出现需要使用'Level-2 MATLAB S-Function'的错误

S函数程序为

function calculate_gain_sfunc(block)

setup(block);

end

function setup(block)

% Register the number of ports

block.NumInputPorts = 3; % Q1, Q2, and F2(t)

block.NumOutputPorts = 2; % y1 and y2

% Set up the input and output ports

block.SetPreCompInpPortInfoToDynamic;

block.SetPreCompOutPortInfoToDynamic;

block.InputPort(1).Dimensions = 1; % Q1

block.InputPort(2).Dimensions = 1; % Q2

block.InputPort(3).Dimensions = 1; % F2

block.OutputPort(1).Dimensions = 1; % y1

block.OutputPort(2).Dimensions = 1; % y2

% Register the parameters

block.NumDialogPrms = 9; % J1, L1, R1, AE, F1, J2, L2, R2

% Set the sample time

block.SampleTimes = [0 0];

% Specify the block simStateCompliance

block.SimStateCompliance = 'DefaultSimState';

% Register the methods

block.RegBlockMethod('Outputs', @Output); % Register the output method

end

function Output(block)

% Get the inputs

Q1 = block.InputPort(1).Data;

Q2 = block.InputPort(2).Data;

F2 = block.InputPort(3).Data;

% Get the parameters

J1 = block.DialogPrm(1).Data;

L1 = block.DialogPrm(2).Data;

R1 = block.DialogPrm(3).Data;

AE = block.DialogPrm(4).Data;

F1 = block.DialogPrm(5).Data;

J2 = block.DialogPrm(6).Data;

L2 = block.DialogPrm(7).Data;

R2 = block.DialogPrm(8).Data;

% Compute the gains

gain1 = J1 * L1 / (R1 * (AE - F1));

gain2 = J2 * L2 / (R2 * (F2 - AE));

% Compute the outputs

y1 = gain1 * Q1;

y2 = gain2 * Q2;

% Set the outputs

block.OutputPort(1).Data = y1;

block.OutputPort(2).Data = y2;

end

模型如上图所示

simulink运行结果为：

The specified MATLAB File 'calculate_gain_sfunc' in 'sys/S-Function1' is not a valid Level 1 S-Function. The number of input and/or output arguments is not valid. A likely cause for this error is that the name of a level-2 MATLAB S-function has been specified in this block (which supports only level-1 MATLAB S-functions). Use the 'Level-2 MATLAB S-Function' block from the Simulink library

Answer 1

[Shantanu Dixit]

Hi 伟鹏 ,

The issue arises from the fact that the above S-function code is a 'Level-2 MATLAB S-function', but the block used supports 'Level-1 S-functions' only. The setup(block) method, along with features such as dynamic port handling and the use of block.RegBlockMethod to register callbacks, are specific to Level-2 S-functions.

To resolve this, you can switch from the standard 'S-Function' block to the 'Level-2 MATLAB S-Function' block in Simulink. This will ensure that the methods and functionality of your Level-2 S-function code are compatible with the block you're using.

Additionally refer to the following MathWorks documentation to know more about Level-2 MATLAB methods:

setup: https://www.mathworks.com/help/simulink/sfg/setup.html

Level-2 MATLAB methods: https://www.mathworks.com/help/simulink/sfg/writing-level-2-matlab-s-functions.html#f7-68222