plot with a few sample marked.

Hi Team,

May I ask your help? I would like to plot with a few samples marked out in matlab.

For example, I want to plot a cos function

x=[1:0.01:40];

y=cos(x);

plot(x,y)

But how can I mark the points with amplitude smaller than 0.5 with, for example, bubbles?

Thank you team!

Allen

Answer 1

[Star Strider]

Try these:

x= 1:0.01:40;
y = cos(x);
L1 = y <= 0.5;                                  % Logical Index: y <= 0.5

figure
plot(x,y)
hold on
plot(x(L1), y(L1), 'o')
hold off

L2 = abs(y) < 0.5;                              % Logical Index: y <= 0.5 & y >= -0.5

figure
plot(x,y)
hold on
plot(x(L2), y(L2), 'o')
hold off

Experiment to get different results.