YYYYMMDD格式

Question

structure(list(date = c(20140717L, 20140611L, 20140611L, 20140704L, 
20140411L, 20140906L, 20140512L, 20140717L, 20140819L, 20140415L, 
20140812L, 20140403L, 20140424L, 20140818L, 20140922L, 20140625L, 
20141006L, 20140918L, 20140811L, 20140819L, 20140602L, 20140626L, 
20140729L, 20140624L, 20140909L, 20140705L, 20140920L, 20140515L, 
20140531L, 20140628L, 20140822L, 20140508L, 20140809L, 20140627L, 
20140727L, 20140711L, 20140714L, 20140710L, 20140403L, 20140525L, 
20140428L, 20140501L, 20140915L, 20140510L, 20140601L, 20140921L, 
20140815L, 20140610L, 20140418L, 20140812L, 20140614L, 20140814L, 
20140626L, 20140412L, 20140912L, 20140514L, 20140919L, 20140706L, 
20140411L, 20140711L, 20140624L, 20140430L, 20140521L, 20140418L, 
20140713L, 20140424L, 20140601L, 20140923L, 20140406L, 20140905L, 
20140613L, 20140412L, 20140407L, 20140402L, 20140813L, 20140903L, 
20140827L, 20140521L, 20140524L, 20140404L, 20140419L, 20140412L, 
20140902L, 20140623L, 20140925L, 20140528L, 20140731L, 20140513L, 
20140821L, 20140703L, 20140724L, 20140818L, 20140801L, 20140628L, 
20140801L, 20140521L, 20140906L, 20140725L, 20140522L, 20140927L, 
20140615L, 20140920L, 20140813L, 20140815L, 20140924L, 20140614L, 
20140912L, 20140710L, 20140807L, 20140501L, 20140420L, 20140630L, 
20140704L, 20140401L, 20140605L, 20140928L, 20140806L, 20140614L, 
20140907L, 20140704L, 20140403L, 20140804L, 20140603L, 20140728L, 
20140919L, 20140731L, 20140426L, 20140930L, 20140502L, 20140827L, 
20140815L, 20140628L, 20140902L, 20140616L, 20140613L, 20140726L, 
20140721L, 20140425L, 20140715L, 20140607L, 20140913L, 20140621L, 
20140708L, 20140427L, 20140506L, 20140425L, 20140411L, 20140615L, 
20140713L, 20140424L, 20140406L, 20140711L, 20140415L, 20140909L, 
20141004L, 20140725L, 20140602L, 20140405L, 20140525L, 20140605L, 
20140521L, 20140506L, 20140414L, 20140916L, 20140512L, 20140830L, 
20140722L, 20140711L, 20140628L, 20140613L, 20140618L, 20140719L, 
20140416L, 20140727L, 20140521L, 20140718L, 20140814L, 20140515L, 
20140501L, 20140725L, 20140507L, 20140619L, 20140525L, 20140609L, 
20140614L, 20140402L, 20140914L, 20140517L, 20140826L, 20140602L, 
20140920L, 20140718L, 20140915L, 20140715L, 20140708L, 20140419L, 
20140819L, 20140501L, 20140807L, 20140404L)), .Names = "date", row.names = c(NA, 
-200L), class = "data.frame")

此数据框的日期值为整数类。此数据集只是我数据集的一列。原始数据集还有另一个称为“总销售额”的变量。我想制作一个在X轴和Y轴上有日期的图，总销售额。

但是，因为日期被视为整数，所以情节很糟糕。所以我想让R将日期列理解为日期变量，这样我就能得到改进的情节。

怎么可能？请帮我。非常感谢你。

Answer 1

as.Date你可能会有更好的运气。如果df是数据，则可以执行

df$date <- as.Date(as.character(df$date), format = "%Y%m%d")
with(df, plot(date))

Answer 2

如果d是日期列，您可以尝试：

strptime(t(d),format='%Y%m%d')