How to make my code run faster?

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Sarah Kandeel
Sarah Kandeel 2018-2-25
评论： Sarah Kandeel 2018-2-27
Hello, I just wanted to know, how do I make this code run faster?
tic
for z_0=0.1:0.05:0.8
for R_0=0.01:0.05:1
for N=0:1:5
load('am_z.mat')
syms D_guess; x_h=1; x_w=3.9/7.4; theta0= 0; theta1= 1; u= 1; AM=0.968740; BM=0.969441; alpha_h_Ih=0.25; alpha_h_xh=0.25; alpha_h_xw =0.25; alpha_h_theta=0.25; alpha_h_Yh= 0.25; alpha_w_Iw= 1/3; alpha_w_xh=1/3; alpha_w_xw= 1/3; alpha_h_am=1- alpha_h_Ih- alpha_h_xh; alpha_h_bm=1- alpha_h_Yh- alpha_h_xh; Y_h=1; Y_w=1; %z_0=0.5; R_0=0.5; N=1;
%% Defining the functions t_w=(Y_w-D_guess)*(1-exp(-(alpha_w_xh*u*sqrt(x_h))/(alpha_w_Iw)));
I_h=Y_h+D_guess+t_w;
p =z_0*(1-sqrt(z));
u_h0= alpha_h_Ih*log(I_h)+alpha_h_xh*log(x_h)+alpha_h_xw*sqrt(x_w)+alpha_h_theta*sqrt(theta0); %u_h when theta=0
u_h1= alpha_h_Ih*log(Y_h+D_guess)+alpha_h_xh*log(x_h)+alpha_h_xw*sqrt(x_w)+alpha_h_theta*sqrt(theta1); %u_h when theta=1
v_h=alpha_h_Ih*log(Y_h+D_guess)+alpha_h_xh*log(x_h)+ alpha_h_am*log(am);
R = R_0+alpha_h_Yh*log(Y_h)+alpha_h_xh*log(x_h)+alpha_h_bm*log(BM);
%%%Seperation of the equation into three parts:
%% %Part 2: for j=1:1:35; %A loop for 'j' to create the first integration and summation that contains variable 'j'
kappa_computed(j)= alpha_h_xw*sqrt(x_w)-alpha_h_am.*log(am(j))-alpha_h_Ih*(log(Y_h+D_guess)-log(I_h));
fun1= @(kappa_computed)(u_h0-kappa_computed)*((kappa_computed^((N-2)/2))*exp(-kappa_computed/2))/(2^(N/2)...
*gamma(N/2))*Pram(j); %The integration of the first function contiaining k
fun2= @(kappa_computed)(v_h(j))*((kappa_computed^((N-2)/2))*exp(-kappa_computed/2))/(2^(N/2)...
*gamma(N/2))*Pram(j); %The integration of the second function contiaining k
integral_1= int(fun1,0,kappa_computed(j)); %Computing the integration of the function fun1
integral_2= int(fun2,kappa_computed(j),Inf);%Computing the integration of the function fun2
i_n_t1(j)=integral_1; %Creating an array called 'i_n_t1' to store the value of the first function 'integral_1'
i_n_t2(j)=integral_2; %Creating an array called 'i_n_t2' to store the value of the first function 'integral_2'
j=j+1; %Incrementing the value of 'j'
end
num1= sum(i_n_t1); %Sum of all the variable in the array 'i_n_t1' saved as 'num1'
num2= sum(i_n_t2); %Sum of all the variable in the array 'i_n_t2' saved as 'num2'
for i=1:1:33;
pt_1=(1-p(i))*u_h1*Prz(i); %First function that contains varaiable 'i'
sum_p1(i)= pt_1; %Creating an array called 'sum_p1' to store the value of the first function 'pt_1'
pt_2=num1*p(i)*Prz(i); %Second function that contains varaiable 'i' that is multiplied by the
%previous function 'num1'
pt_3=num2*p(i)*Prz(i); %Second function that contains varaiable 'i' that is multiplied by the
%previous variable 'num2
sum_p2(i)=pt_2; %Creating an array called 'sum_p2' to store the value of the first function 'pt_2'
sum_p3(i)=pt_3; %Creating an array called 'sum_p3' to store the value of the first function 'pt_3'
i=i+1; %Incrementing the value of 'i'
end
sum1=sum (sum_p1); %Sum of all the variable in the array 'sum_p1'
sum2=sum(sum_p2); %Sum of all the variable in the array 'sum_p2' saved as 'sum2'
sum3=sum(sum_p3); %Sum of all the variable in the array 'sum_p3' saved as 'sum3'
%% EU_h= sum1+sum2+sum3;
eqn=EU_h==R; D_computed=solve(eqn,D_guess)
end
end
end
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采纳的回答

mizuki
mizuki 2018-2-25
First, use code profiler to identify which part of your code takes much time to execute. Then, consider vectorization/using parallel computing (replace for with parfor using Parallel Computing Toolbox).
https://jp.mathworks.com/help/matlab/matlab_prog/profiling-for-improving-performance.html

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