Hello, Is it possible to perform PCA using princomp or prcomp on two-component wind data - ie wind vectors? If not, is anyone able to advise on a suitable methodology for acheiving this? My data is a time series of observations taken at different locations. Thank you in advance for any hints! Laura Laura Quinn Institute of Atmospheric Science School of the Environment University of Leeds Leeds LS2 9JT tel: +44 113 343 1596 fax: +44 113 343 6716 mail: laura at env.leeds.ac.uk