Start Fixed-Point Tool
fxptdlg('modelname') starts the Fixed-Point
Tool for the Simulink® model specified by
You can also access this tool by the following methods:
From the Simulink Analysis menu, select Data Type Design > Fixed-Point Tool.
From a subsystem context (right-click) menu, select Fixed-Point Tool.
In conjunction with Fixed-Point Designer™ software, the Fixed-Point Tool provides convenient access to:
Model and subsystem parameters that control the signal logging, fixed-point instrumentation mode, and data type override. (see Model Parameters)
Plotting capabilities that enable you to plot data that resides in the MATLAB® workspace, namely, simulation results associated with Scope, To Workspace, and root-level Outport blocks, in addition to logged signal data (see Signal Logging)
An interactive automatic data typing feature that proposes fixed-point data types for appropriately configured objects in your model, and then allows you to selectively accept and apply the data type proposals
You can launch the Fixed-Point Tool for any system or subsystem, and the tool controls the object selected in its System under design pane. If Fixed-Point Designer software is installed, the Fixed-Point Tool displays the name, data type, design minimum and maximum values, minimum and maximum simulation values, and scaling of each model object that logs fixed-point data. Additionally, if a signal saturates or overflows, the tool displays the number of times saturation or overflow occurred.
If your model uses accelerator or rapid accelerator simulation modes, the Fixed-Point Tool changes the simulation mode to normal during range collection, and then sets it back to its original simulation mode once the range collection simulation is complete.
Most of the functionality in the Fixed-Point Tool is for use with the Fixed-Point Designer software. However, even if you do not have Fixed-Point Designer software, you can configure data type override settings to simulate a model that specifies fixed-point data types. In this mode, the Simulink software temporarily overrides fixed-point data types with floating-point data types when simulating the model.
If you use fi objects or embedded numeric data types in your model or workspace, you might introduce fixed-point data types into your model. You can set fipref to prevent the checkout of a Fixed-Point Designer license.
To simulate a model without using Fixed-Point Designer:
Enter the following at the command line.
set_param(gcs, 'DataTypeOverride', 'Double',... 'DataTypeOverrideAppliesTo','AllNumericTypes',... 'MinMaxOverflowLogging','ForceOff')
If you use
fi objects or embedded numeric data types in
your model, set the
DataTypeOverride property to
TrueSingles (to be
consistent with the model-wide data type override setting) and the
DataTypeOverrideAppliesTo property to
For example, at the MATLAB command line, enter:
p = fipref('DataTypeOverride', 'TrueDoubles', ... 'DataTypeOverrideAppliesTo', 'AllNumericTypes');