在预测自动图表(ggplot)中,让x轴显示日期格式为"%m/%d/%y"
而不是十进制格式可能会遇到困难。我找到了一个解决方案,在ggplot上添加了+ scale_x_date(labels = format("%m/%d/%y"))
,但这给我已有的x轴带来了错误以及无效输入。这似乎应该很简单,只需将十进制格式转换为日期格式即可,因为从头构建整个 x 轴似乎更加费力。
下面是我的代码:
library(forecast)
library(lubridate)
library(ggplot2)
library(ggfortify)
library(scales)
ActualDemand <- c(250, 800 , 500, 4000)
STRING_DATE <- c("05/13/2017","05/06/2017", "5/20/2017", "05/27/2017")
dataset <- data.frame(ActualDemand, STRING_DATE)
#convert from string to date
dataset$STRING_DATE = lubridate::mdy(dataset$STRING_DATE)
dataRowCount <- nrow(dataset)
#find start date
startDate <- NULL
for (i in 1:dataRowCount) {
if (i == 1) {
startDate <- dataset[i, 2]
next
}
compareDate <- dataset[i,2]
if (compareDate < startDate) {
startDate <- compareDate
} else {
next
}
}
#transformed set
datasetSorted <- dataset[order(dataset$STRING_DATE),]
#build time series, run outlier detection
ts <- ts(datasetSorted$ActualDemand, frequency = 52, start = c(year(startDate), week(startDate)))
print(week(startDate))
cleaned_ts <- tsclean(ts)
#forecast algorithm
tbat_model <- tbats(cleaned_ts)
tbat_forecast <- forecast(tbat_model, h=26)
autoplot(tbat_forecast)
这里是一张图表,它解释了日期但将其显示为小数点形式:
![enter image description here](https://istack.dev59.com/C8nOQ.webp)