历史上见过的最好的Matlab（ppt课件）

function [sys,x0,str,ts] = sfuntmpl(t,x,u,flag) switch flag, %%%%%%%%%%%%%%%%%% % Initialization % %%%%%%%%%%%%%%%%%% case 0, [sys,x0,str,ts]=mdlInitializeSizes; %%%%%%%%%%%%%%% % Derivatives % %%%%%%%%%%%%%%% case 1, sys=mdlDerivatives(t,x,u); %%%%%%%%%% % Update % %%%%%%%%%% case 2, sys=mdlUpdate(t,x,u); %%%%%%%%%%% % Outputs % %%%%%%%%%%% case 3, sys=mdlOutputs(t,x,u); %%%%%%%%%%%%%%%%%%%%%%% % GetTimeOfNextVarHit % %%%%%%%%%%%%%%%%%%%%%%% case 4, sys=mdlGetTimeOfNextVarHit(t,x,u); %%%%%%%%%%%%% % Terminate % %%%%%%%%%%%%% case 9, sys=mdlTerminate(t,x,u); %%%%%%%%%%%%%%%%%%%% % Unexpected flags % %%%%%%%%%%%%%%%%%%%% otherwise error(['Unhandled flag = ',num2str(flag)]); end % end sfuntmpl % %================================================== % mdlInitializeSizes % Return the sizes, initial conditions, % and sample times for the S-function. %================================================== % function [sys,x0,str,ts]=mdlInitializeSizes sizes = simsizes; % 该语句返回一个没有经过初始化的sizes数组，此数组是 % s-function信息的载体。 % 根据s-function的实际情况及sizes数组各个字段的意义可以 % 对各字段进行赋值。 sizes.NumContStates = 0; sizes.NumDiscStates = 0; sizes.NumOutputs = 0; sizes.NumInputs = 0; sizes.DirFeedthrough = 1; sizes.NumSampleTimes = 1; % at least one sample time is needed sys = simsizes(sizes); % 对sizes赋值完之后，再调用simsizes指令，将定义好的sizes % 数组作为参数，并把结果返回给sys变量。 % 其实，simsizes(sizes)只是把sizes数组组成一个长度为6的 % 向量，因此完全可以用一条简单的赋值语句代替上述赋值。 % sys=[0,0,0,0,1,1]; % 注意输入的顺序与上述字段顺序相同。 % initialize the initial conditions % x0 = []; % % str is always an empty matrix % str = []; % % initialize the array of sample times % ts = [0 0]; % end mdlInitializeSizes % %================================================== % mdlDerivatives % Return the derivatives for the continuous states. %================================================== % function sys=mdlDerivatives(t,x,u) sys = []; % end mdlDerivatives % %==================================================== % mdlUpdate % Handle discrete state updates, sample time hits, % and major time step % requirements. %==================================================== % function sys=mdlUpdate(t,x,u) sys = []; % end mdlUpdate % %===================================================== % mdlOutputs % Return the block outputs. %===================================================== % function sys=mdlOutputs(t,x,u) sys = []; % end mdlOutputs % %======================================================== % mdlGetTimeOfNextVarHit % Return the time of the next hit for this block. % Note that the result is absolute time . % Note that this function is only used when you specify a % variable discrete-time sample time [-2 0] % in the sample time array in mdlInitializeSizes. %======================================================== % function sys=mdlGetTimeOfNextVarHit(t,x,u) sampleTime = 1; % Example, set the next hit to be one second later. sys = t + sampleTime; % end mdlGetTimeOfNextVarHit % %===================================================== % mdlTerminate % Perform any end of simulation tasks. %===================================================== % function sys=mdlTerminate(t,x,u) sys = []; % end mdlTerminate