R is a computer language for statistics and graphics. It includes many computing tools (matrix computation, optimisation, ...) as well as a simple interface for compiled code (e.g., C, C++, Fortran). Thousands of contributed packages on CRAN (Comprehensive R Archive Network) and other repositories over the Internet provide a vast number of possibilities for statistics, graphics, and computing.
A feature of R is that it is software for a very wide
range of users: this may be confusing for beginnners who just want
to do their analysis of variance or t-test and have heard that R is
free. To help newbies in R, I have written
R for Beginners a document available in
seven languages: see my publications page.
I am the maintainer and main author of three packages available on CRAN:
I am also the maintainer of the package distory distributed on CRAN, and two other packages distributed on GitHub.
My teaching page contains several documents and slides related to R.
If you like to test all the fonts available in your office text editor (I do it sometimes with LibreOffice), the TeX Users Group (TUG) has a page with a catalogue of fonts so you can check them out easily:
Another major difficulty with LaTeX is writing appropriate BiBTeX style files (.bst) to format your bibliography accordingly to the journal where you want to submit your papers. However, the situation has improved remarkably in the past few years. Several publishers provide templates, including examples and .bst files. Tom Schneider maintains a very useful (and very long) page on LaTeX and BiBTeX:
The top of this page has tables listing .bst files and publishers accepting LaTeX submission (be aware that you submit directly the .tex files, not the PDF). In all cases, check-out the web site where you intend to submit your work (preferably before writing you paper).
Another very nice page by Sébastien Merkel gives a concise cheat-sheet for BiBTeX (in French and in English):
Finally, if you are brave enough to hack .bst files (or write your own), you can find some useful tricks in these PDF slides by Piet van Oostrum:
http://www.ntg.nl/bijeen/pdf-s.20031113/BibTeX-tutorial.pdfI use PPower4 for my slides. Though this package is relatively old, it is still available (though apparently no more supported). I found it to be more flexible than more recent packages for slides (e.g., Beamer). The 'pgf' package helps to insert pictures in a more flexible way than the traditional \includegraphics. See the page of PPower4 on CTAN:
https://ctan.org/pkg/ppower4And finally, the indispensable (and regularly updated) Comprehensive LaTeX Symbol List: