Question

我需要从变量中提取数值，该变量是一个结合了数值和名称的结构

structure(c(-1.14332132657709, -1.1433213265771, -1.20580568266868, 
-1.75735158849487, -1.35614113300058), .Names = c("carbon", 
"nanotubes", "potential", "neuron", "cell", "adhesion"))

最后，我想要一个只有这个信息的载体

c(-1.14332132657709, -1.1433213265771, -1.20580568266868, 
-1.75735158849487, -1.35614113300058)

我该怎么办？非常感谢

Answer 1

as.numeric()和unname()都这样做：

R> structure(c(-1.14332132657709, -1.1433213265771, -1.20580568266868,
+              -1.75735158849487, -1.35614113300058, NA),
+            .Names = c("carbon", "nanotubes", "potential", 
+            "neuron", "cell", "adhesion"))
   carbon nanotubes potential    neuron      cell  adhesion 
 -1.14332  -1.14332  -1.20581  -1.75735  -1.35614        NA 
R> foo
   carbon nanotubes potential    neuron      cell  adhesion 
 -1.14332  -1.14332  -1.20581  -1.75735  -1.35614        NA 
R>
R> as.numeric(foo)            ## still my 'default' approach
[1] -1.14332 -1.14332 -1.20581 -1.75735 -1.35614       NA
R>
R> unname(foo)                ## maybe preferable though
[1] -1.14332 -1.14332 -1.20581 -1.75735 -1.35614       NA
R>

Answer 2

myVec <- structure(c(-1.14332132657709, -1.1433213265771, -1.20580568266868, 
  -1.75735158849487, -1.35614113300058), .Names = c("carbon", 
  "nanotubes", "potential", "neuron", "cell"))

as.numeric(myVec)
# [1] -1.143321 -1.143321 -1.205806 -1.757352 -1.356141

或者

names(myVec) <- NULL

修改

原型向量的
unname只是names(obj) <- NULL，带有一些多余的代码。

Answer 3

unname怎么样？

> myVec <- structure(c(-1.14332132657709, -1.1433213265771, -1.20580568266868, 
  -1.75735158849487, -1.35614113300058), .Names = c("carbon", 
  "nanotubes", "potential", "neuron", "cell"))

+ + > > unname(myVec)
[1] -1.143321 -1.143321 -1.205806 -1.757352 -1.356141

如何从R中的结构对象中提取数值

3 个答案: