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Andromeda

Andromeda is part of HADES.

Introduction

AsynchroNous Disk-based Representation of MassivE DAta (ANDROMEDA): An R package for storing large data objects. Andromeda allow storing data objects on a local drive, while still making it possible to manipulate the data in an efficient manner.

Features

• Allows storage of data objects much larger than what can fit in memory.
• Integrates with dplyr package for data manipulation.
• Objects are stored in a temporary location on the local file system.
• Ability to save and load the objects to a compressed file in a permanent location on the local file system.

Examples

library(Andromeda)
bigData <- andromeda()

# Add some 'big' data:
bigData$cars <- cars

# Manipulate using dplyr:
bigData$cars %>% filter(speed > 10) %>% count() %>% collect()
# # A tibble: 1 x 1
#       n
#   <int>
# 1    41

saveAndromeda(bigData, "bigData.zip")
close(bigData)

Technology

The Andromeda package is an R package wrapped around RSQLite.

System Requirements

Running the package requires R.

Installation

To install the latest development version, install from GitHub:

install.packages("devtools")
devtools::install_github("ohdsi/Andromeda")

User Documentation

Documentation can be found on the package website.

• Vignette: Using Andromeda
• Package manual: Andromeda manual

Support

• Developer questions/comments/feedback: OHDSI Forum
• We use the GitHub issue tracker for all bugs/issues/enhancements

Contributing

Read here how you can contribute to this package.

License

Andromeda is licensed under Apache License 2.0

Development

Andromeda is being developed in R Studio.

Development status

Beta. Use at your own risk.

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.