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选择数据浏览量。 根据特征说明制定的框架
原标题:Selecting rows in data.frame based on character strings
  • 时间:2012-04-09 00:27:52
  •  标签:
  • r

页: 1

test <-
c("Env_1990:trait_KPS", "Env_1990:trait_SPSM", "Env_1990:trait_TKW",
"Env_1990:trait_Yield", "Env_1991:trait_KPS", "Env_1991:trait_SPSM",
"Env_1991:trait_TKW", "Env_1991:trait_Yield", "Env_1992:trait_KPS",
"Env_1992:trait_SPSM", "Env_1992:trait_TKW", "Env_1992:trait_Yield",
"Env_1993:trait_KPS", "Env_1993:trait_SPSM", "Env_1993:trait_TKW",
"Env_1993:trait_Yield", "Env_1994:trait_KPS", "Env_1994:trait_SPSM",
"Env_1994:trait_TKW", "Env_1994:trait_Yield", "Env_1995:trait_KPS",
"Env_1995:trait_SPSM", "Env_1995:trait_TKW", "Env_1995:trait_Yield",
"Gen_B88:Env_1990:trait_KPS", "Gen_B88:Env_1990:trait_SPSM",
"Gen_B88:Env_1990:trait_TKW", "Gen_B88:Env_1990:trait_Yield",
"Gen_B88:Env_1991:trait_KPS", "Gen_B88:Env_1991:trait_SPSM",
"Gen_B88:Env_1991:trait_TKW", "Gen_B88:Env_1991:trait_Yield",
"Gen_B88:Env_1992:trait_KPS", "Gen_B88:Env_1992:trait_SPSM",
"Gen_B88:Env_1992:trait_TKW", "Gen_B88:Env_1992:trait_Yield",
"Gen_B88:Env_1993:trait_KPS", "Gen_B88:Env_1993:trait_SPSM",
"Gen_B88:Env_1993:trait_TKW", "Gen_B88:Env_1993:trait_Yield")

我只想选择从<代码>开始的行文。 Env_。 我在<代码>上尝试了这项守则。 R

grep(pattern="[Env_]", x=test).

该守则给我所有各行,因为<代码>。 Env_ 载于每一行名。 我想知道,如何选择只从<代码>开始的行文。 Env_。 事先感谢您的帮助。

最佳回答

您希望添加<条码><>> > > 字典> ,以 字面/显示:

> grep("^Env_", test)
 [1]  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
> grep("^Env_", test, value = TRUE)
 [1] "Env_1990:trait_KPS"   "Env_1990:trait_SPSM"  "Env_1990:trait_TKW"  
 [4] "Env_1990:trait_Yield" "Env_1991:trait_KPS"   "Env_1991:trait_SPSM" 
 [7] "Env_1991:trait_TKW"   "Env_1991:trait_Yield" "Env_1992:trait_KPS"  
[10] "Env_1992:trait_SPSM"  "Env_1992:trait_TKW"   "Env_1992:trait_Yield"
[13] "Env_1993:trait_KPS"   "Env_1993:trait_SPSM"  "Env_1993:trait_TKW"  
[16] "Env_1993:trait_Yield" "Env_1994:trait_KPS"   "Env_1994:trait_SPSM" 
[19] "Env_1994:trait_TKW"   "Env_1994:trait_Yield" "Env_1995:trait_KPS"  
[22] "Env_1995:trait_SPSM"  "Env_1995:trait_TKW"   "Env_1995:trait_Yield"
问题回答

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