How to find the three extreme points of the curve as shown in the figure, and find the degrees of each angle of the triangle surrounded by the three points.

How to find the three extreme points of the curve as shown in the figure, and find the degrees of each angle of the triangle surrounded by the three points.

Answer 1

[Ameer Hamza]

Check the following functions:

findpeaks(): https://www.mathworks.com/help/signal/ref/findpeaks.html

islocalmin(): https://www.mathworks.com/help/matlab/ref/islocalmin.html

islocalmax(): https://www.mathworks.com/help/matlab/ref/islocalmax.html

[Wesley]

How to find the leftmost point and the rightmost point on the curve with MATLAB program?

[Wesley]

As shown in the figure, how to use MATLAB program to calculate the value of included angle θ?

[Ameer Hamza]

See this example.

Create a sine wave similar to one in your question

theta = linspace(0, 3*pi);
y = -sin(theta);
plot(theta, y)

Find value of theta at minimum points

idx = islocalmin(y);
theta_min = theta(idx);

Answer 2

[Wesley]