摘要： a = c(175, 168, 168, 190, 156, 181, 182, 175, 174, 179)b = c(185, 169, 173, 173, 188, 186, 175, 174, 179, 180)x<-t.test(a,b)str(x)class(x)> str(x)List 阅读全文

摘要： Treat it as a data.frame:set.seed(1)x <- sample(30, 100, TRUE)summary(x)# Min. 1st Qu. Median Mean 3rd Qu. Max. # 1.00 10.00 15.00 16.03 23.25 30.00 s 阅读全文

摘要： a = matrix( c(2, 4, 3, 1, 5, 7), # the data elements nrow=2, # number of rows ncol=3, # number of columns byrow = TRUE) # fill matrix by rows class( ( 阅读全文

摘要： require(reshape2)x = data.frame(subject = c("John", "Mary"), time = c(1,1), age = c(33,NA), weight = c(90, NA), height = c(2,2))x subject time age wei 阅读全文

摘要： read.csv in R doesn't import all rows from csv file The OP indicates that the problem is caused by quotes in the CSV-file. When the records in the CSV 阅读全文

摘要： union 求两个向量的并集集合可以是任何数值类型union(x=1:3, y=2:5)[1] 1 2 3 4 5union(x=c("abc", "12"), y=c("bcd", "efg"))[1] "abc" "12" "bcd" "efg"setdiff 求向量x与向量y中不同的元素(只取 阅读全文

摘要： Examples: print(match(5, c(1,2,9,5,3,6,7,4,5)))[1] 4 5 %in% c(1,2,9,5,3,6,7,4,5)[1] TRUE 8 %in% c(1,2,9,5,3,6,7,4,5)[1] FALSE > v1 <- c("a1","b2","c1" 阅读全文

摘要： I think I get what you mean. Let's say for example you want the right-most \ in the following string (which is stored in cell A1): Drive:\Folder\SubFo 阅读全文

摘要： REF: https://stackoverflow.com/questions/16391208/print-a-files-last-modified-date-in-bash 阅读全文

摘要： IQR(Inter-Quartile Range)在统计中叫内距.内距又称为四分位差.具体如下：内距IQR即Inter-Quartile Range, 这是统计技术上的名词.内距又称为四分位差,是两个四分位数之差,即内距IQR=高四分位数—低四分位数.标准化四分位距——对一组按顺序排列的数据,上四分 阅读全文