find_mdlrefs

Find referenced models and Model blocks in model hierarchy

Syntax

[models,blocks]
= find_mdlrefs(system)

[models,blocks]
= find_mdlrefs(system,Name,Value)

Description

[models,blocks] = find_mdlrefs(system) finds all referenced models and Model blocks in the model hierarchy below the specified system. The find_mdlrefs function temporarily loads the models.

example

[models,blocks] = find_mdlrefs(system,Name,Value) provides additional search options using one or more name-value pairs. For example, to keep the models loaded instead of temporarily loading them, set KeepModelsLoaded to true.

example

Examples

collapse all

Find Referenced Models in Model Hierarchy

Open Live Script

Find referenced models and Model blocks for all models referenced by the specified model.

load_system('sldemo_mdlref_basic');
[myModels,myModelBlks] = find_mdlrefs('sldemo_mdlref_basic')

myModels = 2x1 cell
    {'sldemo_mdlref_counter'}
    {'sldemo_mdlref_basic'  }

myModelBlks = 3x1 cell
    {'sldemo_mdlref_basic/CounterA'}
    {'sldemo_mdlref_basic/CounterB'}
    {'sldemo_mdlref_basic/CounterC'}

Find and Load All Models in Model Hierarchy

Open Live Script

By default, the find_mdlrefs function loads and then closes the models that were not already loaded.

Open the project that contains the sldemo_mdlref_depgraph model.

openProject('ModelReferenceHierarchy');

This project opens the sldemo_mdlref_depgraph model.

To identify the loaded models, use the find_system function.

find_system('type','block_diagram')

ans = 2x1 cell
    {'simulink_extras'       }
    {'sldemo_mdlref_depgraph'}

To find all the models in the model hierarchy, use the find_mdlrefs function.

find_mdlrefs('sldemo_mdlref_depgraph')

ans = 7x1 cell
    {'sldemo_mdlref_heat2cost'   }
    {'sldemo_mdlref_house'       }
    {'sldemo_mdlref_F2C'         }
    {'sldemo_mdlref_outdoor_temp'}
    {'sldemo_mdlref_thermostat'  }
    {'sldemo_mdlref_heater'      }
    {'sldemo_mdlref_depgraph'    }

To identify the models that remain loaded, use the find_system function.

find_system('type','block_diagram')

ans = 2x1 cell
    {'simulink_extras'       }
    {'sldemo_mdlref_depgraph'}

Only the previously loaded models remain loaded.

To find and load all models in the model hierarchy, use the find_mdlrefs function, and set KeepModelsLoaded to true.

find_mdlrefs('sldemo_mdlref_depgraph','KeepModelsLoaded',true);
find_system('type','block_diagram')

ans = 8x1 cell
    {'sldemo_mdlref_thermostat'  }
    {'sldemo_mdlref_heater'      }
    {'sldemo_mdlref_F2C'         }
    {'sldemo_mdlref_outdoor_temp'}
    {'sldemo_mdlref_house'       }
    {'sldemo_mdlref_heat2cost'   }
    {'simulink_extras'           }
    {'sldemo_mdlref_depgraph'    }

The top model and all referenced models remain loaded. With all the referenced models loaded, you can navigate the model hierarchy without waiting for each referenced model to load as you open it.

Filter Referenced Model Search Using Custom Functions

Open Live Script

Use the MatchFilter argument with a custom filter function to find all Model blocks for which the InitFcn callback is defined.

The custom function is defined in the file initFcnMdlBlocks.m.

function match = initFcnMdlBlocks(handle)
  match = ~isempty(get_param(handle,'InitFcn'));
end

Provide the function handle as the value of the MatchFilter argument.

load_system('slexVariantMdlRefCondProp');
[models,blocks] = find_mdlrefs('slexVariantMdlRefCondProp','MatchFilter',@initFcnMdlBlocks);

Filter Referenced Model Search Using Built-In Filter Functions for Variants

Open Live Script

Simulink.match.activeVariants

Find variant blocks that are active in simulation after model compilation.

model1='slexVariantMdlRefCondProp';
load_system(model1);
set_param(model1,'SimulationCommand','update');
[models,blocks] = find_mdlrefs(model1,'MatchFilter',@Simulink.match.activeVariants);

Simulink.match.codeCompileVariants

Find variant choices that are part of the generated C code after model compilation.

