R for Quants, Part I.A by Brian Lee Yung Rowe.
From the post:
I’m teaching an R workshop for the Baruch MFE program. This is the first installment of the workshop and focuses on some basics, although we assume you already know how to program.
A good way to pick up R or if you already know R, some insight into the use of R in finance/financial settings.
(MFE = Master of Financial Engineering)