Hi,(adsbygoogle = window.adsbygoogle || []).push({});

I was wondering if anyone can point me to a general treatment of errors when doing numerical integration of measured variables?

My problem is that I am integrating force with respect to displacement (of a piston) in an attempt to calculate work...and getting some impossible numbers. The force and displacement values are sampled from analogue transducers in a laboratory set-up. The data acquisition system samples each signal sequentially and creates trends with their own unique time bases. The frequency of sampling varies somewhat and I have no control over this. Anyway, to do the integration I then need to interpolate the acquired values at common points in time (e.g. every 0.1 s). I therefore have multiple sources of error - the initial measurement (instrument calibration), the sampling, the quantisation and finally the interpolation. I'm ignoring rounding and truncation in software for the time being.

I suspect these errors are adding up with adverse consequences, but I can't figure out how to derive an expression incorporating all the variables to assess their impact. This must be a common problem, but my old uni textbooks and Google haven't been much help. Any advice is much appreciated,

PorridgeMan.

**Physics Forums - The Fusion of Science and Community**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Numerical integration and errors

Can you offer guidance or do you also need help?

Draft saved
Draft deleted

Loading...

Similar Threads - Numerical integration errors | Date |
---|---|

I Gaussian Quadrature on a Repeated Integral | Nov 28, 2017 |

I Decomposing a Function for Numerical Integration | Sep 24, 2016 |

Numerically integrate bivariate function | Feb 12, 2016 |

Problem with numerical integration of error function | Oct 6, 2011 |

What is an easy way to calculate numerical integration uncertainty/error | Jun 16, 2011 |

**Physics Forums - The Fusion of Science and Community**