assignin('base','VSS_MODE',2);
slexVariantMdlRefCondProp([],[],[],'compileForCodegen');

### Searching for referenced models in model 'slexVariantMdlRefCondProp'.
### Found 2 model reference targets to update.
### Starting serial model reference code generation build.
### Starting build procedure for: slexVariantMdlRefCondProp_sub1
### Successful completion of build procedure for: slexVariantMdlRefCondProp_sub1
### Starting build procedure for: slexVariantMdlRefCondProp_sub2
### Successful completion of build procedure for: slexVariantMdlRefCondProp_sub2

Build Summary

Model reference code generation targets:

Model                           Build Reason                                              Status                        Build Duration
======================================================================================================================================
slexVariantMdlRefCondProp_sub1  Target (slexVariantMdlRefCondProp_sub1.c) did not exist.  Code generated and compiled.  0h 0m 23.522s 
slexVariantMdlRefCondProp_sub2  Target (slexVariantMdlRefCondProp_sub2.c) did not exist.  Code generated and compiled.  0h 0m 11.164s 

2 of 2 models built (0 models already up to date)
Build duration: 0h 0m 40.23s

[models,blocks] = find_mdlrefs(model1,...
                               'MatchFilter',@Simulink.match.codeCompileVariants);
slexVariantMdlRefCondProp([],[],[],'term');

Simulink.match.allVariants

Find all blocks irrespective of whether the block is active or inactive due to variants.

[models,blocks] = find_mdlrefs(model1,'MatchFilter',@Simulink.match.allVariants);

Simulink.match.legacy.filterOutCodeInactiveVariantSubsystemChoices

Find Variant Subsystem choice blocks that are active in simulation or part of generated code at edit-time. For information on the limitations of edit-time filters, see MatchFilter.

model2='sldemo_mdlref_variants';
load_system(model2);
[models,blocks] = find_mdlrefs(model2, ...
   'MatchFilter',@Simulink.match.legacy.filterOutCodeInactiveVariantSubsystemChoices)

Simulink.match.legacy.filterOutInactiveVariantSubsystemChoices

Find active Variant Subsystem choice blocks at edit-time. For information on the limitations of edit-time filters, see MatchFilter.

[models,blocks] = find_mdlrefs(model2, ...
   'MatchFilter',@Simulink.match.legacy.filterOutInactiveVariantSubsystemChoices)

Input Arguments

collapse all

`system` — System name, block path, or handle
character vector | string scalar | numeric scalar

System name, block path, or handle, specified as a character vector, string scalar, or numeric scalar.

The system must be an SLX file, MDL file, Model block, or Subsystem block.

If you specify a file name, do not include the file extension.

Data Types: double | char | string

Name-Value Arguments

Specify optional pairs of arguments as Name1=Value1,...,NameN=ValueN, where Name is the argument name and Value is the corresponding value. Name-value arguments must appear after other arguments, but the order of the pairs does not matter.

Before R2021a, use commas to separate each name and value, and enclose Name in quotes.

Example: refModels = find_mdlrefs(topmodel,'KeepModelsLoaded',true,'ReturnTopModelAsLastElement',false)

`KeepModelsLoaded` — Option to keep models loaded
`false` or `0` (default) | `true` or `1`

Option to keep models loaded, specified as the comma-separated pair consisting of 'KeepModelsLoaded' and a numeric or logical 1 (true) or 0 (false).

By default the function loads and then closes the models that were not already loaded. To keep the models loaded, set this argument to true. Keeping the models loaded can be useful if you plan on interacting with the models after finding them.

Data Types: logical

`AllLevels` — Levels to search
`true` or `1` (default) | `false` or `0`

Levels to search, specified as the comma-separated pair consisting of 'AllLevels' and a numeric or logical 1 (true) or 0 (false).

true — Search all Model blocks in the model hierarchy of the specified system.
false — Search only the top-level system.

Data Types: logical

`IncludeProtectedModels` — Option to include protected models
`false` or `0` (default) | `true` or `1`

Option to include protected models in the search results, specified as the comma-separated pair consisting of 'IncludeProtectedModels' and a numeric or logical 1 (true) or 0 (false).

This setting only affects the returned list of referenced models; It does not affect the returned list of Model blocks.

Data Types: logical

`IncludeCommented` — Option to include commented blocks
`false` or `0` (default) | `true` or `1`

Option to include commented blocks in the search results, specified as the comma-separated pair consisting of 'IncludeCommented' and a numeric or logical 1 (true) or 0 (false).

