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

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carlos g
carlos g 2017-3-19
评论： carlos g 2017-3-20
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

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回答（2 个）

Star Strider
Star Strider 2017-3-19
I would use the cumtrapz function to integrate it. The last value is the value of the entire integral.
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Image Analyst
Image Analyst 2017-3-19
Or perhaps cumsum() depending on your philosophy of what integration means to you, or depending on the physics of the real world situation.

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Roger Stafford
Roger Stafford 2017-3-19
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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