#R comes with several built-in data sets, which are generally used as demo data for playing with R functions. #In this article, we’ll first describe how load and use R built-in data sets. #Next, we’ll describe some of the most used R demo data sets: mtcars, iris, ToothGrowth, ...
R comes with several built-in data sets, which are generally used as demo data for playing with R functions. In this article, we’ll first describe how load and use R built-in data sets. Next, we’ll describe some of the most used R demo data sets: mtcars, iris, ToothGrowth, Plant...
向量由一系列类型相同的有序元素构成;矩阵是数组(array)的一个特例:维数为2的数组;而数组又是增加了维度(dim)属性的向量。 除此之外,列表(list)和数据框(data frame)分别是向量和矩阵的泛化——列表允许包含不同类型的元素,甚至可以把对象作为元素;数据框允许每列使用不同类型的元素。对于列表和数据框,其中的元...
df 上面最后一个例子说明,data.frame是一个特殊的list,这里称为vector的扩展。 数据框和 tibble 是从列表中扩展而来 因子型向量是从整数向量中扩展而来 date date-time 向量是从数值向量中扩展而来 扩展的手段是改变属性,正如上面,list增加了一个属性”class”为”data.frame”就变成了数据框,去掉又变回了list. ...
# load packages library(prioritizr) library(prioritizrdata) library(terra)We will use the Washington dataset in this example. To import the planning unit data, we will use the get_wa_pu() function. Although the prioritizr R package can support many different types of planning unit data, ...
mkdir /data/app 0771 system system encryption=Require 相比较 Q 版本的 init.rc R 多出了 encryption=Require 属性,就是这个属性决定了 boot 阶段需要检查文件加密情况。mkdir 指令应该调用 builtins 中 do_mkdir(args) 方法 system\core\init\builtins.cpp ...
# Load the library library(bayer) ### import the built-in dataset mtcars mtcars <- datasets::mtcars ### specify the treatment variable and the covariates you want to analyze model_logistic <- bayer_logistic( data = mtcars, outcome = 'am', covariates = c( 'mpg', 'cyl', 'vs', '...
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(database)加入当前workspace的搜索路径 chooseCRANmirrors() 选择默认的R镜像网站,更新和下载包时用 update.packages() 更新包 install.packages() 安装包 installed.packages 查看已经安装的包 available.packages() 在线资源库中可下载安装的包 old.packages() 已安装而有新版本的包 new.packages() 未安装而可...