Data Types: logical

`CaseSensitive` — Option to match case when searching
`true` (default) | `false`

Option to match case when searching, specified as true for case-sensitive search or false for case-insensitive search.

Data Types: logical

`FollowLinks` — Option for search to follow library links
`true` (default) | `false`

Option for the search to follow library links, specified as true or false. If true, search follows links into library blocks.

Data Types: logical

`LookUnderMasks` — Options to search masked blocks
`'all'` (default) | `'none'` | `'functional'` | `'graphical'`

Options to search masked blocks, specified as:

'all' — Search in all masked blocks.
'none' — Prevent searching in masked systems.
'functional' — Include masked subsystems that do not have dialogs.
'graphical' — Include masked subsystems that do not have workspaces or dialogs.

Data Types: char | string

`MatchFilter` — Option to match and filter elements in search
function handle

Option to match and filter elements such as blocks, system, lines, ports, and annotations in a search, specified as function handle. Use MatchFilter to determine whether elements should be included or skipped in the search.

The argument:

Allows you to filter elements with custom filter functions
Avoids processing elements when filters do not match
Applies complex filters on blocks, lines, or annotations, to filter the results internally

The named function must be defined within a MATLAB^® program file. The function takes the handle of the element as input and returns two outputs.

 function [match, prune] = func(element)

The input element is the handle of the block being processed.
The first output, match, is a logical value. If false, search skips the element.
The second output, prune, is an optional logical value that only applies when element is a subsystem. The default value is false. If this value is set to true, the entire subsystem is omitted from the search.

Variants: Simulink^® provides these built-in match filter functions to find variant blocks.

Post-compile time filter functions:

Simulink.match.activeVariants — Filter function to find blocks that are active in simulation after model compilation.
Simulink.match.codeCompileVariants — Filter function to find blocks that are part of generated code after model compilation.
Simulink.match.allVariants — Filter function to find all blocks irrespective of whether the block is active or inactive due to variants.

Note

To get correct results, you must compile the model before using Simulink.match.activeVariants and Simulink.match.codeCompileVariants filters. If the model is not compiled, these filters return all blocks in the model. For an example that compares the pre-compile and post-compile time results for these filters, see Compare Pre-Compile and Post-Compile Behavior of Match Filters for Variant Blocks.

Edit-time filter functions for Variant Subsystem blocks:

Simulink.match.legacy.filterOutCodeInactiveVariantSubsystemChoices — Filter function to find Variant Subsystem choice blocks that are active in simulation or part of generated code. This function produces similar results as the 'ActivePlusCodeVariants' option of the Variants argument.
Simulink.match.legacy.filterOutInactiveVariantSubsystemChoices — Filter function to find active Variant Subsystem choice blocks. This function produces similar results as the 'ActiveVariants' option of the Variants argument.

Limitations of edit-time filters:

The filters do not use the post-compile block activeness information in the CompiledVariantInfo block parameter.
The filters apply only to Variant Subsystem blocks that have these block parameter settings:
- Variant control mode set to expression or label
- Propagate conditions outside of variant subsystem set to off
The filters can identify if a block handle is inside the active choice of a Variant Subsystem only when used within the context of find_system, find_mdlrefs, and Simulink.FindOptions.

To operate on all types of variant blocks, use the Simulink.match.codeCompileVariants or Simulink.match.activeVariants filters after model compilation.

`Variants` — Option to include variant models
`'ActivePlusCodeVariants'` (default) | `'ActiveVariants'` | `'AllVariants'`

Note

The Variants argument will be removed. Use MatchFilter instead. For more information, see Version History.

Option to include variant models in the search results, specified as the comma-separated pair consisting of 'Variants' and 'ActivePlusCodeVariants', 'ActiveVariants', or 'AllVariants'.

'ActivePlusCodeVariants' — Include all variant models in the Variant Subsystem that are active in simulation and is part of the generated code.
'ActiveVariants' — Include the active variant models in the Variant Subsystem block.
'AllVariants' — Include all variant models in the Variant Subsystem block.

This search constraint applies only to Variant Subsystem blocks that have the Variant control mode set to expression or label. Use the find_mdlrefs function with the MatchFilter option to operate on all types of variant blocks.

