WebAug 29, 2024 · This post explains a combined usage of split (), lapply () and do.call () R functions, so called Split-Apply-Combine approach. These are frequently used for group based calculations such as weighted average or aggregation. It will be useful when complicated user-defined function is applied differently to each group such as currency. WebValue. For mclapply, a list of the same length as X and named by X. For mcmapply, a list, vector or array: see mapply. For mcMap, a list. For pvec, a vector of the same length as v.
R语言 tapply()用法及代码示例 - 纯净天空
WebFeb 14, 2024 · The sapply () function in the R Language takes a list, vector, or data frame as input and gives output in the form of an array or matrix object. Since the sapply () function applies a certain operation to all the elements of the object it doesn’t need a MARGIN. It is the same as lapply () with the only difference being the type of return object. WebMar 18, 2024 · 数据挖掘第一天(r语言基础) 今天是第一天学习数据挖掘,先从r语言开始。报名之前我有畏难情绪,因为知道有零代码数据挖掘之说,想偷懒。后来想到如果需要深入学习,线上分析软件应该不够用,同时想在... frank henry jr obituary
R语言 apply,sapply,lapply,tapply,vapply, mapply的用法
WebApr 13, 2024 · R语言apply、lapply、sapply、tspply函数 在描述性统计量方面,R语言提供了数不胜数的选择,这里主要讲apply、lapply、sapply、tspply函数的用法和区别。这四者 … WebJan 22, 2024 · 在任何编程语言中,函数都是必不可少的。函数是一个代码块,它可以被调用来执行编程中的特定操作。 在 r 中,我们有内置的函数,也有用户定义的函数。我们也可以直接将函数应用于一个或多个参数的列表或向量。 在本教程中,我们将使用下面的向量和函 … Web总结一下,apply函数是一个把某一命令应用在目标矩阵的每一个元素上的集合运算命令。 致谢lapply与sapply. 介绍了大哥apply,当然也不能忘了另外两个重要成员:lapply与sapply … blazer collection arrow shirt