My book titled Learn R …as you learnt your mother tongue is nearly complete, but the text is not yet polished.
In the fifth draft version, published through Leanpub, approximately 95% of the book content is included.
The PDF of this updated draft of the book is available at http://leanpub.com/learnr for whatever price you would like to pay for it (including for free). However, paying even as little as 1€ for your copy would go a long way towards supporting the expenses of running this web site.
Status as of 2017-03-26. Except for the chapter on data manipulation, all chapters are close to their final form.
The four packages ‘photobiology’, ‘photobiologyWavebands’, ‘ggspectra’ and ‘photobiologyInOut’, need to be all updated at the same time so as to correctly work together, and if built from sources, they must be installed in the order they are listed above.