The main focus of this book is to help a traditional computer programmer to master R. From a programmer perspective of theauthro, this book introduces more than 30 R packages from fundamental to higher level, presents solutions of the comprehensiveapplication of R with Java, MySQL, Redis, MongoDB, Cassandra, Hadoop, Hive, Hbase, etc, which is strong in practice andoperability. This book may help readers appreciate the charm of R in all industries and all fields, and show a picture of strong vitalitywhen combining R with other computer languages and help readers break through the bottleneck.