How to get the integral (function) from a vector?
3 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Dear all,
I have a vector than can be plotted and I would like to compute its integral. I don't mean the total area below, but how it evolves over the domain of integration. Basically, its "indefinite" integral. Is this possible? maybe via interpolation?
Thank you
0 Kommentare
Antworten (2)
Star Strider
am 19 Mär. 2017
I would use the cumtrapz function to integrate it. The last value is the value of the entire integral.
1 Kommentar
Image Analyst
am 19 Mär. 2017
Or perhaps cumsum() depending on your philosophy of what integration means to you, or depending on the physics of the real world situation.
Roger Stafford
am 19 Mär. 2017
I wrote a function for the File Exchange which uses third order integration methods for discrete sets of points to obtain a cumulative integral, and is therefore usually more accurate than trapz or cumtrapz. It is located at:
http://www.mathworks.com/matlabcentral/fileexchange/19152-cumulative-cubic-integration .
Siehe auch
Kategorien
Mehr zu Numerical Integration and Differentiation finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!