Créer des objets à virgule fixe dans MATLAB

fi et numerictype pour la création de données à virgule fixe

Vous pouvez créer des données à virgule fixe à l’aide de l’objet Fixed-Point Designer™ fi. Dans le constructeur fi, vous pouvez spécifier les propriétés numerictype et fimath. Chaque objet fi a un objet numerictype associé. L’objet numerictype stocke les informations sur l’objet fi, telles que la longueur de mot, la longueur de la portion fractionnaire et le signe. L’objet numerictype est équivalent à l’objet fixdt dans Simulink^®.

Fonctions

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Construire des objets numériques à virgule fixe

`fi`	Construct fixed-point numeric object

Paramètres mathématiques à virgule fixe

`fimath`	Set fixed-point math settings
`fixed.fimathLike`	Return `fimath` object like the input (depuis R2022b)
`globalfimath`	Configure global fimath and return handle object
`removefimath`	Remove `fimath` from `fi` object
`removeglobalfimathpref`	Remove global fimath preference
`resetglobalfimath`	Set global fimath to MATLAB factory default
`setfimath`	Attach `fimath` object to `fi` object

Préférences de virgule fixe

`fipref`	Set fixed-point preferences
`savefipref`	Save `fi` preferences for next MATLAB session
`isfipref`	Determine whether input is `fipref` object

Propriétés des objets `fi`

`lowerbound`	Limite inférieure de la plage de l'objet `fi`
`lsb`	Scaling of least significant bit of `fi` object, or value of least significant bit of `quantizer` object
`range`	Numerical range of `fi` or `quantizer` object
`upperbound`	Upper bound of range of `fi` object
`sort`	Sort elements of real-valued `fi` object in ascending or descending order

Objets et propriétés

`fixed.aggregateType`	Compute aggregate numerictype
`get`	Property values of object
`isequal`	Determine whether real-world values of two `fi` objects are equal, or determine whether properties of two `fimath`, `numerictype`, or `quantizer` objects are equal
`isequaln`	Determine equality of fixed-point arrays, treating NaN values as equal (depuis R2021a)
`reset`	Reset objects to initial conditions
`set`	Set or display property values for `quantizer` objects
`mat2str`	Convert matrix to string
`tostring`	Convert `fi`, `fimath`, `numerictype`, or `quantizer` object to string

Classes

numerictype Construct an embedded.numerictype object describing fixed-point or floating-point data type

Rubriques

Construire des objets numériques à virgule fixe

Create Fixed-Point Data
This example shows the basics of how to use the fixed-point numeric object fi.
Visualisation des données à virgule fixe
Réglages de l’affichage des objets fi utilisés dans les exemples de code.
Ways to Construct fi Objects
Build fi object constructors in the command line or by using a GUI.
Set fi Object Properties
Tells you how to find more information about the properties associated with fi objects, and shows you how to set these properties.
Fixed-Point Versus Built-in Integer Types
Differences between fixed-point data types and built-in integer data types in MATLAB^®.

Paramètres mathématiques à virgule fixe

fimath Object Construction
Creation of fimath objects.
fimath Object Properties
Properties and property settings associated with fimath objects.
fimath Properties Usage for Fixed-Point Arithmetic
Fixed-point arithmetic using fimath objects to control the results.
fimath for Sharing Arithmetic Rules
Using a fimath object to share modular arithmetic information among multiple fi objects.
fimath for Rounding and Overflow Modes
Order setting for overflow action and rounding method.
fimath ProductMode and SumMode
Differences among the different settings of the ProductMode and SumMode properties.
How Functions Use fimath
Functions that ignore or discard fimath.

Préférences de virgule fixe

Set fi Object Display Preferences Using fipref
Examples of using fipref objects to set display preferences for fi objects.
Data Type Override Preferences Using fipref
Data type override using the fipref object.
Underflow and Overflow Logging Using fipref
Examples of using fipref objects to set logging preferences for fi objects.

Informations sur le type numérique

numerictype Object Construction
Construction of numerictype objects.
numerictype Object Properties
Properties and property settings associated with numerictype objects.
numerictype of Fixed-Point Objects
Fields and settings for the numerictype object.
numerictype Objects Usage to Share Data Type and Scaling Settings of fi objects
Example of using a numerictype object to share modular data type and scaling information among multiple fi objects.

Applications

Fixed-Point Design Exploration in Parallel
This example shows how to explore and test fixed-point designs by distributing tests across many computers in parallel.
Real-Time Image Acquisition, Image Processing, and Fixed-Point Blob Analysis for Target Practice Analysis
This example shows how to acquire real-time images from a GigE Vision® camera or webcam, process the images using fixed-point blob analysis, and determine world coordinates to score a laser pistol target.