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T O P I C    R E V I E W
nelsonnc Posted - 11/17/2016 : 7:08:14 PM
OriginPro 2015

How come when I integrate data represented by y=x^2 from 1 to 5 Origin gives me area = 42. However, the real answer is 41.3333. This error becomes bigger as the definite integral grows. Please help to explain this. Thank you!
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nelsonnc Posted - 11/17/2016 : 7:43:13 PM
Figured it out. Origin uses trapezoid approximation. So if you want a more accurate definite integral you need more data points. For example, integrating y=x^2 from 1-4 with four data points gives 21.5 as the integration value (real value is 21). Integrating the same thing using 31 data points gives 21.005. Much closer.

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