Taptly中的t代表什么? [英] What does the t in tapply stand for?

问题描述

似乎已经普遍同意，"lapply"中的l代表list，"sapply"中的s代表simple，而"rapply"中的r代表递归.但是我在"tapply"中找不到任何内容.我现在很好奇.

There seems to be general agreement that the l in "lapply" stands for list, the s in "sapply" stands for simplify and the r in "rapply" stands for recursively. But I could not find anything on the t in "tapply". I am now very curious.

推荐答案

table的立场，因为tapply是table函数的通用形式.您可以通过比较以下调用来查看:

Stands for table since tapply is the generic form of the table function. You can see this by comparing the following calls:

x <- sample(letters, 100, rep=T)
table(x)
tapply(x, x, length)

尽管显然tapply可以做的不仅仅是计数.

although obviously tapply can do more than counting.

另外，一些引用引用"table-apply":

Also, some references that refer to "table-apply":

• 现代应用的生物统计学方法

• R and S Plus companion
• Modern Applied Biostatistical Methods

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