matlab创建长度为2的向量,simulink仿真出错，提示s-Function的output必须是长度为2的向量...

您可以使用以下命令创建长度为2的向量：

v = [0 0];

如果 Simulink 提示 s-Function 的输出必须是长度为2的向量，那么您需要检查您的 s-Function 是否正确地输出了一个长度为2的向量。如果您的 s-Function 输出的是一个不同长度的向量，则需要修改 s-Function 以输出长度为2的向量。如果您不确定如何修改 s-Function，请参考 Simulink 的文档或咨询 Simulink 的支持团队。

相关问题

simulink error：Error in default port dimensions function of S-function ‘XXXXXXXXXXX’. This function ...

这个错误通常表示Simulink S-Function的默认端口尺寸函数存在问题。默认端口尺寸函数是用于指定S-Function输入和输出端口尺寸的函数。当Simulink试图自动计算端口尺寸时，会调用此函数。

有几种可能的原因导致此错误：

1. S-Function的默认端口尺寸函数中有语法错误或逻辑错误。

2. S-Function中的输入和输出端口未正确指定尺寸。

3. S-Function代码中存在其他错误，导致无法计算端口尺寸。

要解决此问题，可以尝试以下步骤：

1. 检查S-Function的默认端口尺寸函数是否存在语法或逻辑错误。

2. 确保S-Function中的输入和输出端口已正确指定尺寸。

3. 检查S-Function的代码是否存在其他错误，例如未定义的变量或函数。

如果以上步骤都无法解决问题，您可以尝试手动指定端口尺寸，或者联系Simulink支持团队以获取更多帮助。

Level-2 MATLAB S-function

A Level-2 MATLAB S-function is a Simulink block that can be used to implement custom, nonlinear models in Simulink. It is Level-2 because it provides more advanced capabilities than a Level-1 S-function, including the ability to store state information and handle continuous-time signals.

To create a Level-2 MATLAB S-function, you need to define the following functions:

1. mdlInitializeSizes: This function is called once at the start of simulation to set up the block's input and output ports.

2. mdlInitializeConditions: This function is called once at the start of simulation to initialize the block's states.

3. mdlOutputs: This function is called at each simulation time step to compute the block's output.

4. mdlUpdate: This function is called at each simulation time step to update the block's states.

5. mdlTerminate: This function is called once at the end of simulation to clean up any resources used by the block.

In addition to these functions, you may also need to define other functions depending on the specific requirements of your model.

Once you have defined your S-function, you can use it in a Simulink model just like any other block. You can also customize the block's parameters and properties to suit your needs.