Find X Values for Graph under conditions

I have a graph showing various regions with their y values plotted against time (x values)

I want to know which times (X values) any of my lines are:

<10% of Global Line

and

>70% of global line

so then i will know the months with the large or small results.

I have shown the graph here.

[John D'Errico]

When you destroy your question like this, you insult the person who spent a lot of time in answering your question. That makes it less likely they will bother to invest the same time in you again.

[Stephen23]

Original question by Ethan Anderson:

Find X Values for Graph under conditions

I have a graph showing various regions with their y values plotted against time (x values)

I want to know which times (X values) any of my lines are:

<10% of Global Line

and

>70% of global line

so then i will know the months with the large or small results.

I have shown the graph here.

[Rena Berman]

(Answers Dev) Restored edit

Answer 1

[Ameer Hamza]

Try the following example. I have tried to create data points similar to the points in your graph

x = linspace(0, 10, 100);
global_line = x.^2.9;
y1 = 2.*x.^1.3;
y2 = 1.*x.^1.2;

figure;
ax = axes();
plot(x, global_line, x, y1, x, y2)
legend({'global', 'y1', 'y2'})

figure;
subplot(2,1,1);
hold on
plot(x, y1 < 0.1*global_line);
plot(x, y1 > 0.7*global_line);
legend({'y1 < 0.1*global line', 'y1 > 0.7*global line'});
subplot(2,1,2);
hold on
plot(x, y2 < 0.1*global_line);
plot(x, y2 > 0.7*global_line);
legend({'y1 < 0.1*global line', 'y1 > 0.7*global line'});

[Ethan Anderson]

Thanks

[Ameer Hamza]

I am glad to be of help.