How to connect two plot line together?

How to link the red line and blue line together?

[Walter Roberson]

hold on
plot([last_x_of_red, first_x_of_blue], [last_y_of_red, first_y_of_blue])
hold off

for appropriate values of those variables.

If you do not have those values available, then it is possible to retrieve them from the existing graphics objects, but it is easier just to use values from existing variables.

[Zeng Zhi Tee]

Thanks. How do i move the blue line so that it is directly connected to the red line without adding one more line?

[Walter Roberson]

Add last y of red minus first y of blue to all blue y.

It is difficult to tell by eye; there just might be a small x gap ae well that requires an x adjustment.

Answer 1

[Subhadeep Koley]

Hi, you can use the code below to connect the red line with the blue line directly without adding any third line.

% Demo figure for example
x =1:10;
y1 = 1:3;
figure;plot(x(1:3),y1,'r');
hold all;
y2 = 1:-1:-10;
plot(x(3:10),y2(1:8),'b');
axis([1 10 -5 5]);
hold off;
 
% Extract datas from the figure if you dont have the original data
fig = gcf;
axObjs = fig.Children;
dataObjs = axObjs.Children;
y1_fig = dataObjs(2).YData;
y2_fig = dataObjs(1).YData;
x1_fig = dataObjs(2).XData;
x2_fig = dataObjs(1).XData;
 
% Calculate the difference
differ = abs(y1_fig(end) - y2_fig(1));
y2_fig = y2_fig + differ;
 
% Plot the connected graph
figure;plot(x1_fig,y1_fig,'r');
hold all;
plot(x2_fig,y2_fig,'b');
axis([1 10 -5 5]);
hold off;

Hope this helps!