Dear Prof. Ripley I noted a change in the behaviour of "cov", which is very reasonable:
## R version 2.7.0 Under development (unstable) (2007-11-30 r43565) > cov(as.numeric(NA), as.numeric(NA), use="complete.obs") Error in cov(as.numeric(NA), as.numeric(NA), use = "complete.obs") : no complete element pairs whereas earlier behavior was, for example: ## R version 2.6.0 Patched (2007-10-23 r43258) > cov(as.numeric(NA), as.numeric(NA), use="complete.obs") [1] NA I wanted to ask whether the effect this has on "sd" is desired: ## R version 2.7.0 Under development (unstable) (2007-11-30 r43565) > sd(NA, na.rm=TRUE) Error in var(x, na.rm = na.rm) : no complete element pairs ## R version 2.6.0 Patched (2007-10-23 r43258) > sd(NA, na.rm=TRUE) [1] NA Best wishes Wolfgang Huber ------------------------------------------------------------------ Wolfgang Huber EBI/EMBL Cambridge UK http://www.ebi.ac.uk/huber ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
