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how does work S-Function block in simulink?

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Ted
Ted 2013-2-26
Hi dears, I know that S-Function block is an outdated block in simulink. but I need to understand how it works because I have to decode an old file. The used code in this s-function is like below. If I enter constant value, a curve is seen,that differences from zero up to the stated value. I dont know what happen on entrance data. any idea?
Thanks a lot, Javad
function [sys,x0] =FT_Ball(t,x,u,flag)
kb=12;
switch flag
case 1
sys(1)=x(2);
sys(2)=x(3);
sys(3)=kb^3*u - 5*kb*x(3) - 6*kb^2*x(2)-kb^3*x(1);
case 3
sys(1)=x(1);
case 0
sys=[3,0,1,1,0,0];
x0=[0,0,0];
case {2,4,9}
sys=[];
end

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回答（1 个）

TAB
TAB 2013-2-26
  1 个评论
Ted
Ted 2013-2-26
Thanks ... but I cant understand explains clearly. Can you explain the notes according to my code ,please.

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