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Fixed-Point Tool

Introduction to the Fixed-Point Tool

The Fixed-Point Tool is a graphical user interface that automates specifying fixed-point data types in a model. The tool collects range data for model objects. The range data comes from either design minimum and maximum values that objects specify explicitly, from logged minimum and maximum values that occur during simulation, or from minimum and maximum values derived using range analysis. Based on these values, the tool proposes fixed-point data types that maximize precision and cover the range. With this too, you can review the data type proposals and then apply them selectively to objects in your model.

Fixed-Point Tool CapabilityMore Information

Deriving range information based on specified design range

Derive Ranges

Proposing data types based on simulation data

Autoscaling Using the Fixed-Point Tool

Proposing data types based on derived ranges

Autoscaling Using the Fixed-Point Tool

Proposing data types based on simulation data from multiple runs

Propose Data Types Using Multiple Simulations

Debugging fixed-point models

Debug a Fixed-Point Model

Using the Fixed-Point Tool

To open the Fixed-Point Tool, use any of the following methods:

  • From the Simulink® Analysis menu, select Data Type Design > Fixed-Point Tool.

  • From the model context menu, select Fixed-Point Tool.

  • From a subsystem context menu, select Fixed-Point Tool.

If you want to open the tool programmatically, use the fxptdlg function. For more information, see fxptdlg.

The Fixed-Point Tool contains the following components:

  • Model Hierarchy pane — Displays a tree-structured view of the Simulink model hierarchy.

  • Contents pane — Displays a tabular view of objects that log fixed-point data in a system or subsystem.

  • Workflow tab — Displays parameters for specifying particular attributes of a system or subsystem, such as its data type override and fixed-point instrumentation mode.

  • Toolbar — Provides buttons for commonly used Fixed-Point Tool commands.

  • Advanced Settings dialog— To open the Advanced Settings dialog far right-hand pane, under Configure model settings click the Advanced settings link. This editor provides the ability to configure shortcuts that set up the run name as well as model-wide data type override and instrumentation settings prior to simulation or range derivation. For more information, see Run Management with the Shortcut Editor.

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