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邮件地址的频数统计
source link: https://yihui.org/cn/2009/04/frequency-of-email-addresses/
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邮件地址的频数统计
谢益辉 / 2009-04-13
受 Zhang H. 启发，自个儿看了看 Gmail 邮箱的联系人，导出为 Outlook 的 CSV 格式，然后读进 R，用正则表达式去掉 *@部分，table () 了一下。Hotmail 邮箱的频数比我想象的要高，然后也没想到中科院植物所也排在前面，估计是那次 R 会议所致。剩下的联系人就分布在五湖四海了，结果请看：
x = read.csv("contacts.csv", stringsAsFactor = FALSE)
y = gsub("^.*@", "", x$E.mail.Address)
y = sort(table(y))
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