how to plot conditional statement like when Vin=1, Vout=exp(-t/tn) and for Vin =0, Vout=1-exp(-t/tp) where Vin is a periodic square pulse.

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ANWESHA 2014-5-16

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https://ww2.mathworks.cn/matlabcentral/answers/129817-how-to-plot-conditional-statement-like-when-vin-1-vout-exp-t-tn-and-for-vin-0-vout-1-exp-t-tp

评论： Image Analyst 2014-5-16

i have tried as follows:

f=input('please enter the value of time');
t = 0:.00001*f:(1-.00001)*f;
fm=2/f;
Vin = .5+0.5*square(2*pi*fm*t);   
subplot(211);
plot(t,Vin)     
Vdd=5;      
Rn=2000;    
Rp=3000;    
C=0.1e-9;   
Tn=Rn*C;  
Tp=Rp*C;
V1=Vdd.*(exp(-t/Tn));
V0=Vdd*(1-exp(-t/Tp));
Vout=V1;
Vout(Vin<1)=V0(Vin<1);
subplot(212)
plot(t,Vout)

the problem is that for very small value of f, like f=.00000001 the desired graph is not obtained. Even for values like f=0.001, the gradual decay or rise that is expected is not obtained. please help.

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Azzi Abdelmalek 2014-5-16

What is the desired result?

ANWESHA 2014-5-16

编辑：ANWESHA 2014-5-16

When Vin=1, Vout should be 0 with initial exponential decaying curve and if Vin=0 then Vout should be 1 with initial exponential rising curve.

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回答（2 个）

David Sanchez 2014-5-16

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在 MATLAB Online 中打开

statement like when Vin=1, Vout=exp(-t/tn) and for Vin =0, Vout=1-exp(-t/tp):

if (Vin == 1)
  Vout=exp(-t/tn);
elseif (Vin == 0)
  Vout=1-exp(-t/tp);
end

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ANWESHA 2014-5-16

this is the desired result

ANWESHA 2014-5-16

I have also tried with the if and elseif statement.It is not working.

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Image Analyst 2014-5-16

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/129817-how-to-plot-conditional-statement-like-when-vin-1-vout-exp-t-tn-and-for-vin-0-vout-1-exp-t-tp#answer_137024

Can't you just use a convolution, conv(), or filter()? Invert the signal and apply a kernel that only looks to the left. Seems pretty straightforward.