错误使用 tf (line 299) The values of the "Numerator" and "Denominator" properties must be row vectors or cell arrays of row vectors, where each vector is nonempty and containing numeric data. Type "help tf.num" or "help tf.den" for more information. 出错 a (line 11) tf_sys = tf(num, den);
时间: 2024-03-03 17:51:05 浏览: 36
根据错误提示,MATLAB 报错的原因是分子和分母多项式的格式不正确。在您提供的代码中,使用 `ss2tf` 函数得到的分子和分母多项式可能不是行向量形式,或者其中包含非数值数据。
为了解决这个问题,可以使用 `squeeze` 函数将多维数组压缩为行向量。同时,使用 `num2str` 函数将分子和分母多项式转化为字符串,方便查看其内容。代码如下:
```
A = [0 1 0 0; -0.6 0 0.4 0; 0 0 0 1; 0.4 0 -1 0];
B = [0 0; 0.2 0; 0 0; 0 0.2];
C = [1 0 0 0; 0 0 1 0];
D = [0 0; 0 0];
[num, den] = ss2tf(A, B, C, D, 1);
num_str = num2str(squeeze(num));
den_str = num2str(squeeze(den));
tf_sys = tf(num, den);
```
这样,得到的分子和分母多项式就是行向量形式的字符串,可以方便地查看其内容了。
相关问题
The values of the "Numerator" and "Denominator" properties must be row vectors or cell arrays of row vectors, where each vector is nonempty and containing numeric data. Type "help tf.num" or "help tf.den" for more information. 出错 a (line 16) tf_sys = tf(num, den);
根据错误提示,MATLAB报错是因为传递函数的分子和分母多项式不是行向量或行向量的 cell 数组,每个向量都必须包含数值数据,而不能包含其他类型的数据。
解决这个问题,可以将分子和分母多项式转换为行向量形式,使用 MATLAB 的 `reshape` 函数将结果重新变形为行向量。代码如下:
```
A = [0 1 0 0; -0.6 0 0.4 0; 0 0 0 1; 0.4 0 -1 0];
B = [0 0; 0.2 0; 0 0; 0 0.2];
C = [1 0 0 0; 0 0 1 0];
D = [0 0; 0 0];
[num, den] = ss2tf(A, B, C, D, 1);
num = reshape(num.', 1, []);
den = reshape(den.', 1, []);
tf_sys = tf(num, den);
```
这里,使用 `reshape` 和转置操作将多项式向量变形为行向量形式。然后,将变形后的分子和分母多项式作为参数传递给 `tf` 函数,得到转换后的传递函数模型 `tf_sys`。
In preparation for a class Fraction, create a class NullDenominatorException that must be a checked exception whose instances are thrown if the denominator of an object of class Fraction is 0.
Sure, here's an example implementation of the NullDenominatorException class in Java:
```
public class NullDenominatorException extends Exception {
public NullDenominatorException() {
super("Denominator cannot be null or zero.");
}
}
```
In this implementation, we extend the built-in Exception class to create our custom exception. We also provide a constructor that sets the exception message to a default value of "Denominator cannot be null or zero.". This message will be displayed when the exception is thrown.
To use this exception in our Fraction class, we can add a check for a null or zero denominator in the constructor and throw the exception if necessary. Here's an example implementation of the Fraction class:
```
public class Fraction {
private int numerator;
private int denominator;
public Fraction(int numerator, int denominator) throws NullDenominatorException {
if (denominator == 0) {
throw new NullDenominatorException();
}
this.numerator = numerator;
this.denominator = denominator;
}
// other methods for adding, subtracting, multiplying, and dividing Fractions
}
```
In this implementation, we check if the denominator is 0 and throw a NullDenominatorException if it is. Otherwise, we set the numerator and denominator instance variables and continue with the construction of the Fraction object.
相关推荐
![rar](https://img-home.csdnimg.cn/images/20210720083606.png)
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)