Hello, I want to calculate the variance of a subset of a matrix column.
For example, if I wanted the variance of items 3-10 in column 5. In R, this would be: x <- matrix(rnorm(100), nrow=10, ncol=10) varx <- var(x[3:10,5]) In Rcpp, I can construct a matrix object Rcpp::NumericMatrix x The var function is available thanks to the great Sugar implementation But, how can I easily reference a subset of a column to calculate the variance? Ideas? -- Noah Silverman UCLA Department of Statistics 8117 Math Sciences Building #8208 Los Angeles, CA 90095
_______________________________________________ Rcpp-devel mailing list [email protected] https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel
