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S功能示例

Overview of Examples

To run an example:

In the MATLAB^®Command Window, entersfundemos。
这S-function example library opens.

Each block represents a category of S-function examples.
Double-click a category to display the examples that it includes. For example, clickC-files。
Double-click a block to open and run the example that it represents.

It might be helpful to examine some sample S-functions as you read the next chapters. Code for the examples is stored in the following folder under the MATLAB root folder.

MATLAB code	`toolbox/simulink/simdemos/simfeatures`
C, C++, and Fortran code	`toolbox/simulink/simdemos/simfeatures/src`

2级MATLAB S功能示例

这matlabroot/toolbox/simulink/simdemos/simfeatures文件夹（open）包含许多2级MATLAB S功能。考虑从查看这些文件开始。

Filename	型号名称	Description
`MSFCN_DSC.M`	`MSFCNDEMO_SFUNDSC1`	Implement an S-function with an inherited sample time.
`MSFCN_LIMINTM.M`	`msfcndemo_limintm`	Implement a continuous limited integrator where the output is bounded by lower and upper bounds and includes initial conditions.
`msfcn_multirate.m`	`MSFCNDEMO_MULTIRATE`	Implement a multirate system.
`msfcn_times_two.m`	`msfcndemo_timestwo`	Implement an S-function that doubles its input.
`msfcn_unit_delay.m`	`MSFCNDEMO_SFUNDSC2`	Implement a unit delay.
`MSFCN_VARPULSE.M`	`MSFCNDEMO_VARPULSE`	Implement a variable pulse width generator by calling`set_param`从2级MATLAB S功能中。还演示了如何使用自定义集并获取块SimState的方法。
`msfcn_vs.m`	`msfcndemo_vsfunc`	Implement a variable sample time block in which the first input is delayed by an amount of time determined by the second input.

1级MATLAB S功能示例

这matlabroot/toolbox/simulink/simdemos/simfeatures文件夹（open）还包含许多Level-1 Matlab S功能，作为旧模型的参考。这些Level-1 MATLAB S函数中的大多数没有相关的示例模型。

Filename	Description
`csfunc.m`	Define a continuous system in state-space format.
`dsfunc.m`	Define a discrete system in state-space format.
`limintm.m`	Implement a continuous limited integrator where the output is bounded by lower and upper bounds and includes initial conditions.
`mixedm.m`	实现由单位延迟串联的连续集成器组成的混合系统。
`sfun_varargm.m`	Implement an S-function that shows how to use the MATLAB command`varargin`。
`vsfunc.m`	Illustrate how to create a variable sample time block. This S-function implements a variable step delay in which the first input is delayed by an amount of time determined by the second input.

C函数示例

这matlabroot/toolbox/simulink/simdemos/simfeatures/src文件夹（open）包含C MEX S函数的示例，其中许多具有MATLAB S功能对应物。下表中列出了C MEX S函数。

