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 2022-7-29

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1770855-i-wanna-do-the-plot-exactly-the-same-as-the-attached-picture-my-y-axis-should-start-from-0-0001-an

评论： Khaled aL Qattawi 2022-7-30

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');

采纳的回答

Voss 2022-7-29

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1770855-i-wanna-do-the-plot-exactly-the-same-as-the-attached-picture-my-y-axis-should-start-from-0-0001-an#answer_1017905

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])

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Voss 2022-7-29

You're welcome!

Khaled aL Qattawi 2022-7-30

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.