Documentation

linqueryIsZero

Query object for finding blocks that linearize to zero

Description

linqueryIsZero creates a custom query object for finding all the blocks in a linearization result that linearize to zero.

When you linearize a Simulink® model, you can create a LinearizationAdvisor object that contains diagnostic information about individual block linearizations. To find block linearizations that satisfy specific criteria, you can use the find function with custom query objects. Alternatively, you can analyze linearization diagnostics using the Linearization Advisor in the Linear Analysis Tool. For more information on finding specific blocks in linearization results, see Find Blocks in Linearization Results Matching Specific Criteria.

Creation

Syntax

query = linqueryIsZero

Description

example

query = linqueryIsZero creates a query object for finding all the blocks in a LinearizationAdvisor object that linearize to zero.

Properties

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Query type, specified as 'Linearized to Zero'.

Query description, specified as 'Blocks Linearized to Zero'. You can add your own description to the query object using this property.

Usage

After creating a linqueryIsZero query object, you can:

  • Find all the blocks in a LinearizationAdvisor object that linearize to zero by using the linqueryIsZero query directly with the find command.

  • Create a CompoundQuery object by logically combining the linqueryIsZero query with other query objects.

Object Functions

findFind blocks in linearization results that match specific criteria

Examples

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Load the Simulink model.

mdl = 'scdpendulum';
load_system(mdl)

Linearize the model and obtain the LinearizationAdvisor object.

opts = linearizeOptions('StoreAdvisor',true);
io = getlinio(mdl);
[sys,op,info] = linearize(mdl,io,opts);
advisor = info.Advisor;

Create query object, and find all blocks that linearize to zero.

qZero = linqueryIsZero;
advZero = find(advisor,qZero)
advZero = 
  LinearizationAdvisor with properties:

               Model: 'scdpendulum'
      OperatingPoint: [1x1 opcond.OperatingPoint]
    BlockDiagnostics: [1x3 linearize.advisor.BlockDiagnostic]
           QueryType: 'Linearized to Zero'

Alternative Functionality

App

You can also create custom queries for finding specific blocks in linearization results using the Linearization Advisor in the Linear Analysis Tool. For more information, see Find Blocks in Linearization Results Matching Specific Criteria.

Introduced in R2017b

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