Change Google colaboratory default language as R

Option1. Create notebook with R language from URL endpoint

Below link enables blank noteboook with default kernel language R.

https://colab.research.google.com/notebook#create=true&language=r

Option2. Change notebook kernel spec on Google Colab

For setting Google Colaboratory default language as R (from python), I tweaked the .ipynb file as below.

1. Open Google colaboratory project page (.ipynb)
2. File > Download > Download .ipynb
3. Open the ipynb by text editor (in my case I used vim editor on Mac terminal) and change below lines:

Before

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{
  "nbformat": 4,
  "nbformat_minor": 0,
  "metadata": {
    "colab": {
      "name": "Project_r.ipynb",
      "provenance": []
    },
    "kernelspec": {
      "name": "python3",
      "display_name": "Python 3"
    },
    ...
}

After

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{
  "nbformat": 4,
  "nbformat_minor": 0,
  "metadata": {
    "colab": {
      "name": "Project_r.ipynb",
      "provenance": []
    },
    "kernelspec": {
      "name": "ir",
      "display_name": "R"
    },
    ...
}

4. Upload the changed .ipynb to the Google Colaboratory page.

Then you can call R command on Google colaboratory without typing %%R before every execution.

Then you can run R command and packages on .ipynb file like:

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library(tidyverse)

References

• Google Colab with R - Coding R for Data Science (tidyverse) on Google Colab Tutorial
• Rによる統計入門|Google ColaboratoryでR言語を使う