Skip certain values in plot and connect adjacent points

Hello,

I am trying to plot some data with a regular "plot" function, but I want to skip some certain values and connect the adjacent points of that skipped value. For example, I want to plot something like this:

x = 0:pi/10:2*pi;
y = sin(x);
plot(y)

and skip for examples values of x at points pi/2 or 3*pi/2, but connect the points around this skipped values. I tried:

x = 0:pi/10:2*pi;
y = sin(x);
plot(y(x~=pi/2))

but, it is not doing what I exactly want to do. I want the spacing of x values remain the same, except the skipped point, where the connected adjacent points obviously will have more separation than other pair of points. How can I do this kind of plot? Many thanks in advance.

Answer 1

[Adam Danz]

How to skip x values.

x = 0:pi/10:2*pi;
skipPoints = [pi/2, 3*pi/2]; % list points to skip
x(ismember(x,skipPoints)) = []; % remove skip-points

% now compute Y with only the desired points
y = sin(x);
plot(x,y)

If you'd rather not connect the points adjacent to the skipped values, you can replace the skipped values with NaN

x = 0:pi/10:2*pi;
skipPoints = [pi/2, 3*pi/2]; % list points to skip
x(ismember(x,skipPoints)) = NaN; % Replace with nan

% now compute Y with only the desired points
y = sin(x);

plot(x,y)

[Daniyar Saparov]

Hello Adam,

Many Thanks! The first one worked perfectly for me. Actually, I came up with another solution, assigning an average value of adjacent points to the skipped value, such as:

y(x==pi/2) = (y(x==pi/2-pi/10)+y(x==pi/2+pi/10))/2;

But your method is way better and saves a lot of space and time. Many thanks!

[Adam Danz]

Glad I could help!