Simulation of rate equation

  1. i have try this rate equation code in MATLAB. but its not working. can anyone help me please!!!!!
    mm=0;

    for I = 0.1e-3:0.1e-3:4.5e-3;
    m=mm+1;
    q=1.6e-19;
    alpha=2;
    Tn=3e-9;
    Tp=1e-12;
    G0=0.6;
    N0 = 1e24;

    Gamma=.2;
    epsilon=1e1;
    Va=3.7e-14;
    tini=0;
    tfin=4e-9;
    dt=1e-12;
    N(1)=0;
    S(1)=0;
    p=G0*N(m)*S(m);
    l=1+epsilon*S(m);
    y=q*Va;
    for t=tini:dt:tfin
    delN=(I/y)-(N(m)/Tn)-(p/l);



    end

    end

    tt=t;
    tt=tt*1e9;
    figure(1);
    plot(tt,N);
     
    Last edited by a moderator: Jul 19, 2010
  2. jcsd
  3. I'm not sure whether Matlab requires that you define your variables before attempting to execute them, but I see that line 4, for example, (I0 = N0*q*Va/Tn;) contains several variables you do not define until later in your routine.
     
  4. berkeman

    Staff: Mentor

    Welcome to the PF. What do you mean by "not working"? Does MATLAB throw an error somewhere, or does the program run and not give a reasonable answer?
     
  5. MATLAB isnt throwing any error. NOT WORKING means i am getting a white or blank graph. i have tried with different axis values but still no result.
     
  6. uart

    uart 2,774
    Science Advisor

    Code (Text):
    p=G0*N(m)*S(m);
    l=1+epsilon*S(m)
    Both those lines are bound to throw an error on the second iteration because neither N() or S() are defined past an index of 1.
     
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