Question

I initially wrote a script that does calculation running through ~70k iterations, I was using rbind to stitch the outcomes together (1 iteration can result in outcome with 0 to many rows, so I don t think pre-allocating the output makes sense). To speed things up I ve split this into 4 separate scripts that each handle 25% of the iterations in separate sessions and write their solutions (each between 150k-400k rows) to csv, which are all read back into a single script to bind the solutions together

但是,Im在一栏中存在问题,它包含一个日期,即将其重新储存为“d-mm-y”......,第1、第2和第4版,按预期阅读,将其重新储存为特性类型,由我罚款。但是,第3条在日期一栏中作为识别剂添加了“00”插图/插图。

缩略语象有不同的数据类型一样,我可以通过将colClasses = c(DATE=“character”)列入备案3,但我非常理解WHY的发生,并假设我可能调整一些标准?

Answer 1

这个问题似乎在于原始数据的日期格式,所有数据都是通过数据通过。提交卷宗的日期

由于@thelatemail for Pointing: “recent edition of fread auto guessdate forms - - “bit64:integer64, IDate, and POSIXct services are also found and Read direct without need to beread as nature before 2007,

我仍不相信,为什么只有4个中有1个被解读为日期,而其他则被视为特性,但我的假设是,“d-mm-yy”格式含糊不清,难以解释,因此应尽可能避免。

Answer 2

现在,你可以:

options(datatable.old.fread.datetime.character=T)

在 NEWS file ,用于数据。 “与以前一样,移徙选择数据表.old.fread.datetime.character仍可被赋予图瓦卢联邦统计局,以重述旧的特征行为。这一移民方案是临时性的,将在不久的将来取消。

但截至第1.14.8版(目前的非发展中国家版本),这一选择仍然有效。

阅读日期作为特性将使数据稳定:阅读速度放慢,使记忆使用率更高,但如果你确实需要这样做的话。

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