S功能Examples

These examples show you how to work with a variety of S-functions or programs that use S-functions, including C/C++ S-functions, Fortran S-functions, S-function Builder, Level 2 MATLAB^®S-functions, and Blockset Designer. Each section explains how to open the files and what is in them. These are good places to continue to develop an understanding S-functions after learning the basics. These do not represent all the examples available for S-functions, but a relevant subsection.

访问s功能示例

Most of the S-function examples are run throughsfundemos。This example library contains S-function models and is grouped by coding type, such as C S-functions or C++ S-functions.

从sfundemos:

在MATLAB命令窗口中，输入sfundemos。
S功能示例库打开。

Each block represents a category of S-function examples.
双击一个类别以显示其包含的示例。例如，单击C文件。
Double-click a block to open and run the example that it represents.

阅读下一章时，检查一些样本S功能可能会有所帮助。示例的代码存储在MATLAB根文件夹下的以下文件夹中。

MATLABcode	`toolbox/simulink/simdemos/simfeatures`
C，C ++和Fortran代码	`toolbox/simulink/simdemos/simfeatures/src`

Level-2 MATLAB S-Function Examples

TheMatlabroot/toolbox/simulink/simdemos/simfeaturesfolder (打开) contains many Level-2 MATLAB S-functions. Consider starting off by looking at these files. For more on Level-2 MATLAB S-functions, see写2级MATLAB S命令。

文件名	Model Name	Description
`msfcn_dsc.m`	`msfcndemo_sfundsc1`	用继承的示例时间实现S功能。
`msfcn_limintm.m`	`MSFCNDEMO_LIMINTM`	实现连续有限的集成器，其中输出由下层和上限界定，并包括初始条件。
`msfcn_multirate.m`	`msfcndemo_multirate`	实施多室系统。
`msfcn_times_two.m`	`msfcndemo_timestwo`	实现S函数，使其输入加倍。
`msfcn_unit_delay.m`	`msfcndemo_sfundsc2`	Implement a unit delay.
`msfcn_varpulse.m`	`msfcndemo_varpulse`	通过调用可变脉冲宽度生成器`set_param`from within a Level-2 MATLAB S-function. Also demonstrates how to use custom set and get methods for the block`SimState`。
`MSFCN_VS.M`	`msfcndemo_vsfunc`	实现可变样本时间块，其中第一个输入延迟了第二个输入确定的时间。

C S-Function Examples

TheMatlabroot/toolbox/金宝appsimulink/simdemos/simfeatures/srcfolder (打开) contains examples of C MEX S-functions, many of which have a MATLAB S-function counterpart. The C MEX S-functions are listed in the following table. For more on C S-functions, seeC/C++ S-Function Basics和使用S功能构建器自动构建S函数。

