This tutorial is intended to introduce users quickly to the basics of R, focusing on a few common tasks that biologists need to perform some basic analysis: load a table, plot some graphs, and perform some basic statistics. More extensive tutorials can be found on the project website and via bioconductor (not covered here).
You can add more tutorial links in comments if found new pages.
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You can also look at this R tutorial http://www.burns-stat.com/pages/Tutor/R_inferno.pdf
http://www.nceas.ucsb.edu/files/scicomp/Dloads/RProgramming/BestFirstRTutorial.pdf
I found one R package SeqinR very handy in statistical computing of NGS data.
SeqinR 2.0-1: a contributed package to the project for statistical computing devoted to biological sequences retrieval and analysis
Link :http://seqinr.r-forge.r-project.org/seqinr_2_0-1.pdf
HT Sequence Analysis with R and Bioconductor tutorial at http://manuals.bioinformatics.ucr.edu/home/ht-seq
The interactive interface to learn R language http://tryr.codeschool.com/
Memory efficient string containers, string matching algorithms, and other utilities, for fast manipulation of large biological sequences or sets of sequences. http://www.bioconductor.org/packages/2.12/bioc/html/Biostrings.html
My favourate place to learn R http://www.cyclismo.org/tutorial/R/
For video R tutorial you can visit youtube http://www.youtube.com/playlist?list=PL69A9CCD816A5F3A5
R-tutor.com provide detail tutorial on R http://www.r-tutor.com/
This site’s mission is to analyze the world of analytics, with a special focus on R. R is free, open source, analytic software that is similar to the “big three” commercial packages: SAS, SPSS and Stata.
Find detailed and helpful tutorial at
http://r4stats.com/
In programming sector we generally rely on google for syntex, logic and other support. Now for R language related problems you can search on http://rseek.org/
The book "Applied Statistics for Bioinformatics using R" provide an introduction into statistics in order to solve some problems of bioinformatics.
http://cran.r-project.org/doc/contrib/Krijnen-IntroBioInfStatistics.pdf
DotPlot for Protein Sequences using R @ http://www.biogem.org/blog/dotplot-for-protein-sequences-using-r/
Frequency Plot for Protein Sequences using R @ http://www.biogem.org/blog/frequency-plot-for-protein-sequences-using-r/
Applied Statistics for Bioinformatics using R @ http://cran.r-project.org/doc/contrib/Krijnen-IntroBioInfStatistics.pdf
R tutorial by Division of Molecular Biology, Netherlands Cancer Institute http://bioinformatics.nki.nl/courses/Rstat_12_I/texts/resources/R-intro.pdf
Introduction to Feature selection for bioinformaticians using R, correlation matrix filters, PCA & backward selection http://computationalproteomic.blogspot.co.uk/2013/10/introduction-to-feature-selection-for.html?
useR! 2013 R / Bioconductor for Analysis and Comprehension of High-Throughput Genomic Data http://bioconductor.org/help/course-materials/2013/useR2013/Bioconductor-tutorial.pdf
RGL: A R-library for 3D visualization with OpenGL http://rgl.neoscientists.org/arc/doc/RGL_INTERFACE03.pdf
R by example http://www.mayin.org/ajayshah/KB/R/
You can find useful R video tutorial @ http://www.youtube.com/watch?v=iffR3fWv4xw&list=PLOU2XLYxmsIK9qQfztXeybpHvru-TrqAP
R and BioConductor tutorial for beginners http://jura.wi.mit.edu/bio/education/R2011/
The R basic tutorial at http://www.cyclismo.org/tutorial/R/
The illinois R tutorial http://math.illinoisstate.edu/dhkim/rstuff/rtutor.html
The basic stats with R at http://ww2.coastal.edu/kingw/statistics/R-tutorials/
You can also find list of several online R tutorial around the world at http://pairach.com/2012/02/26/r-tutorials-from-universities-around-the-world/
Some of useful collection of R tutorial links are available at http://cran.r-project.org/other-docs.html
SimpleR tutorials is very lucid and practical for general data analysis with R. http://cran.r-project.org/doc/contrib/Verzani-SimpleR.pdf
Useful collection of an R "meta" book can be found at http://www.r-bloggers.com/an-r-meta-book/