[英]make new columns with for loop but i want to add “.Corr” to each name of these new columns in the loop. How can i do that?
最后三列是从循环中生成的。 $PFN Date Open High Low Close Volume Adjusted Return HYG TLT SPY 1 2020-01-02 10.62 10.62 10.58 10.58 267700 10.231670 NA 0.6840342 0.043489 0.656935 2 2020-01-03 10.59 10.69 10.58 10.68 351800 10.328378 0.94518 0.6840342 0.043489 0.656935 3 2020-01- 06 10.66 10.73 10.66 10.73 318400 10.376730 0.46816 0.6840342 0.043489 0.656935 4 2020-01-07 10.71 10.71 10.76 10.76 10.70 10.71
但我想实现这个
$PFN Date Open High Low Close Volume Adjusted Return HYG.Corr TLT.Corr SPY.Corr 1 2020-01-02 10.62 10.62 10.58 10.58 267700 10.231670 NA 0.6840342 0.043489 0.656935 2 2020-01-03 10.59 10.69 10.58 10.68 351800 10.328378 0.94518 0.6840342 0.043489 0.656935 3 2020-01-06 10.66 10.73 10.66 10.73 318400 10.376730 0.46816 0.6840342 0.043489 0.656935 4 2020-01-07 10.71 10.76 10.70 10.71 261500 10.357388 -0.18639 0.6840342 0.043489 0.656935
一切都应该在 for 循环中完成!
如果数据集对象被命名为“PFN”、“PFP”等, get
对象的值,然后将这些列重命名为首选值并将其重新assign
(不建议在全局环境中创建多个对象)。 最好将其列在list
objs <- c('PFN', 'PFP')
for(obj in objs){
tmp <- get(obj)
nm1 <- c("HYG", "TLT", "SPY")
names(tmp)[names(tmp) %in% nm1] <- paste0(nm1, ".Corr")
assign(obj, tmp)
}
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