move <- function(x, ...) UseMethod('move') # 后面的字符串必须与前面函数名相同 # 定义各种方法 move.default <- function(x) print('I am moving') move.dog <- function(x) print('I am running') move.fish <- function(x) print('I am swimmning') # 创建变量并指定类 onedog <- "a...
你可以认为属性就是用来给对象添加metadata的键值对。获取或者修改对象的单个属性可以用attr()函数,获取和设置对象的所有属性可以分别用attributrs()和structure()函数。 a <- 1:3 attr(a, "x") <- "abcdef" attr(a, "x") #> [1] "abcdef" attr(a, "y") <- 4:6 str(attributes(a)) #> List...
structure函数创建的是带有一组属性的R对象。第一个参数是一个R对象或对象的取值,剩下的参数是你想添加给这个对象的属性。属性名称可以任意设置。structure会将你提供的参数名称作为属性名称赋给该对象。 play<-function(){symbols<-get_symbols()structure(score(symbols),mysymbols=symbols)}two_play<-play()two_...
structure()R语言中的函数用于通过改变维度来获取或设置向量的结构。 用法:structure(vec, dim) 参数: vec:向量 dim:新维度 范例1: # R program to get# thestructureof a Vector# Creating a Vector# of Numbersx1<- c(1:10)structure(x1)# Creating a vector# of stringsx2 <- c("abc","cde","d...
function(x){if(nrow(x)>2)bind_rows(x %>% head(1),x %>%tail(1)) else x } ) %>%对函数的传递 2 read_*读入数据 2.1 read_*文档 在学长的笔记中指出:Yihui在blogdown包中采用read_utf8{xfun}而非read_file,保证了代码好似utf-8的格式录入,read_utf8虽然不是Tidyverse集成包中的函数,但是很...
在这个分析中,我们将看到如何创建层次聚类模型。目的是探索数据库中是否存在相似性组,并查看它们的行为。 例如,我们将使用Doubs数据库,该数据库基于从法国Doubs河中提取的鱼类样本的物理特征。其目的是查看样本的行为以及如何对数据进行分组。 1- 数据准备
binary_oversample <- function(train_df, X_train, y_train, class_Attr = "Class"){ negative_num <- sum(y_train == 0) # Compute the number of the negative class positive_num <- sum(y_train == 1) # Compute the number of the positive class difference_num <- abs(negative_num - ...
stop('please recheck your data structure , you must keep a equal num of the row and col') } } sum_vector_row = data %>% apply(2,sum) decide_matrix = data %>% apply(1,function(x) x/sum_vector_row) weigth_vector = decide_matrix %>% apply(2,su...
Have a look atthe structure(结构) 100xp Another method that is often used to get arapid(迅速) overviewof your data is the functionstr(). The functionstr()shows you the structure of your data set. For adata frame it tells you:
In general, whenever you have any doubt about how a particular data type or data structure is being used in R, use the str() function to get the internal structure and type of the R object. The result of the function is printed to the R console and is also available in the query re...