文件名	Model Name	Description
`csfunc.c`	`sfcndemo_csfunc`	Implement a continuous system.
`dlimintc.c`	没有可用的模型	Implement a discrete-time limited integrator.
`dsfunc.c`	`sfcndemo_dsfunc`	Implement a discrete system.
`limintc.c`	没有可用的模型	Implement a limited integrator.
`混合M.C`	`sfcndemo_mixedm`	实现由单位延迟（1/z）的连续集成器（1/s）组成的混合动力系统。
`mixedmex.c`	`sfcndemo_mixedmex`	Implement a hybrid dynamic system with a single output and two inputs.
`slexQuantizeSFcn.c`	`sfcndemo_sfun_quantize`	Implement a vectorized quantizer. Quantizes the input into steps as specified by the quantization interval parameter,`q`。
`sdotproduct.c`	`sfcndemo_sdotproduct`	Compute dot product (multiply-accumulate) of two real or complex vectors.
`sfbuilder_bususage.c`	`sfbuilder_bususage`	Access S-Function Builder with a bus input and output.
`sfbuilder_movingaveration。c`	`sfbuilder_movingaveration`	使用简单的时间窗口移动平均Start和终止。
`sftable2.c`	`sfcndemo_sftable2`	实现二维表查找。
`sfun_atol.c`	`sfcndemo_sfun_atol`	Set different absolute tolerances for each continuous state.
`sfun_cplx.c`	`sfcndemo_cplx`	使用一个输入端口和一个参数添加复杂的数据以进行S功能。
`sfun_directlook.c`	没有可用的模型	Implement a direct 1-D lookup.
`sfun_dtype_io.c`	`sfcndemo_dtype_io`	Implement an S-function that uses Simulink^®data types for inputs and outputs.
`sfun_dtype_param.c`	`sfcndemo_dtype_param`	Implement an S-function that uses Simulink data types for parameters.
`sfun_dynsize.c`	`sfcndemo_sfun_dynsize`	实施动态大小的输出。
`sfun_errhdl.c`	`sfcndemo_sfun_errhdl`	Check parameters using the`mdlCheckParameters`S-function routine.
`sfun_fcncall.c`	`sfcndemo_sfun_fcncall`	在第一个和第二个输出元素上执行功能通话子系统。
`sfun_frmad.c`	`sfcndemo_frame`	Implement a frame-based A/D converter.
`sfun_frmda.c`	`sfcndemo_frame`	Implement a frame-based D/A converter.
`sfun_frmdft.c`	`sfcndemo_frame`	Implement a multichannel frame-based Discrete-Fourier transformation (and its inverse).
`sfun_frmunbuff.c`	`sfcndemo_frame`	实现基于框架的非封底块。
`sfun_multiport.c`	`sfcndemo_sfun_multiport`	配置多个输入和输出端口。
`sfun_manswitch.c`	没有可用的模型	Implement a manual switch.
`sfun_matadd.c`	`sfcndemo_matadd`	Add matrices in an S-function with one input port, one output port, and one parameter.
`sfun_multirate.c`	`sfcndemo_sfun_multirate`	演示如何指定基于端口的样本时间。
`sfun_port_constant.c`	`sfcndemo_port_constant`	Demonstrate how to specify constant port-based sample times.
`sfun_port_triggered.c`	`sfcndemo_port_triggered`	Demonstrate how to use port-based sample times in a triggered subsystem.
`sfun_runtime1.c`	`sfcndemo_runtime`	实现所有可调参数的运行时参数。
`sfun_runtime2.c`	`sfcndemo_runtime`	Register individual run-time parameters.
`sfun_runtime3.c`	`sfcndemo_runtime`	注册对话框参数作为运行时参数。
`sfun_runtime4.c`	`sfcndemo_runtime`	实现运行时参数作为多个对话框参数的函数。
`sfun_zc.c`	`sfcndemo_sfun_zc`	Demonstrate use of nonsampled zero crossings to implement`ABS（U）`。该S函数旨在与可变步骤求解器一起使用。
`sfun_zc_sat.c`	`sfcndemo_sfun_zc_sat`	证明饱和度为零。
`sfun_zc_cstate_sat.c`	`sfcndemo_sfun_zc_cstate_sat`	Implement a continuous integrator with saturation limits and zero-crossing detection.
`sfun_integrator_localsolver.c`	`sfcndemo_sfun_localsolver`	Demonstrate a continuous integrator where the continuous states are solved using a separate local solver instead of that used by the model.
`sfun_angle_events.c`	`sfcndemo_angle_events`	Implement a method for robust and efficient detection of a rotating body crossing specified angles.
`sfun_angle_events.c`	没有可用的模型	演示角度检测并结合状态流^®to schedule function calls.
`sfunmem.c`	`sfcndemo_sfunmem`	实施一个综合步骤延迟并保持内存功能。
`simomex.c`	`sfcndemo_simomex`	实现由状态空间方程描述的单输入，两输出状态空间动态系统： dx/dt = Ax + Bu y = Cx + Du 在哪里`x`is the state vector,`u`是输入的向量，`y`is the vector of outputs.
`stspace.c`	`sfcndemo_stspace`	实施一组状态空间方程。您可以使用S功能块和掩码设施将其变成新的块。此示例MEX文件执行与内置状态空间块相同的功能。这是MEX文件的一个示例，其中输入，输出和状态的数量取决于从工作区传递的参数。
`stvctf.c`	`sfcndemo_stvctf`	Implement a continuous-time transfer function whose transfer function polynomials are passed in via the input vector. This is useful for continuous time adaptive control applications.
`stvdtf.c`	`sfcndemo_stvdtf`	实施一个离散的时间传输函数，其传输函数多项式通过输入向量传递。这对于离散时间自适应控制应用很有用。
`stvmgain.c`	`sfcndemo_stvmgain`	实施时间变化的矩阵增益。
`table3.c`	没有可用的模型	实现3D查找表。
`timestwo.c`	`sfcndemo_timestwo`	Implement a C MEX S-function that doubles its input.
`vdlmintc.c`	没有可用的模型	实施离散的时间矢量有限积分器。
`vdpmex.c`	`sfcndemo_vdpmex`	Implement the Van der Pol equation.
`vlimintc.c`	没有可用的模型	Implement a vectorized limited integrator.
`vsfunc.c`	`sfcndemo_vsfunc`	Illustrate how to create a variable sample time block. This block implements a variable-step delay in which the first input is delayed by an amount of time determined by the second input.
`sfun_pwm.c`	`sfcndemo_pwm`	Illustrate how to create a controllable sample time block.
`sfun_d2c`	`sfcndemo_d2c`	说明如何将离散输入信号转换为平滑的连续输出信号

Fortran S-Function Examples

下表列出了在Matlabroot/toolbox/金宝appsimulink/simdemos/simfeatures/srcfolder (打开）。有关Fortran S功能的更多信息，请参阅创建2级fortran s功能。

文件名	Model Name	Description
`sfun_atmos.c` `sfun_atmos_sub.F`	`sfcndemo_atmos`	Calculate the 1976 standard atmosphere to 86 km using a Fortran subroutine.

C++ S-Function Examples

The following table lists sample C++ S-functions available in theMatlabroot/toolbox/金宝appsimulink/simdemos/simfeatures/srcfolder (打开）。For more on C++ S-functions, seeC/C++ S-Function Basics和使用S功能构建器自动构建S函数。

文件名	Model Name	Description
`sfun_counter_cpp.cpp`	`sfcndemo_counter_cpp`	Store a C++ object in the pointers vector`PWORK`。
`sfbuilder_permute.cpp`	`sfbuilder_permutation`	实现排列通过调用外部的c++一堂课ses using Start and Terminate.
`sfbuilder_linfilt.cpp`	`sfbuilder_upsampling`	用C ++ STL算法实现线性过滤，以提高符号波。

在一个项目中组织S功能

下面的示例显示了如何将S功能伪像安排到项目中。这是使用“模块设计器”功能完成的。有关区块设计师的更多信息，请参阅创建一个模块项目。

文件名	Description
`slexBlocksetDesignerExample`	使用模块设计师将S功能伪像组织到一个单个项目中。