一开始的数据表为:
读到txt里面就变成这样了
load.packages('quantmod')
data = getSymbols(tickers, src = 'yahoo', from = '1950-01-01', auto.assign = F)
write.table(data,file="T:/R存储/data/DF.txt",row.names=T,quote=F)
data<-read.table(file="T:/R存储/data/DF.txt", header=TRUE)