Hi Spencer, yes thanks it does help. In short I have resolved the issue. In length, not directly, as I have not found a way to ask R to actually plot frequency vs. period directly, I have scoured the R help pages and Venebles & Ripley but the call to R "spectrum()" or "periodogram()" generates error messages if I try to enhance or change the plot!
I did find that you can install the library packages "growth" and "rmutil" and then use the function "pergram" that gives you the output of the PSD in a matrix which I have then transformed to give me the period (1/frequency). Thankyou very much for replying and for the advice Best wishes Tom ........................................................................... Dr Tom C Cameron office: 0113 34 32837 (10.23 Miall) Ecology & Evolution Res. Group. lab: 0113 34 32884 (10.20 Miall) School of Biological Sciences Mobile: 07966160266 University of Leeds email: [EMAIL PROTECTED] Leeds LS2 9JT LS2 9JT ______________________________________________ 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
