How to 'divide' the x-axis based on y-values?

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A 2016-2-27

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/270363-how-to-divide-the-x-axis-based-on-y-values

编辑： Konstantinos Sofos 2016-2-28

Here's a sample equation plot:

x = linspace(0,100);
y = @(x) log(x);
plot(x,y(x),'-','LineWidth',2);

And I am attaching three pictures which represent what I would like to have. I want to 'divide' and 'categorize' the x-axis based on certain ranges of y values. Is there a way I can accomplish one or all three of the tasks outlined in attached picture?

Thank you

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Azzi Abdelmalek 2016-2-27

no attached picture

A 2016-2-27

Fixed.

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Answer 1

Konstantinos Sofos 2016-2-27

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/270363-how-to-divide-the-x-axis-based-on-y-values#answer_211483

编辑：Konstantinos Sofos 2016-2-28

在 MATLAB Online 中打开

Hi,

There are really many and nice ways to take the desire output...here just one quick solution with some patches

x = linspace(0,100);
y = @(x) log(x);
plot(x,y(x),'--','LineWidth',2);
x_lim = get(gca,'xlim')
y_lim = get(gca,'ylim')
hold on
patch([0 0 exp(3.75) exp(3.75)],[y_lim(1) y_lim(2) y_lim(2) y_lim(1) ],[1 0.5 0.2],'FaceAlpha',0.2)
text(mean([0 exp(3.75)]),mean(y_lim),'y < 3.75','rotation',90,'FontSize',14,'HorizontalAlignment','center')
patch([exp(3.75) exp(3.75) exp(4) exp(4)],[y_lim(1) y_lim(2) y_lim(2) y_lim(1) ],[1 1 0.2],'FaceAlpha',0.2)
text(mean([exp(3.75) exp(4)]),mean(y_lim),'3.75 < y < 4.00','rotation',90,'FontSize',14,'HorizontalAlignment','center')
patch([exp(4) exp(4) x_lim(2) x_lim(2)],[y_lim(1) y_lim(2) y_lim(2) y_lim(1) ],[0.5 1 0.7],'FaceAlpha',0.2)
text(mean([exp(4) x_lim(2)]),mean(y_lim),'y > 4.00','rotation',90,'FontSize',14,'HorizontalAlignment','center')
grid minor
ylabel('ln(x)')