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');

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Voss
Voss 2022년 7월 29일
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])
  댓글 수: 8
Khaled aL Qattawi
Khaled aL Qattawi 2022년 7월 30일
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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