[英]I want to arrange my R code output(dataframe)containing multiple rows and columns in SQL table
[英]I want to add multiple columns in my R dataframe using for loop
我想添加名称为day2,day3到day19的列,我尝试了此代码,但无法正常工作
for(i in 2:19)
{
n=paste("day",i,sep="")
mydata<-mutate(mydata,n=SMA(Price,i))
}
我得到的列名是n而不是n的值
假设您的data.frame是xdf
xnew <- paste("day", 1:19, sep="")
xdf[,c(xnew)] <- 0 # column type will be numeric. change to "" if you wish to make character
names(xdf)
你会得到这个
[1] "myid" "myday" "myvol" "day1" "day2" "day3" "day4" "day5" "day6" "day7" "day8" "day9" "day10" "day11" "day12" "day13" "day14" "day15" "day16"
[20] "day17" "day18" "day19"
很高兴为您提供新手帮助。
请尝试以下:
library(TTR);
data(ttrc);
# Assume mydata is ttrc
mydata = ttrc;
# SMA for 5 days - you can also loop it
n = paste("day",5,sep="")
# To assign to mydata use !!
mydata = mutate(mydata,!!n := SMA(Close,5) )
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