks.com/help/simulink/slref/simulink.variableusageclass.html

This object has a "Source" property telling you where the variable comes form. Using that should allow you to only rename the variables you are looking for.

MATLAB: Removing all highlightning programmatically

There is no single function that can do this. You will need to use a collection of find_system and hilite_system to do this. Example below.

% Get highlighted blocks. Idea is to look for all blocks with yellow background (default highlight color). 
% This results in a cell array of paths to all blocks that satisfy this condition.
% Note that if your highlight color is different or more than one color, you would need to run an 
% appropriate or multiple commands to get the list of all blocks highlighted no matter what color.
hilited_blocks =  find_system('my_model','BackgroundColor','yellow')
% Pass block list to hilite_system to switch 'off' color.
hilite_system(hilited_blocks,'off')

Best Answer

Related Solutions

MATLAB: Find_system versus Simulink.findVars

MATLAB: Removing all highlightning programmatically

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