为什么 fread 不接受 skip 命令？

Question

我有一个 .txt 数据集，其中前 12 行是文本，后跟 2 个空行，然后是数据

DATE           HEIGHT    INPUT     OUTPUT  TESTMEASURE
01/01/1933  NO RECORD   NO RECORD   MISSING     MISSING
01/02/1933  NO RECORD   NO RECORD   MISSING     MISSING

但是当我做一个

dat <- fread('data.txt'),

它跳过 15 行，并使用第一行数据作为导入数据集的列名。它忽略 header 行。

01/01/1933  NO RECORD   NO RECORD   MISSING     MISSING

skip 参数根本不影响我导入的内容。我如何提及需要用作列名的行号。或者我可以重命名列名，但不应忽略第一行数据。

诊断

Input contains no \n. Taking this to be a filename to open
File opened, filesize is 0.001319 GB.
Memory mapping ... ok
Detected eol as \r\n (CRLF) in that order, the Windows standard.
Positioned on line 1 after skip or autostart
This line is the autostart and not blank so searching up for the last non-blank ... line 1
Detecting sep ... '\t'
Detected 5 columns. Longest stretch was from line 15 to line 30
Starting data input on line 15 (either column names or first row of data). First 10 characters: 01/01/1933
The line before starting line 15 is non-empty and will be ignored (it has too few or too many items to be column names or data): DATE           HEIGHT    INPUT    OUTPUT  TESTMEASURE the fields on line 15 are character fields. Treating as the column names.

Answer 1

你有 12 行文本，2 行空格，然后是你的数据。但是我注意到 DATE 和 HEIGHT 之间有多余的空格。因此，制作一个这样的文本文件，其中您的数据是制表符分隔的，并在 DATE 和 HEIGHT 之间添加 2 tabs 而不是 1选项卡

garbage
garbage
garbage
garbage
garbage
garbage
garbage
garbage
garbage
garbage
garbage
garbage


DATE        HEIGHT  INPUT   OUTPUT  TESTMEASURE
01/01/1933  NO RECORD   NO RECORD   MISSING MISSING
01/02/1933  NO RECORD   NO RECORD   MISSING MISSING

做 fread(data) 给我：

fread(data)
   01/01/1933 NO RECORD NO RECORD MISSING MISSING
1: 01/02/1933 NO RECORD NO RECORD MISSING MISSING

删除 DATE 和 HEIGHT 之间的额外制表符会得到：

         DATE    HEIGHT     INPUT  OUTPUT TESTMEASURE
1: 01/01/1933 NO RECORD NO RECORD MISSING     MISSING
2: 01/02/1933 NO RECORD NO RECORD MISSING     MISSING

为什么 fread 不接受 skip 命令？

Why is fread not accepting the skip command?

r

fread

data.table

诊断