how to extend the plot with slope of last two points till the boundary. Boundaries can be dictated by peak of adjacent plots

In the attached figure, curve 1 has to extend till boundary. How can i do that?

[Ameer Hamza]

Can you attach a sample dataset?

[Meddi Tharun]

X1 = linspace(2,3,20);
Y1 = linspace(1/1000, 1,20);

X2 = linspace(14,15,30);
Y2 = linspace(1/10000, 1,30);

Using semilogy to plot data.

[Meddi Tharun]

Sorry, for incomplete code to generate given plots.

X1 = linspace(2,3,20);
Y1 = linspace(1/1000, 1,20);
Y1Dash = flip(Y1);
X2 = linspace(14,15,30);
Y2 = linspace(1/10000, 1,30);
Y2Dash = flip(Y2);
figure;semilogy(X1, Y1Dash, "-r*");hold on;grid on;
semilogy(X2, Y2Dash, "-r*");hold off;
legend("curve1", "Curve2");

Answer 1

[KALYAN ACHARJYA]

Multiple way: One option

X1 = linspace(2,3,20);
Y1 = linspace(1/1000, 1,20);
X2 = linspace(14,15,30);
Y2 = linspace(1/10000, 1,30);
loglog([X1(1),X1],[Y2(1),Y1]);
hold on;
loglog(X2,Y2);
grid on;

[Meddi Tharun]

Say last two points making -45 degrees with X axis, with last Y value at 10^-3 . The above code will draw a vertical line(with slope -90 deg) from 10^-3 to 10^-4, but I want to extend line with same slope(-45 deg).

[Ameer Hamza]

Meddi, this is a loglog plot. It x-axis and y-axis do not have a zero. Where do you want to connect the 45-degree line on the x-axis?

[Meddi Tharun]

Touch x= 10^-4 line for this case.