sawtooth unexpected changes in simulink

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BARAN Özbakr 2014-3-5

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/120275-sawtooth-unexpected-changes-in-simulink

Hello everyone, I am trying to create triangular wave in simulink in user defined function:

My code is;

function [s1,s2,s3,s4,g1,g2,g3,g4,g1in,g2in,g3in,g4in]= fcn(sin)
persistent t;
s1=[0];
s2=[0];
s3=[0];
s4=[0];
a=[0];
b=[0];
c=[0];
d=[0];
coder.extrinsic('sawtooth')
if  isempty(t)
t=0;
end
T=0.000001;
Ts=0.000001;
t=t+Ts;
a=sawtooth(2*1000*pi*t,0.5);
s1=a;
b=sawtooth(2*1000*pi*t-pi,0.5)/4;
s2=b+0.25;
c=sawtooth(2*1000*pi*t,0.5)/4;
s3=c-0.25;
d=sawtooth(2*1000*pi*t-pi,0.5)/4;
s4=d-0.75;
end

actually, I am trying to create triangular wave that its freq is 1000 Hz. I could do it with this code, but after 3 or 4 simulation freq of triangular wave is changed itself. Same code same simulink but it is changed

I could not understand that . May u help me ?

thankss