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R Data Analysis Cookbook - Second Edition by Kuntal Ganguly

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Rescaling many variables at once

Use the following function to rescale variables:

rescale.many <- function(dat, column.nos) {   nms <- names(dat)   for(col in column.nos) {     name <- paste(nms[col],".rescaled", sep = "")     dat[name] <- rescale(dat[,col])   }   cat(paste("Rescaled ", length(column.nos),      " variable(s)n"))   dat } 

With the preceding function defined, we can do the following to rescale the first and fourth variables in the data frame:

> rescale.many(students, c(1,4)) 

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