Data Types: char | string

`ReturnTopModelAsLastElement` — Option to include specified system
`true` or `1` (default) | `false` or `0`

Option to include the specified system in the search results, specified as the comma-separated pair consisting of 'ReturnTopModelAsLastElement' and a numeric or logical 1 (true) or 0 (false).

By default, the last element in the returned list of referenced models is the name of the model, library, or subsystem file that you specified with the system argument. If you specify a block, the last element is the name of the file that contains it.

Data Types: logical

Output Arguments

collapse all

`models` — Names of models
cell array of character vectors

Names of models, returned as a cell array of character vectors.

By default, the last element is the name of the model, library, or subsystem file that you specified with the system argument. If you specify a block, the last element is the model, library, or subsystem file that contains it.

`blocks` — Names of Model blocks
cell array of character vectors

Names of Model blocks, returned as a cell array of character vectors.

Version History

Introduced before R2006a

expand all

R2022b: Warnings for removal of `Variants` argument

As part of the removal of the Variants argument in a future release, these warnings have been introduced:

When you use the find_mdlrefs function without the Variants argument, the function generates a warning if it skips the inactive choice of a Variant Subsystem block during the search.

Consider a model with a Variant Model block that has two variant choices, Mdl_Linear_Controller and Mdl_NonLinear_Controller. The Mdl_NonLinear_Controller block is the active choice.

This command skips the inactive Mdl_Linear_Controller block and generates a warning.

[myModels,myModelBlks] = find_mdlrefs...
('sldemo_variant_subsystems_modelblocks')

Warning: Using find_mdlrefs without the 'Variants' argument skips inactive Variant Subsystem 
blocks in the search. This behavior will change in a future release to look at all choices of 
the Variant Subsystem. To find blocks that are active in simulation or code generation, compile
the model and use the built-in variant filters with the 'MatchFilter' option. 

myModels =

  2×1 cell array

    {'mdlref_nonlinear_controller'          }
    {'sldemo_variant_subsystems_modelblocks'}


myModelBlks =

  1×1 cell array

    {'sldemo_variant_subsystems_modelblocks/Controller/Mdl_NonLinear_Controller'}

When you use the Variants argument with its value set to 'AllVariants', the function generates a warning.

[myModels,myModelBlks] = find_mdlrefs...
('sldemo_variant_subsystems_modelblocks','Variants','AllVariants')

Warning: 'Variants' will be removed. Instead of using 'Variants' with value set 
to 'AllVariants', use 'MatchFilter' with value set to @Simulink.match.allVariants.

myModels =

  3×1 cell array

    {'Linear_Controller'                    }
    {'Nonlinear_Controller'                 }
    {'sldemo_variant_subsystems_modelblocks'}


myModelBlks =

  2×1 cell array

    {'sldemo_variant_subsystems_modelblocks/Controller/Linear Controller'   }
    {'sldemo_variant_subsystems_modelblocks/Controller/Nonlinear Controller'}

R2022a: New built-in match filter to find all variant blocks

You can use the built-in match filter, Simulink.match.allVariants, to find all the blocks in a variant model regardless of whether the block is active or inactive due to variants. This filter is the recommended replacement for the AllVariants option.

To be removed	Recommended Replacement
find_mdlrefs(model,'Variants','AllVariants');	find_mdlrefs(model,'MatchFilter', ... @Simulink.match.allVariants);

R2021a: Default behavior has changed for `Variants` and `MatchFilter` arguments in model with variant blocks

Variants: When you use the find_mdlrefs function without the Variants argument, for Variant Subsystem blocks, the function currently includes only those choices that are active during simulation or code generation in the search by default.
For other variant blocks such as Variant Source, Variant Sink, or Variant Subsystem blocks with the Propagate conditions outside of variant subsystem parameter set to on, the function includes all choices in the search.
Consider a model with a Variant Model block that has two variant choices, Mdl_Linear_Controller and Mdl_NonLinear_Controller.
This command returns only the active Model blocks in the model.
```
[myModels,myModelBlks] = find_mdlrefs...
('sldemo_variant_subsystems_modelblocks')
```
```
myModels =

  2×1 cell array

    {'mdlref_nonlinear_controller'          }
    {'sldemo_variant_subsystems_modelblocks'}


myModelBlks =

  1×1 cell array

    {'sldemo_variant_subsystems_modelblocks/Controller/Mdl_NonLinear_Controller'}
```

MatchFilter: When you use the find_mdlrefs function with the MatchFilter argument, the function applies the filters on the active and inactive variant choices by default.

