在 MATLAB 中创建定点对象

使用 fi 和 numerictype 创建定点数据

您可以使用 Fixed-Point Designer™ fi 对象创建定点数据。在 fi 构造函数中，您可以指定 numerictype 和 fimath 属性。每个 fi 对象都有关联的 numerictype 对象。numerictype 对象存储关于 fi 对象的信息，包括字长、小数长度和符号性。numerictype 对象相当于 Simulink^® 中的 fixdt 对象。

函数

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构造定点数值对象

fi 构造定点数值对象

定点数学设置

`fimath`	设置定点数学设置
`fixed.fimathLike`	Return `fimath` object like the input (自 R2022b 起)
`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

定点预设项

`fipref`	Set fixed-point preferences
`savefipref`	保存 `fi` 预设项以用于下一个 MATLAB 会话
`isfipref`	确定输入是否为 `fipref` 对象

`fi` 对象的属性

`lowerbound`	`fi` 对象范围的下界
`lsb`	`fi` 对象的最低有效位的定标，或 `quantizer` 对象的最低有效位的值
`range`	`fi` 或 `quantizer` 对象的数值范围
`upperbound`	`fi` 对象范围的上界
`sort`	按升序或降序对实数值 `fi` 对象的元素进行排序

对象和属性

`fixed.aggregateType`	Compute aggregate numerictype
`get`	对象的属性值
`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 (自 R2021a 起)
`reset`	将对象重置为初始条件
`set`	设置或显示 `quantizer` 对象的属性值
`mat2str`	将矩阵转换为字符串
`tostring`	将 `fi`、`fimath`、`numerictype` 或 `quantizer` 对象转换为字符串

类

numerictype 构造描述定点或浮点数据类型的 embedded.numerictype 对象

主题

构造定点数值对象

创建定点数据
此示例说明如何使用定点数值对象 fi 的基础知识。
查看定点数据
使用 fipref 控制定点数据属性的显示。
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.
定点数据类型与内置整数类型
MATLAB^® 中定点数据类型与内置整数数据类型的区别。

定点数学设置

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.
用于舍入和溢出模式的 fimath
溢出操作和舍入方法的顺序设置。
fimath ProductMode and SumMode
Differences among the different settings of the ProductMode and SumMode properties.
函数如何使用 fimath
忽略或丢弃 fimath 的函数。

定点预设项

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.

数值类型信息

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.

应用领域

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.