Fixed-Point Support for MATLAB System Objects
Getting Information About Fixed-Point System Objects
System objects that support fixed-point data processing have
fixed-point properties. When you display the properties of a System object™,
Show all properties at the end of the property
list to display the fixed-point properties for that object. You can
also display the fixed-point properties for a particular object by
the command line.
The following Computer Vision Toolbox™ objects support fixed-point data processing.
Setting System Object Fixed-Point Properties
Several properties affect the fixed-point data processing used by a System object. Objects perform fixed-point processing and use the current fixed-point property settings when they receive fixed-point input.
You change the values of fixed-point properties in the same
way as you change any System object property value. You also use the Fixed-Point Designer™
numerictype (Fixed-Point Designer) object to specify the
desired data type as fixed point, the signedness, and the word- and
In the same way as for blocks, the data type properties of many
System objects can set the appropriate word lengths and scalings automatically
by using full precision. System objects assume that the target specified
on the Configuration Parameters Hardware Implementation target is
If you have not set the property that activates a dependent property and you attempt to change that dependent property, you will get a warning message.
You must set the property that activates a dependent property before attempting to change the dependent property. If you do not set the activating property, you will get a warning message.
System objects do not support fixed-point word lengths greater than 128 bits.
For any System object provided in the Toolbox, the fimath settings for any fimath attached to a fi input or a fi property are ignored. Outputs from a System object never have an attached fimath.