动态时间间隔

天际

请大家帮下忙？怎么产生间隔服从指数分布，幅度服从锐利分布的随机脉冲信号？下面是我用s-函数写的程序，但是结果不正确，请大家帮忙看下。 （1）产生间隔为0.1，0.2，0.3，……，宽度为0.2的脉冲序列

function [sys,x0,str,ts] = my132(t,x,u,flag,T,r) T=0; r=0.1;
switch flag, case 0,
[sys,x0,str,ts]=mdlInitializeSizes;
case 1,
sys=mdlDerivatives(t,x,u);
case 2,
sys=mdlUpdate(t,x,u);
case 3, sys=mdlOutputs(t,x,u,T,r); case 4, sys=mdlGetTimeOfNextVarHit(t,x,u); case 9, sys=mdlTerminate(t,x,u); otherwise error(['Unhandled flag = ',num2str(flag)]); end function [sys,x0,str,ts]=mdlInitializeSizes sizes = simsizes; sizes.NumContStates = 0; sizes.NumDiscStates = 0; sizes.NumOutputs = 1; sizes.NumInputs = 0; sizes.DirFeedthrough = 1; sizes.NumSampleTimes = 1; sys = simsizes(sizes); x0 = []; str = []; ts = [0.01 0]; function sys=mdlDerivatives(t,x,u) sys = []; function sys=mdlUpdate(t,x,u) sys = []; function sys=mdlOutputs(t,x,u,T,r) if t>=T&&t<=T+r sys =0; elseif t>T+r&&t<=T+r+0.2 sys=1; else T=r+0.2+T; r=r+0.1; sys=mdlOutputs(t,x,u,T,r); end function sys=mdlGetTimeOfNextVarHit(t,x,u) sampleTime =1; sys = t + sampleTime; function sys=mdlTerminate(t,x,u) sys = []; （2）产生间隔为rand,宽度为0.2的脉冲。借助与（1）的思想，但运行的结果不正确，请大家把那个我看下，是不是方法错了。还又没有其他的方法 function [sys,x0,str,ts] = my132(t,x,u,flag,T,r) T=0; r=rand; switch flag, case 0, [sys,x0,str,ts]=mdlInitializeSizes; case 1, sys=mdlDerivatives(t,x,u); case 2, sys=mdlUpdate(t,x,u); case 3, sys=mdlOutputs(t,x,u,T,r); case 4, sys=mdlGetTimeOfNextVarHit(t,x,u); case 9, sys=mdlTerminate(t,x,u); otherwise error(['Unhandled flag = ',num2str(flag)]); end function [sys,x0,str,ts]=mdlInitializeSizes sizes = simsizes; sizes.NumContStates = 0; sizes.NumDiscStates = 0; sizes.NumOutputs = 1; sizes.NumInputs = 0; sizes.DirFeedthrough = 1; sizes.NumSampleTimes = 1; sys = simsizes(sizes); x0 = []; str = []; ts = [0.01 0]; function sys=mdlDerivatives(t,x,u) sys = []; function sys=mdlUpdate(t,x,u) sys = []; function sys=mdlOutputs(t,x,u,T,r) if t>=T&&t<=T+r sys =0; elseif t>T+r&&t<=T+r+0.2 sys=1; else T=r+0.2+T; r=rand; sys=mdlOutputs(t,x,u,T,r); end function sys=mdlGetTimeOfNextVarHit(t,x,u) sampleTime =1; sys = t + sampleTime; function sys=mdlTerminate(t,x,u) sys = []; 请大家帮忙，感谢感谢！


（1）是对的，（2）不知道为什么就有问题。

[ 本帖最后由 天际 于 2008-10-16 10:18 编辑 ]