dataPreparation (version 0.4.3)

fastRound: Fast round

Description

Fast round of numeric columns in a data.table. Will only round numeric, so don't worry about characters. Also, it computes it column by column so your RAM is safe too.

Usage

fastRound(dataSet, cols = "auto", digits = 2, verbose = TRUE)

Arguments

dataSet

matrix, data.frame or data.table

cols

List of numeric column(s) name(s) of dataSet to transform. To transform all numerics columns, set it to "auto" (characters, default to "auto")

digits

The number of digits after comma (numeric, default to 2)

verbose

Should the algorithm talk? (logical, default to TRUE)

Value

The same datasets but as a data.table and with numeric rounded.

Details

It is performing round by reference on dataSet, column by column, only on numercial columns. So that it avoid copying dataSet in RAM.

Examples

# NOT RUN {
# First let's build a very large data.table with random numbers
require(data.table)
M <- as.data.table(matrix(runif (3e4), ncol = 10))

M_rouded <- fastRound(M, 2)
# Lets add some character
M[, stringColumn := "a string"] 

# And use our function
M_rouded <- fastRound(M, 2)
# It still work :) and you don't have to worry about the string.
# }