2024年4月7日发(作者：)

matlab 定点乘法

英文回答：

Matlab provides a built-in function for fixed-point

multiplication, which allows us to perform multiplication

operations on fixed-point numbers. The function is called

"fi" and it is part of the Fixed-Point Designer toolbox in

Matlab.

To perform fixed-point multiplication using Matlab, we

first need to define the fixed-point numbers that we want

to multiply. We can do this by creating a fixed-point

object using the "fi" function. The fixed-point object

includes information about the word length, fraction length,

and other properties of the fixed-point number.

Once we have defined the fixed-point numbers, we can

simply use the "" operator to perform the multiplication

operation. Matlab will automatically handle the fixed-point

arithmetic and provide the result as a fixed-point number.

Here is an example to illustrate how to perform fixed-

point multiplication in Matlab:

matlab.

% Define the fixed-point numbers.

a = fi(0.5, 1, 8, 7); % 1-bit sign, 8-bit word length,

7-bit fraction length.

b = fi(0.25, 1, 8, 7);

% Perform fixed-point multiplication.

result = a b;

% Display the result.

disp(result);

In this example, we define two fixed-point numbers `a`

and `b` with a word length of 8 bits and a fraction length

of 7 bits. We then perform the multiplication operation

using the "" operator and store the result in the `result`

variable. Finally, we display the result using the `disp`

function.

The output of this example will be the fixed-point

number `0.125` with a word length of 8 bits and a fraction

length of 7 bits.

中文回答：

Matlab提供了一个内置函数用于定点乘法，可以在定点数上执

行乘法运算。该函数称为"fi"，它是Matlab中的Fixed-Point

Designer工具箱的一部分。

要使用Matlab进行定点乘法，首先需要定义要相乘的定点数。

我们可以使用"fi"函数创建一个定点对象来完成这个任务。定点对

象包括有关定点数的字长、小数位数和其他属性的信息。

一旦我们定义了定点数，我们可以简单地使用""运算符执行乘

法操作。Matlab会自动处理定点算术，并将结果作为定点数提供。

下面是一个示例，说明如何在Matlab中执行定点乘法：

matlab.

% 定义定点数。

a = fi(0.5, 1, 8, 7); % 1位符号位，8位字长，7位小数位

数。

b = fi(0.25, 1, 8, 7);

% 执行定点乘法。

result = a b;

% 显示结果。

disp(result);

在这个示例中，我们定义了两个定点数`a`和`b`，字长为8位，

小数位数为7位。然后，我们使用""运算符执行乘法操作，并将结

果存储在`result`变量中。最后，我们使用`disp`函数显示结果。

这个示例的输出将是一个定点数`0.125`，字长为8位，小数位

数为7位。