Today Simon Mullis wrote: > Hello all, > > Am I right in thinking there is no easy way to do a square root in RPN? > > I want to calculate a Standard Deviation of a set of values. Anyone done > this already? > > I want to use RPN because I'd like to superimpose the value of the Std Dev > on the graph of the normal values. > > Or should I just use Perl and RRDs::fetch ? > Thanks
SM, look at the code for rrd_graph.c adding new functions to RPN is pretty straight forward ... compare with the SIN function for example tobi -- ______ __ _ /_ __/_ / / (_) Oetiker @ ISG.EE, ETZ J97, ETH, CH-8092 Zurich / // _ \/ _ \/ / System Manager, Time Lord, Coder, Designer, Coach /_/ \.__/_.__/_/ http://people.ee.ethz.ch/~oetiker +41(0)1-632-5286 -- Unsubscribe mailto:[EMAIL PROTECTED] Help mailto:[EMAIL PROTECTED] Archive http://www.ee.ethz.ch/~slist/rrd-users WebAdmin http://www.ee.ethz.ch/~slist/lsg2.cgi
