f = @(delv)(sqrt(2.*q.*Nsub./Csi.*(delv+vt.*(ni./Nsub).^2.*(exp(delv./vt)-1))+(vt.*(exp(-delv./vt)-1)))); delv=Vs1-Vbef+A-R-S-B(1+(Cox./Csi))-(-(q.*Np.*tsi./Cox)+(Csi.*f./Cox)).*(1+Cox./Csi);

f = @(delv) str2sym('(sqrt(2.*q.*Nsub./Csi.*(delv+vt.*(ni./Nsub).^2.*(exp(delv./vt)-1))+(vt.*(exp(-delv./vt)-1))))'); delv=@(f) str2sym('Vs1-Vbef+A-R-S-B(1+(Cox./Csi))-(-(q.*Np.*tsi./Cox)+(Csi.*f./Cox)).*(1+Cox./Csi)'); f(delv) %f is a function of delv delv(f) %delv is a function of f

I have attached my problem please write its matlab command.

madhan ravi 2018-11-9

编辑：madhan ravi 2018-11-9

by the way what do you want to from the above equations there are no datas for the variables ,if the above doesn't work upload your file by clicking the paper clip button {}.

A GARG 2018-11-9

编辑：madhan ravi 2018-11-9

The other variables are defined in my program. I was facing problem in writing these 2 lines only. I was using some iteration to find out the value of 'f' which will be suitable to put in 'delv'. As you have answered it, I will try your code now.

A GARG 2018-11-11

编辑：A GARG 2018-11-11

在 MATLAB Online 中打开

I have attached my code. Now my problem is to get a value return after solving this iteration problem . Don't worry about the other variables, they are well defined in my program.

{ f = @(delv)(sqrt(2.*q.*Nsub./Csi.*(delv+vt.*(ni./Nsub).^2.*(exp(delv./vt)-1))+(vt.*(exp(-delv./vt)-1))))

 format long 
 eps_abs = 1e-15
 eps_step = 1e-15
a=0
v=15e-9
 while ((v - a) >= eps_step || ( abs( f(a) ) >= eps_abs && abs( f(v) )  >= eps_abs ) )
     s = (a + v)/2
    if ( f(s) ==  eps_abs )
       break
    elseif ( (f(a)*f(s)) < 0 )
       v = s
    else
       a = s
    end
 end

d=a

delv=Vs1-Vbef+A-R-S-B(1+(Cox./Csi))-(-(q.*Np.*tsi./Cox)+(Csi.*d./Cox)).*(1+Cox./Csi);
}

madhan ravi 2018-11-11

"Don't worry about the other variables, they are well defined in my program."

If you want a proper help provide all the necessary details

A GARG 2018-11-11

My program is too long and it has many variables defined into the other. So the main problem is I am unable to get the value returned after iteration. Can you help in iteration portion particularly?

madhan ravi 2018-11-11

编辑：madhan ravi 2018-11-11

which value do you want to return ? attach your script file

I have attached my problem please write its matlab command.

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I have attached my problem please write its matlab command.

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