摘要：1. Compressing Files at the Shell Prompt Red Hat Enterprise Linux provides the bzip2, gzip, and zip tools for compression from a shell prompt. The bzi 阅读全文

摘要：I would like to make a new data frame which only includes common rows of two separate data.frame. example: data.frame 1 data.frame2 So I want my outpu 阅读全文

摘要：Say you have A straightforward way to do the job is: More cleverly, and more conveniently if you have a lot of arguments: The Reduce function is part 阅读全文