On Sun, 12 Feb 2006, oliver wee wrote: > Hello, I need some help in differencing a time series. > > For example I have a data set with 100 data points. I > need to create a new dataset that consists of the > difference of two succeeding data points. > > something akin to this formula in java: > for (int i = 0, i < 100, i++) > { > newdataset[i] = olddataset[i] - olddataset[i-1] > }
Surely that is incorrect: what is olddataset[-1] in Java? R does this right in diff(). -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html