R : Copyright 2005, The R Foundation for Statistical Computing Version 2.1.1 (2005-06-20), ISBN 3-900051-07-0 R is free software and comes with ABSOLUTELY NO WARRANTY. You are welcome to redistribute it under certain conditions. Type 'license()' or 'licence()' for distribution details. R is a collaborative project with many contributors. Type 'contributors()' for more information and 'citation()' on how to cite R or R packages in publications. Type 'demo()' for some demos, 'help()' for on-line help, or 'help.start()' for a HTML browser interface to help. Type 'q()' to quit R. > ### *
> ### > attach(NULL, name = "CheckExEnv") > assign(".CheckExEnv", as.environment(2), pos = length(search())) # base > ## add some hooks to label plot pages for base and grid graphics > setHook("plot.new", ".newplot.hook") > setHook("persp", ".newplot.hook") > setHook("grid.newpage", ".gridplot.hook") > > assign("cleanEx", + function(env = .GlobalEnv) { + rm(list = ls(envir = env, all.names = TRUE), envir = env) + RNGkind("default", "default") + set.seed(1) + options(warn = 1) + delayedAssign("T", stop("T used instead of TRUE"), + assign.env = .CheckExEnv) + delayedAssign("F", stop("F used instead of FALSE"), + assign.env = .CheckExEnv) + sch <- search() + newitems <- sch[! sch %in% .oldSearch] + for(item in rev(newitems)) + eval(substitute(detach(item), list(item=item))) + missitems <- .oldSearch[! .oldSearch %in% sch] + if(length(missitems)) + warning("items ", paste(missitems, collapse=", "), + " have been removed from the search path") + }, + env = .CheckExEnv) > assign("..nameEx", "__{must remake R-ex/*.R}__", env = .CheckExEnv) # for now > assign("ptime", proc.time(), env = .CheckExEnv) > grDevices::postscript("gafit-Examples.ps") > assign("par.postscript", graphics::par(no.readonly = TRUE), env = .CheckExEnv) > options(contrasts = c(unordered = "contr.treatment", ordered = "contr.poly")) > options(warn = 1) > library('gafit') > > assign(".oldSearch", search(), env = .CheckExEnv) > assign(".oldNS", loadedNamespaces(), env = .CheckExEnv) > cleanEx(); ..nameEx <- "gafit" > > ### * gafit > > flush(stderr()); flush(stdout()) > > ### Name: gafit > ### Title: Genetic Algorithm for Curve Fitting > ### Aliases: gafit > ### Keywords: nonlinear regression > > ### ** Examples > > # Single parameter, all real numbers > e <- expression( cos( theta ) + sin( theta )) > gafit( e, list( theta=3 ), step=0.1 ) # usually gets close to 3.926991 $theta [1] 3.923662 attr(,"score") [1] -1.414206 > > # Double parameter, complex numbers > sumsq <- function( x ) { sum(( Mod( x )) ^ 2 )} > freq <- exp( 1:15 ) > tpj <- 2 * pi * (0+1i) > data <- 1 / ( 10 + tpj * freq * 1e-3 ) > e <- expression( sumsq( 1 / ( R + tpj * freq * C ) - data )) > gafit( e, list( R=100, C=1e-6 ), step=0.1, maxiter=100 ) $R [1] 10.00356 $C [1] 0.001056317 attr(,"score") [1] 1.499054e-05 > > > > > ### *