范例1: #R program tosorta vector#Creating a vectorx <- c(7, 4, 3, 9, 1.2, -4, -5, -8, 6, NA)#Callingsort()functionsort(x) 输出: [1] -8.0 -5.0 -4.0 1.2 3.0 4.0 6.0 7.0 9.0 范例2: #R program tosorta vector#Creating a vectorx <- c(7, 4, 3, 9, 1.2, -4, -5...
(1, 2, 3) : # longer object length is not a multiple of shorter object length # 长的对象长度不是短的对象长度的整倍数 # 向量函数 # 1.数学函数 x1<-c(4,9) sqrt(x1) # [1] 2 3 # 2.排序函数 x1<-c(3,2,5,1,4) sort(x1) # [1] 1 2 3 4 5 rev(sort(x1)) # [1] 5...
Example 1 explains how to sort a vector of character stringsalphabeticallyusing Base R. For this task, we can apply thesort functionas shown below: x_sort1<-sort(x)# Sort alphabeticallyx_sort1# Print sorted vector# [1] "a" "a" "aaa" "b" "b123" "c" ...
向量:vector,是R中最重要的一个概念,它是构成其他数据结构的基础。R中的向量概念与数学中向量是不同的,类似于数学上的集合的概念,由一个或多个元素所构成。 向量其实是用于存储数值型、字符型或逻辑型数据的一维数组。 用函数c来创建向量。c代表concatenate连接 ,也可以理解为收集collect,或者合并combine。 代码语...
leaves on a later day. This is useful in our model as the price paid will be linked to the duration of stay. Now let the price per day for a booking B i be given by a pricing function pD i where D is the duration of stay. ...
Reverse/sort vector rev(), sort() Sort data frame order() Subset data frame subset() Separate data frame by category split() Training and test sets sample() Categorical variables chartr(), cut(), grep(), strsplit(), substr(), tolower(), toupper() Construct/append to a data frame c...
Seq(4) means vector from 1 to 4 (c(1,2,3,4)) whereas seq_along(4) means a vector of length(4) or 1(c(1)). 19. Explain how you can start the R commander GUI. rcmdr command is used to start the R commander GUI. 20. What is the memory limit of R? In 32 bit system me...
vector: 创建方法1 第一个参数是这个向量里面元素的类型,第二个参数是向量包含的原色个数,长度如是10个 脚本文件中要选择这句话,点击右上角run 创建方法2 变量<-赋值1:4,即从一到四 创建方法3 使用c函数,需要在这个函数中输入你需要的在这个向量中的每一个元素的内容 ...
> x+a [1] 11 12 13 14 > sum(x) [1] 10 > max(x) [1] 4 > min(x) [1] 1 > mean(x) [1] 2.5 > median(x) #中值 [1] 2.5 > var(x) #方差 [1] 1.666667 > sort(x) [1] 1 2 3 4 1. 2. 3. 4. 5. 6.
{ # 查找第x=1个细胞,找到最近的k个邻居, # 查找最多 search.k 个节点,默认 -1 # 包含距离,默认T res <- index$getNNsByVectorList(query[x, ], k, search.k, include.distance) # Convert from Angular to Cosine distance | 默认是欧拉距离,不需要转换 if (convert) { res$dist <- 0.5 * (...