Skip certain values in plot and connect adjacent points

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Daniyar Saparov
Daniyar Saparov 2019-8-27
编辑： Adam Danz 2019-8-27
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.

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采纳的回答

Adam Danz
Adam Danz 2019-8-27
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)
  2 个评论
Daniyar Saparov
Daniyar Saparov 2019-8-27
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!

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