https://github.com/r-quantities/constants

Reference on Constants, Units and Uncertainty
https://github.com/r-quantities/constants

constants cran physics r r-package

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Reference on Constants, Units and Uncertainty

• Host: GitHub
• URL: https://github.com/r-quantities/constants
• Owner: r-quantities
• License: other
• Created: 2017-07-09T23:07:39.000Z (over 7 years ago)
• Default Branch: master
• Last Pushed: 2022-12-23T16:44:25.000Z (about 2 years ago)
• Last Synced: 2024-11-30T22:39:51.323Z (about 1 month ago)
• Topics: constants, cran, physics, r, r-package
• Language: R
• Homepage: https://r-quantities.github.io/constants
• Size: 478 KB
• Stars: 15
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.Rmd
  • License: LICENSE

Awesome Lists containing this project

README

        
---

output: github_document

---

```{r, echo = FALSE}

knitr::opts_chunk$set(

  collapse = TRUE,

  comment = "#>",

  fig.path = "README-"

)

```

#  Reference on Constants, Units and Uncertainty

[![Build Status](https://github.com/r-quantities/constants/workflows/build/badge.svg)](https://github.com/r-quantities/constants/actions)

[![Coverage Status](https://codecov.io/gh/r-quantities/constants/branch/master/graph/badge.svg)](https://codecov.io/gh/r-quantities/constants)

[![CRAN\_Status\_Badge](https://www.r-pkg.org/badges/version/constants)](https://cran.r-project.org/package=constants)

[![Downloads](https://cranlogs.r-pkg.org/badges/constants)](https://cran.r-project.org/package=constants)

The **constants** package provides the CODATA internationally recommended values of the fundamental physical constants, provided as symbols for direct use within the R language. Optionally, the values with uncertainties and/or units are also provided if the 'errors', 'units' and/or 'quantities' packages are installed. The Committee on Data for Science and Technology (CODATA) is an interdisciplinary committee of the International Council for Science which periodically provides the internationally accepted set of values of the fundamental physical constants. This package contains the "2018 CODATA" version, published on May 2019.

> Eite Tiesinga, Peter J. Mohr, David B. Newell, and Barry N. Taylor (2020). The 2018 CODATA Recommended Values of the Fundamental Physical Constants (Web Version 8.1). Database developed by J. Baker, M. Douma, and S. Kotochigova. Available at https://physics.nist.gov/cuu/Constants/, National Institute of Standards and Technology, Gaithersburg, MD 20899.

## Installation

Install the release version from CRAN:

```{r, eval=FALSE}

install.packages("constants")

```

The installation from GitHub requires the [remotes](https://cran.r-project.org/package=remotes) package.

```{r, eval=FALSE}

# install.packages("remotes")

remotes::install_github("r-quantities/constants")

```

## Example

```{r}

library(constants)

# the speed of light

syms$c0

# use the constants in a local environment

with(syms, c0)

# explore which constants are available

(lkp <- lookup("planck", ignore.case=TRUE))

idx <- as.integer(rownames(lkp))

# attach the symbols to the search path and use them explicitly

attach(syms[idx])

h

plkl

# the same with uncertainty

detach(syms[idx])

attach(syms_with_errors[idx])

h

plkl

# the same with units

detach(syms_with_errors[idx])

attach(syms_with_units[idx])

h

plkl

# the same with everything

detach(syms_with_units[idx])

attach(syms_with_quantities[idx])

h

plkl

# the whole dataset

head(codata)

# number of constants per type

library(magrittr)

codata %>%

  tidyr::separate_rows(type, sep=", ") %>%

  dplyr::count(type, sort=TRUE)

```