How to get the integral (function) from a vector?
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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
回答（2 个）
Star Strider
2017-3-19
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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
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.
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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