按列名从矩阵中提取多列
按列名从矩阵中提取多列
提问于 2019-07-11 02:12:33
我有一个matrix格式的df，里面的所有值都是numeric (或NA)。
df的示例如下所示：
> dput(df)
structure(c(0, 1, 2, 3, 1, 2, 3, 4, 19.92053183, 19.94818362,
19.97583542, 20.00348721, -0.846185488, -0.870922179, -0.895658869,
-0.92039556, 56, 56, 56, 56, NA, 0.529513867, 0.477141211, 0.441261572,
NA, NA, 32, 32), .Dim = c(4L, 7L), .Dimnames = list(c("A", "B",
"C", "D"), c("A", "B", "C", "D", "E", "F", "G")))我想通过按名称选择所有行和特定列，从我的df创建一个新的矩阵df_new。
我试过了：
df_new = df[,c("A":"C","E","F":"G")]df_new = select(df,"A":"C","E","F":"G")df_new = select(df,c("A":"C","E","F":"G"))
对于我得到的第一个代码：
Error in "A":"C" : NA/NaN argument
In addition: Warning messages:
1: NAs introduced by coercion
2: NAs introduced by coercion对于我得到的第二和第三个代码：
Error in UseMethod("select_") :
no applicable method for 'select_' applied to an object of class "c('matrix', 'double', 'numeric')"结果应该如下所示：
>df_new = df[,c("A":"C","E","F":"G")]
>df_new
A B C E F G
A 1 NA 5 9 11 13
B 2 4 6 10 12 NA
C NA 5 NA NA 14
D 15 5 16 18 19我想我的错误类似于一个小的打字错误，但我没有找到它。提前感谢！
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/56976422
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