%compare FIL with python script
function diff_plot_py(fs,iir_out, Script_out,title1,title2,a,amp,edge,fileID)
%输入数据长度不等时取其公共部分
N = min(length(iir_out),length(Script_out));
iir_out = iir_out(1:N);
Script_out = Script_out(1:N);

diff = (iir_out - Script_out)/amp;%求差，并归一化

n = (0:1:N-1)/fs;
%找出关心的数据点
n_edge = find(n>=edge-1e-12);%edge代表下降沿
n50 = find(n>=edge+20e-9-1e-12);%下降沿后20ns
n20_40 = find((n>=edge+20e-9-1e-12) & (n<=edge+40e-9+1e-12));%下降沿后20ns到40ns
n1000 = find(n>=edge+1000e-9-1e-12);%下降沿后1us
n1000_1100 = find((n>=edge+1000e-9-1e-12) & (n<=edge+1100e-9+1e-12));%下降沿后1us到1.1us

ne = find((abs(diff)>=1e-4) & (abs(diff)<1));%误差小于万分之一的点
ne(1) = 1;

window_length = 100e-9*fs;
diff_mean_window = movmean(diff,window_length);
diff_std_window = movstd(diff,window_length);
n_mean_window = find((abs(diff_mean_window)>=1e-4) );%100ns窗，误差均值小于万分之一点
n_std_window = find((abs(diff_std_window)>=1e-4) ); %100ns窗，误差方差小于万分之一点
n_common = max(n_mean_window(end),n_std_window(end));
%原始数据作图
tiledlayout(2,1)
ax1 = nexttile;
plot(n,iir_out,n,Script_out)
legend(title1,title2)
xlabel('t/s')
xlim(a)
grid on
hold on

%差值做图
ax2 = nexttile;
plot(n,diff)
xlabel('t/s')
title('diff')
grid on
hold on
xlim(a)
linkaxes([ax1,ax2],'x');

plot_p = @(x)[
    plot(n(x),diff(x),'r*');
    text(n(x), diff(x)+diff(x)*0.1, ['(',num2str(n(x)),',',num2str(diff(x)),')'],'color','k');
    ];

ne(1) = 1;

% [diff_max,R_mpos] = max(abs(diff));%误差最大值
% plot_p(R_mpos);

if a(2) <= 5e-6
    plot_p(n_edge(1));%下降沿
    % plot_p(R_mpos);
elseif a(2) == 20e-6
    plot_p(n50(1));   %下降沿20ns
    plot_p(n1000(1)); %下降沿1us
    plot_p(ne(end));  %误差小于万分之一
    fprintf(fileID,"Falling edge of 20ns~40ns mean :%.4e\t std :%.4e\t",mean(diff(n20_40)),std(diff(n20_40)));
    fprintf(fileID,"Falling edge of 1us~1.1us mean :%.4e\t std :%.4e\t",mean(diff(n1000_1100)),std(diff(n1000_1100)));
    % fprintf("The error after falling edge of 1us is:%.4e\t",diff(n1000(1)));
    % fprintf("The time of erroe less than 1e-4 is :%.4e us\n",(n(ne(end))-n(n_edge(1))));
    fprintf(fileID,"The mean and std stably less than 1e-4 is :%.4e s\n",(n(n_common)-n(n_edge(1))));
end