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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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');
Theta_x = readmatrix('Theta_x.txt');
POE_Y = readmatrix('POE_Y.txt');
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');

Accepted Answer

Voss
Voss on 29 Jul 2022
How about this?
Theta_x = readmatrix('Theta_x.txt');
POE_Y = readmatrix('POE_Y.txt');
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])
  8 Comments
Khaled aL Qattawi
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.

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