Azzera filtri
Azzera filtri

How to get the integral (function) from a vector?

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carlos g
carlos g il 19 Mar 2017
Commentato: carlos g il 20 Mar 2017
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

Risposte (2)

Star Strider
Star Strider il 19 Mar 2017
I would use the cumtrapz function to integrate it. The last value is the value of the entire integral.
  1 Commento
Image Analyst
Image Analyst il 19 Mar 2017
Or perhaps cumsum() depending on your philosophy of what integration means to you, or depending on the physics of the real world situation.

Accedi per commentare.


Roger Stafford
Roger Stafford il 19 Mar 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 .

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