Filename	型号名称	Description
`csfunc.c`	`sfcndemo_csfunc`	Implement a continuous system.
`dlimintc.c`	No model available	实施离散时间有限的集成器。
`dsfunc.c`	`sfcndemo_dsfunc`	实施离散系统。
`limintc.c`	No model available	实施有限的集成商。
`mixedm.c`	`sfcndemo_mixedm`	Implement a hybrid dynamic system consisting of a continuous integrator (1/s) in series with a unit delay (1/z).
`Mixhmex.C`	`sfcndemo_mixedmex`	实现具有单个输出和两个输入的混合动态系统。
`slexQuantizeSFcn.c`	`sfcndemo_sfun_quantize`	实施矢量化量化器。按照量化间隔参数指定的步骤将输入量化为步骤`问`。
`sdotproduct.C`	`sfcndemo_sdotproduct`	两个真实或复杂向量的计算点产物（多重蓄电）。
`sfbuilder_bususage.c`	`sfbuilder_bususage`	Access S-Function Builder with a bus input and output.
`sfbuilder_movingAverage.c`	`sfbuilder_movingAverage`	Implement simple time window moving average using开始andTerminate。
`sftable2.c`	`sfcndemo_sftable2`	Implement a two-dimensional table lookup.
`sfun_atol.c`	`sfcndemo_sfun_atol`	为每个继续设置不同的绝对误差ous state.
`sfun_cplx.c`	`sfcndemo_cplx`	Add complex data for an S-function with one input port and one parameter.
`sfun_directlook.c`	No model available	实施直接的1D查找。
`sfun_dtype_io.c`	`sfcndemo_dtype_io`	Implement an S-function that uses Simulink^®输入和输出的数据类型。
`sfun_dtype_param.c`	`sfcndemo_dtype_param`	实施一个使用simulink数据类型进行参数的s功能。金宝app
`sfun_dynsize.c`	`sfcndemo_sfun_dynsize`	Implements dynamically-sized outputs .
`sfun_errhdl.c`	`sfcndemo_sfun_errhdl`	Check parameters using the`mdlCheckParameters`S-function routine.
`sfun_fcncall.c`	`sfcndemo_sfun_fcncall`	Execute function-call subsystems on the first and second output elements.
`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`	实施基于多通道框架的离散转换（及其倒数）。
`sfun_frmunbuff.c`	`sfcndemo_frame`	Implement a frame-based unbuffer block.
`sfun_multiport.c`	`sfcndemo_sfun_multiport`	Configure multiple input and output ports.
`sfun_manswitch.c`	No model available	实现手动开关。
`sfun_matadd.c`	`sfcndemo_matadd`	在一个输入端口，一个输出端口和一个参数中添加矩阵。
`sfun_multirate.c`	`SFCNDEMO_SFUN_MULTIRATE`	Demonstrate how to specify port-based sample times.
`sfun_port_constant.c`	`sfcndemo_port_constant`	演示如何指定基于恒定的端口样本时间。
`sfun_port_triggered.c`	`SFCNDEMO_PORT_TRIGGED`	Demonstrate how to use port-based sample times in a triggered subsystem.
`sfun_runtime1.c`	`sfcndemo_runtime`	Implement run-time parameters for all tunable parameters.
`sfun_runtime2.c`	`sfcndemo_runtime`	注册单个运行时参数。
`sfun_runtime3.c`	`sfcndemo_runtime`	Register dialog parameters as run-time parameters.
`sfun_runtime4.c`	`sfcndemo_runtime`	Implement run-time parameters as a function of multiple dialog parameters.
`sfun_simstate.c`	No model available	演示用于保存和恢复SimState的S功能API。
`sfun_zc.c`	`sfcndemo_sfun_zc`	证明使用非采样零交叉来实施`abs(u)`。This S-function is designed to be used with a variable-step solver.
`sfun_zc_sat.c`	`sfcndemo_sfun_zc_sat`	Demonstrate zero crossings with saturation.
`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`	演示连续的积分器，其中使用单独的局部求解器而不是模型使用的求解器求解连续状态。
`sfun_angle_events.c`	`sfcndemo_angle_events`	实施一种方法，以稳健有效地检测旋转的身体交叉指定角度。
`sfun_angle_events.c`	No model available	Demonstrate angle detection and incorporate Stateflow^®安排功能调用。
`sfunmem.c`	`sfcndemo_sfunmem`	实现一个one-integration-step延迟和抱着我mory function.
`simomex.c`	`sfcndemo_simomex`	Implement a single-input, two-output state-space dynamic system described by the state-space equations: dx/dt = ax + bu y = cx + du where`X`是国家向量，`你`is vector of inputs, and`y`是输出的向量。
`stspace.c`	`sfcndemo_stspace`	Implement a set of state-space equations. You can turn this into a new block by using the S-Function block and mask facility. This example MEX file performs the same function as the built-in State-Space block. This is an example of a MEX file where the number of inputs, outputs, and states is dependent on the parameters passed in from the workspace.
`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`	Implement a discrete-time transfer function whose transfer function polynomials are passed in via the input vector. This is useful for discrete-time adaptive control applications.
`stvmgain.c`	`sfcndemo_stvmgain`	Implement a time-varying matrix gain.
`table3.c`	No model available	Implement a 3-D lookup table.
`timestwo.c`	`sfcndemo_timestwo`	Implement a C MEX S-function that doubles its input.
`vdlmintc.c`	No model available	Implement a discrete-time vectorized limited integrator.
`vdpmex.c`	`sfcndemo_vdpmex`	实现范德尔方程。
`vlimintc.c`	No model available	实施矢量有限积分器。
`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`	说明如何创建可控的样本时间块。
`sfun_d2c`	`sfcndemo_d2c`	Illustrate how to convert a discrete input signal into a smooth continuous output signal

fortran s功能示例

这following table lists sample Fortran S-functions available in thematlabroot/toolbox/simulink/simdemos/simfeatures/src文件夹（open）。

Filename	型号名称	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

下表列出了在matlabroot/toolbox/simulink/simdemos/simfeatures/src文件夹（open）。

Filename	型号名称	Description
`sfun_counter_cpp.cpp`	`sfcndemo_counter_cpp`	将C ++对象存储在Pointers矢量中`PWork`。
`sfbuilder_permute.cpp`	`sfbuilder_permunt`	Implement permutation by calling external C++ classes using Start and Terminate.
`sfbuilder_linfilt.cpp`	`sfbuilder_upsmpling`	Implement linear filtering with C++ STL algorithms for the upsampling of a sign wave.