Nothing
#############################################################################
#
# XLConnect
# Copyright (C) 2010-2024 Mirai Solutions GmbH
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
#
#############################################################################
#############################################################################
#
# Writing large datasets to Excel
#
# Author: Martin Studer, Mirai Solutions GmbH
#
#############################################################################
# Increase Java's maximum heap space;
# this option must be set before the underlying JVM is initialized
# and therefore MUST happen before XLConnect is loaded
options(java.parameters = "-Xmx1024m")
if(any(is.element(c("package:XLConnect", "package:rJava"), search()))) {
msg <- paste(
"XLConnect and/or rJava are already attached.",
"As such, a JVM instance may already be running.",
"Please restart R and set the Java parameters before XLConnect",
"or any packages that start a JVM instance are loaded.",
sep = "\n"
)
warning(msg)
}
require(XLConnect)
# Excel workbook to write
demoExcelFile <- "large.xlsx"
# Remove file if it already exists
if(file.exists(demoExcelFile)) file.remove(demoExcelFile)
# Create a large dummy data.frame
set.seed(292)
n <- 50000
dfLarge <- data.frame(
A = rnorm(n),
B = sample(letters, size = n, replace = TRUE),
C = rnorm(n) > 0,
D = rep(as.Date("2010-09-17"), n),
E = rnorm(n),
F = sample(LETTERS, size = n, replace = TRUE),
G = 1:n
)
# Load workbook (create if not existing)
wb <- loadWorkbook(demoExcelFile, create = TRUE)
# Create a worksheet called 'Dummy'
createSheet(wb, name = "Dummy")
# Write large data.frame to worksheet 'Dummy' created above
writeWorksheet(wb, dfLarge, sheet = "Dummy")
# Save workbook (this actually writes the file to disk)
saveWorkbook(wb)
if(interactive()) {
answer <- readline("Open the created Excel file (y/n)? ")
if(answer == "y") browseURL(file.path(getwd(), demoExcelFile))
}
Any scripts or data that you put into this service are public.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.