# I wanna do the plot exactly the same as the attached picture, my Y axis should start from 0.0001. and i need to draw this red dashed line from the end of plot point to x axis

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Khaled aL Qattawi on 29 Jul 2022
Commented: Khaled aL Qattawi on 30 Jul 2022
clear all;
load 'Theta_x.txt'; %correction factor 1-4
X=Theta_x;
load 'POE_Y.txt'; %probability of exceedance of the factor HEC-18 scour
Y=POE_Y;
semilogy(X,Y);
title('Correction Factor And Probability of Exceedance');
xlabel('Correction Factor Θz');
ylabel('Probability of Exceedance PoE');
X=Theta_x;
Y=POE_Y;
plot(X,Y)
grid
set(gca, 'YScale','log')
title('Correction Factor And Probability of Exceedance');
xlabel('Correction Factor Θz');
ylabel('Probability of Exceedance PoE');

Voss on 29 Jul 2022
plot(Theta_x,POE_Y)
hold on
plot([max(Theta_x) 3],[min(POE_Y) 1e-4],'--r')
grid
set(gca, 'YScale','log')
title('Correction Factor And Probability of Exceedance');
xlabel('Correction Factor Θz');
ylabel('Probability of Exceedance PoE');
xlim([0 4])
ylim([1e-4 1]) Khaled aL Qattawi on 30 Jul 2022
thanks, but i have another question, in the top we used straight line or linear process to forcast the rest of the curve, but some times this doesn't work correctly. please the attached picture for different set of data show something doesn't fit good, is there other comand this this type of fit curves. R2021b

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