Consider a model with a Variant Model block that has two variant choices, Mdl_Linear_ Controller and Mdl_NonLinear_Controller. The filter function initFcnMdlBlocks finds all the Model blocks for which the InitFcn callback is set.

 function match = initFcnMdlBlocks(handle)
 match = ~isempty(get_param(handle, 'InitFcn'));
 end

This command returns the active and inactive Model blocks in the model.

[myModels,myModelBlks] = find_mdlrefs('sldemo_variant_subsystems_modelblocks',...
 'MatchFilter', @initFcnMdlBlocks)

myModels =

  3×1 cell array

    {'mdlref_linear_controller'             }
    {'mdlref_nonlinear_controller'          }
    {'sldemo_variant_subsystems_modelblocks'}


myModelBlks =

  2×1 cell array

    {'sldemo_variant_subsystems_modelblocks/Controller/Mdl_Linear_Controller'   }
    {'sldemo_variant_subsystems_modelblocks/Controller/Mdl_NonLinear_Controller'}

R2021a: `Variants` argument will be removed

The Variants argument will be removed from find_mdlrefs in a future release. Function calls that use the Variants argument continue to work with a warning.

Using the find_mdlrefs function with the Variants argument produces inconsistent search results. The find_mdlrefs function is an edit-time operation, but to determine whether a block is active in a model with all types of variant blocks, you need to compile the model.

To find Model blocks that are active during simulation or code generation, compile the model and use the find_mdlrefs function with the MatchFilter argument.

This table lists the recommended replacement for different values of the Variants argument.

To Be Removed	Recommended Replacement
find_mdlrefs(model,'Variants', ... 'ActiveVariants');	set_param(model,'SimulationCommand','update'); find_mdlrefs(model,'MatchFilter', ... @Simulink.match.activeVariants);
find_mdlrefs(model,'Variants', ... 'ActivePlusCodeVariants');	model([],[],[],'compileForCodegen'); [models,blocks] = find_mdlrefs(model,'MatchFilter', ... @Simulink.match.codeCompileVariants); model([],[],[],'term');

To Be Removed

Recommended Replacement

find_mdlrefs(model,'Variants', ...
'ActiveVariants');

set_param(model,'SimulationCommand','update');
find_mdlrefs(model,'MatchFilter', ...
@Simulink.match.activeVariants);

find_mdlrefs(model,'Variants', ...
'ActivePlusCodeVariants');

model([],[],[],'compileForCodegen');
[models,blocks] = find_mdlrefs(model,'MatchFilter', ...
@Simulink.match.codeCompileVariants);
model([],[],[],'term');

When you use the find_system function, you cannot specify both of the MatchFilter and Variants arguments.

This command produces an error.

find_mdlrefs(bdroot,'MatchFilter',@Simulink.match.activeVariants,...
    'Variants','ActiveVariants');

R2020b: Filter elements during search with `MatchFilter`

To match and filter model elements during a search, you can define a custom filter function and pass the function handle as value to the MatchFilter name-value argument.

To find variant blocks that are active in a simulation or part of the generated code, you can use the built-in match filter functions, Simulink.match.activeVariants, Simulink.match.codeCompileVariants, and Simulink.match.allVariants, after compiling the model.

R2020b: Specifying a logical value as the second argument of `find_mdlrefs` is discouraged

The find_mdlrefs function provides two ways to specify whether to search all levels of the model hierarchy. Both techniques give the same results, but only the name-value pair technique allows you to specify additional options.

Instead of specifying whether to search all levels of the model hierarchy with a logical as the second argument, use the AllLevels name-value pair.

find_mdlrefs

Syntax

Description

Examples

Find Referenced Models in Model Hierarchy

Find and Load All Models in Model Hierarchy

Filter Referenced Model Search Using Custom Functions

Filter Referenced Model Search Using Built-In Filter Functions for Variants

Input Arguments

`system` — System name, block path, or handle
character vector | string scalar | numeric scalar

Name-Value Arguments

`KeepModelsLoaded` — Option to keep models loaded
`false` or `0` (default) | `true` or `1`

`AllLevels` — Levels to search
`true` or `1` (default) | `false` or `0`

`IncludeProtectedModels` — Option to include protected models
`false` or `0` (default) | `true` or `1`

`IncludeCommented` — Option to include commented blocks
`false` or `0` (default) | `true` or `1`

