你帮我直接改出来发我

好的，这是修改后的代码：

clc
clear

% 数值法
% 初值
tmin = 0;
tmax = 100;

% 精度
d_doc = 1;
doc = (tmax-tmin)/d_doc;

% 参数直接在后面改
Pf = 10;
m = 700;
ii = 0.03;
% 记得改
i0 = 0.02;
nx = 45;
r = 0.7*0.01;
E = 1;
theta = 0.1;
d = -0.01;
gamma = 1;
kc = 20;
aerfa = 0.7;
lamuda = 0.8;
fai = 10;
beita = 1;
w1 = 2;
w2 = 1;
n = 0.13;
P0 = 25;
huibig = 25;
iworld=0.025;
miu=33600;

syms ee dp p
P1 = -m*beita*(i0+d)*huibig*Pf/(((-fai*theta-(w1-w2)*E-log(n)+i0*beita+d*beita)...
     *(kc-huibig)*Pf*((-fai*theta-(w1-w2)*E-log(n)+i0*beita)/beita/aerfa)^(aerfa/(aerfa-1)))-beita*m*(i0+d)*E)

eqn = miu*(-fai*theta-(w1-w2)*ee-log(n)-iworld*beita)/beita- m*(i0+d)...
     *(E*p-kc*Pf)*beita/p/(-fai*theta-(w1-w2)*E-log(n)+d*beita)/(kc-huibig)/Pf==0;
sol = solve(eqn, E);
ee = double(sol(sol>0)); % 找到正根
disp(ee);

T = linspace(tmin,tmax,doc);
dt = T(2)-T(1);

for i = 1:doc
    result_p(i) = P0;
    p = P0;
    eqn = (-fai*theta-(w1-w2)*ee-log(n))/beita+i0-dp/p...
        -aerfa*(beita*m*(ee*p-huibig*Pf)*(i0+d)/p/(-fai*theta-(w1-w2)*ee-log(n)+i0*beita+d*beita)...
        /(kc-huibig)/Pf)^((aerfa-1)/aerfa)==0;
    temp_dp = solve(eqn,dp);
    temp_dp = double(min(real(temp_dp)));
    dp1(i) = temp_dp;
    P0 = P0 + temp_dp*dt;
    disp(["计算中...",string(i/doc*100)," ％"]);
end

figure
plot(T,result_p)
xlabel("t")
ylabel("p")

figure
plot(T,dp1);
xlabel("t")
ylabel("dp")

dp_p = dp1./result_p;
figure;
plot(T,dp_p)
xlabel("t")
ylabel("dp/p")

希望可以帮到您。