How to calculate area under curve.

2 次查看（过去 30 天）

Sun Kyoo Choi 2020-4-13

评论： Ameer Hamza 2020-4-13

So, I am trying to get an area under curve (shaded area) shown above,

Assuing the boundry is "a" and "b", how could I calculate this area under curve?

James Tursa 2020-4-13

If you have functions defining a and b, simply integrate a - b. How are a and b defined? Functions, or data points, or ...?

Sun Kyoo Choi 2020-4-13

编辑：Sun Kyoo Choi 2020-4-13

Everything is in data points.

So, basically, I imported from the excel datasheet and extracted to MATLAB.

Also, I know a and b values.

How would the code look like?

Ameer Hamza 2020-4-13

编辑：Ameer Hamza 2020-4-13

If the curve is available as datapoints, then you can use trapz(): https://www.mathworks.com/help/matlab/ref/trapz.html

For a specific example, please share the datapoints as a mat file.

Sun Kyoo Choi 2020-4-13

Thank you:)

Ameer Hamza 2020-4-13

Glad to be of help.

KSSV 2020-4-13

编辑：KSSV 2020-4-13

Read about polyarea

MATLAB Graphics 2-D and 3-D Plots Data Distribution Plots

在 Help Center 和 File Exchange 中查找有关 Data Distribution Plots 的更多信息

Find the treasures in MATLAB Central and discover how the community can help you!

Translated by