`CaseSensitive` — Option to match case when searching
`true` (default) | `false`

`FollowLinks` — Option for search to follow library links
`true` (default) | `false`

`LookUnderMasks` — Options to search masked blocks
`'all'` (default) | `'none'` | `'functional'` | `'graphical'`

`MatchFilter` — Option to match and filter elements in search
function handle

`Variants` — Option to include variant models
`'ActivePlusCodeVariants'` (default) | `'ActiveVariants'` | `'AllVariants'`

`ReturnTopModelAsLastElement` — Option to include specified system
`true` or `1` (default) | `false` or `0`

Output Arguments

`models` — Names of models
cell array of character vectors

`blocks` — Names of Model blocks
cell array of character vectors

Version History

R2022b: Warnings for removal of `Variants` argument

R2022a: New built-in match filter to find all variant blocks

R2021a: Default behavior has changed for `Variants` and `MatchFilter` arguments in model with variant blocks

R2021a: `Variants` argument will be removed

R2020b: Filter elements during search with `MatchFilter`

R2020b: Specifying a logical value as the second argument of `find_mdlrefs` is discouraged

See Also

Blocks

Functions

Topics

find_mdlrefs

Syntax

Description

Examples

Find Referenced Models in Model Hierarchy

Find and Load All Models in Model Hierarchy

Filter Referenced Model Search Using Custom Functions

Filter Referenced Model Search Using Built-In Filter Functions for Variants

Input Arguments

system — System name, block path, or handle character vector | string scalar | numeric scalar

Name-Value Arguments

KeepModelsLoaded — Option to keep models loaded false or 0 (default) | true or 1

AllLevels — Levels to search true or 1 (default) | false or 0

IncludeProtectedModels — Option to include protected models false or 0 (default) | true or 1

IncludeCommented — Option to include commented blocks false or 0 (default) | true or 1

CaseSensitive — Option to match case when searching true (default) | false

FollowLinks — Option for search to follow library links true (default) | false

LookUnderMasks — Options to search masked blocks 'all' (default) | 'none' | 'functional' | 'graphical'

MatchFilter — Option to match and filter elements in search function handle

Variants — Option to include variant models 'ActivePlusCodeVariants' (default) | 'ActiveVariants' | 'AllVariants'

ReturnTopModelAsLastElement — Option to include specified system true or 1 (default) | false or 0

Output Arguments

models — Names of models cell array of character vectors

blocks — Names of Model blocks cell array of character vectors

Version History

R2022b: Warnings for removal of Variants argument

R2022a: New built-in match filter to find all variant blocks

R2021a: Default behavior has changed for Variants and MatchFilter arguments in model with variant blocks

R2021a: Variants argument will be removed

R2020b: Filter elements during search with MatchFilter

R2020b: Specifying a logical value as the second argument of find_mdlrefs is discouraged

See Also

Blocks

Functions

Topics

`system` — System name, block path, or handle
character vector | string scalar | numeric scalar

`KeepModelsLoaded` — Option to keep models loaded
`false` or `0` (default) | `true` or `1`

`AllLevels` — Levels to search
`true` or `1` (default) | `false` or `0`

`IncludeProtectedModels` — Option to include protected models
`false` or `0` (default) | `true` or `1`

`IncludeCommented` — Option to include commented blocks
`false` or `0` (default) | `true` or `1`

`CaseSensitive` — Option to match case when searching
`true` (default) | `false`

`FollowLinks` — Option for search to follow library links
`true` (default) | `false`

`LookUnderMasks` — Options to search masked blocks
`'all'` (default) | `'none'` | `'functional'` | `'graphical'`

`MatchFilter` — Option to match and filter elements in search
function handle

`Variants` — Option to include variant models
`'ActivePlusCodeVariants'` (default) | `'ActiveVariants'` | `'AllVariants'`

`ReturnTopModelAsLastElement` — Option to include specified system
`true` or `1` (default) | `false` or `0`

`models` — Names of models
cell array of character vectors

`blocks` — Names of Model blocks
cell array of character vectors

R2022b: Warnings for removal of `Variants` argument

R2021a: Default behavior has changed for `Variants` and `MatchFilter` arguments in model with variant blocks

R2021a: `Variants` argument will be removed

R2020b: Filter elements during search with `MatchFilter`

R2020b: Specifying a logical value as the second argument of `find_mdlrefs` is discouraged