plotting issue in MATLAB
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plot(r(i),z(n+1), '-b'); does not plot any points but plot(r(i),z(n+1), '.b'); does. I cannot figure it out why. Can anyone here help me regarding this?
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Walter Roberson
2023-9-14
plot() by default does not draw any markers.
plot() only creates lines when there are two or more adjacent finite points.
plot(r(i),z(n+1), '-b');
cannot create a line because it only has a single point. Or you could think of it as producing a line of size zero. And it doesn't create a marker because you did not ask for a marker.
plot(r(i),z(n+1), '.b');
asks for a marker (but not for a line). When you specify a marker then by default lines are turned off. If you wanted both you need to ask for both, such as
plot(r, z, '-.b')
Much of the time you should avoid plotting each point as it is calculated, and instead store the values and plot() after the end of the loop.
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