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A brief presentation of the site

If you are interested in the R language, data visualization, data analysis, the daylight spectrum, measurement of light and optical properties or in how plants perceive and respond to the characteristics of the light environment in which they grow, you are likely to find something of interest among the more than a hundred pages and posts at this site.

I have written the contents of this web site over many years. I continue adding new material but it is also a compilation, with some updates, of what I have written on earlier web sites that do no longer exist or may soon be terminated. Because of this this site is organized in sections, each one with its own index page (see contents menu entry).

Recently published content is showcased below.

The R blog contains short articles, mostly news that once published are not revised, or revised during a few months, except for mistakes. In this section I publish condensed news about package updates, and R-related books and articles published elsewhere.

The R pages are informative articles and tutorials that once published I update as needed to keep them useful and relevant. Many of the pages are based on material prepared for courses or talks and republished in a different format. In general, the focus is not on cookbook-style R code examples.

The R gallery contains pages that demonstrate use cases of R and R packages, mostly my own packages. Each page contains multiple R-code recipes for ploting and computations for specific tasks, cookbook style. The aim is to provide additional recipes complementing those in the well known Cookbook for R website. Once pages in this section are published they are updated as needed to keep them useful and relevant, and possibly to expand them.

These posts are related to research with plants and crops in the research group I lead: Sensory Ecology and Photobiology of Plants (SenPEP).

The best way to remain up-to-date about the contents of this site is to use an RSS feed reader such as NetNewsWire (iPhone) or a browser add-on like “FeedBro” (Firefox) and subscribe to the feeds you are interested in. The RSS entry in the site’s main menu contains links to three separate feeds, for the Blog, Pages and R Gallery sections of the website.

I publish occasionally announcements through Mastodon. I use hashes to differentiate posts by subject so that you can follow what you are interested in without cluttering your Mastodon Home. You can see my first post through Mastodon or my first toot.

You can visit my Mastodon profile at https://mastodon.social/@aphalo. I am no longer using Twitter/X or Facebook.

These index pages list a selection of posts that are already listed in other index pages. They are only a convenience.

The site is searchable, and the search is based on a static index. In other words, the search is fast and local.

1 Contents

Opens a nested menue that links to the tables of contents of the different sections.

2 R packages

This menu entry gives access to the documentation in HTML format for all the R packages that I actively maintain.

Under development versions of the packages that I maintain are available at a CRAN-like repository. I addition to the packages published in CRAN, a few packages are only available through this repository.

3 Books

This menu entry gives access to pages related to books I have written or edited about R and/or photobiology.

4 Data

Here you will find data acquired at a weather station that I manage. The station is located in the Viikki Campus of the University of Helsinki, in Helsinki, Finland. There is also a description of the station equipment and the variables in the data.

5 About

Pages with additional information about the site and myself.

6 Feeds

Each index page generates a matching RSS feed that can be followed with any compatible feed reader.