rate activation rate basic rate event count rate-adaptive rate-limiting factor rate-of-lossofcoolant rate-of-penetrationlo rate-pressure product rateable charges rateau formula rateconstructionunitr rated contact voltage rated discharge capac rated frequency of a rated input rated rotor speed rated se...
factor(x, levels = sort(unique(x), na.last = TRUE),labels = levels, exclude = NA, ordered = is.ordered(x)) 其中x是数据 levels是因子水平向量 labels是因子的标签向量 exclude表示需要从向量中剔除的值 order为因子的排序 col <- c("B", "B", "R", "Y", "B", "Y", "Y", "R", ...
gender_fac <- factor(gender_char) 1. 2. 3. 4. 5. 2. 更改因子水平 通过指定levels参数来更改因子被创建时水平的先后顺序 factor(gender_char, levels = c("m", "f")) 1. 如果想在因子创建之后再改变因子水平的顺序,就再次使用factor函数,这时它的参数是当前的因子(而不是字符向量) factor(gender_...
ggplot(mtcars,aes(x=reorder(gear,disp), y= disp)) + geom_boxplot() + labs(title = "图1") ggplot(mtcars,aes(x=factor(gear), y= disp)) + geom_boxplot() + labs(title = "图2") 2 去重 2.1 unique 单向量/多列完全重复去重 总结:unique中,R中默认的是fromLast=FALSE,即若样本点重复...
rate-limiting factor rate-of-lossofcoolant rate-of-penetrationlo rate-pressure product rateable charges rateau formula rateconstructionunitr rated contact voltage rated discharge capac rated frequency of a rated input rated rotor speed rated seat rated short-circuit b rated static longitud rated tip...
因子(factor)是名义型变量或有序型变量 标量(scalar)只含有一个元素的向量 向量型(vector):存储数值型、字符型或逻辑型数据的一维数据。包括:逻辑型、整型、数值型、复数型和字符型。 矩阵,是二维数组,只是每个元素都拥有相同的模式(数值型、字符型或逻辑型)。
语句status <- factor(status, ordered=TRUE)会将向量编码为(3, 2, 1, 3),并在内部将这些值关联为1=Excellent、2=Improved以及3=Poor。 字符型向量,因子的水平默认依字母顺序创建。你可以通过指定levels选项来覆盖默认排序。例如: status <- factor(status, order=TRUE,levels=...
Factor w/ 3 levels "4","5","3": 1 1 1 3 3 3 3 1 1 1 ... - attr(*, "scores")= num [1:3(1d)] 326 123 202 ..- attr(*, "dimnames")=List of 1 .. ..$ : chr [1:3] "3" "4" "5" > str(factor(gear)) ...
install.packages("randomForest") library(randomForest) # 下载泰坦尼克号幸存者数据集data<- read.table("http://math.ucdenver.edu/RTutorial/titanic.txt", h=T, sep="\t") # 将Survived列转为yes/no因子data$Survived<- as.factor(ifelse(data$Survived==1, "yes", "no")) # 拆分为训练集和测...
类别(名义型)变量和有序变量在R中称为因子(factor)。 函数factor()或者as.factor()以一个正整数向量的形式存储类别值,如下所示: 这时会自动按照字母和数字的顺序映射类别与数字,并存储为(1,2, 4, 3, 2)。若是存储有序变量,也即水平的顺序是有意义的,这时候需指定参数ordered=TRUE:...