首次添加功能包需要设定CRAN镜像库: 方法是依据提示:--- Please select a CRAN mirror for use in this session ---,在弹出的窗口中选择CRAN 镜像库 但是,如果你第一次设定的CRAN镜像库没有你所需要包,你需要指定特定的一个CRAN库地址,怎么办? 可以使用如下命令:install.packages('RMySQL', repos='http://cran.us.r-project.org'),解决问题…
Introduction R is a popular open source programming language that specializes in statistical computing and graphics. It is widely used by statisticians for developing statistical software and performing data analysis. One of R's strengths is that it…
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Data manipulation primitives in R and Python Both R and Python are incredibly good tools to manipulate your data and their integration is becoming increasingly important1. The latest tool for data manipulation in R is Dplyr2 whilst Python relies onPa…
下面通过一些例子来说明怎样使用select,参考自:LINQ Samples 1. 可以对查询出来的结果做一些转换,下面的例子在数组中查找以"B"开头的名字,然后全部转成小写输出: string[] names = { "Jack", "Bob", "Bill", "Catty", "Willam" }; var rs = from n in names where n.StartsW…