read.table()-1

 所以打开读取GSE42872_series_matrix.txt.gz文件时，参数comment.char = "!"就表示!后面的注释文件不用读取。

> exprSet <- read.table("GSE42872_series_matrix.txt.gz",sep = "	",fill = T,comment.char = "!",header = T)
> class(exprSet)
[1] "data.frame"
> dim(exprSet)
[1] 33297     7
> head(exprSet)
   ID_REF GSM1052615 GSM1052616 GSM1052617 GSM1052618 GSM1052619
1 7892501    7.24559    6.80686    7.73301    6.18961    7.05335
2 7892502    6.82711    6.70157    7.02471    6.20493    6.76554
3 7892503    4.39977    4.50781    4.88250    4.36295    4.18137
4 7892504    9.48025    9.67952    9.63074    9.69200    9.91324
5 7892505    4.54734    4.45247    5.11753    4.87307    5.15505
6 7892506    6.80701    6.90597    6.72472    6.77028    6.77058
  GSM1052620
1    7.20371
2    6.24252
3    4.73492
4    9.65897
5    3.99340
6    6.77685

用notepad打开这个文件发现，有很多以!开头的注释行，难怪！

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为啥用双反斜杠，前一个斜杠表示转义