如何在R中修复“无法将类“ dummyVars”强制转换为data.frame”

Question

我正在查看Titanic dataset，并且想在Sex变量上运行One-Hot Encoding。但是我得到一个错误，即无法将dummyVars类转换为数据帧。

错误是：cannot coerce class ‘"dummyVars"’ to a data.frame。

我遵循了此演练：url

# Setup
# install.packages('caret')
library(caret)

# Sample Data
head(cln_dados_treino)

  Survived Pclass    Sex Age SibSp Parch    Fare
         0      3   male  22     1     0  7.2500
         1      1 female  38     1     0 71.2833
         1      3 female  26     0     0  7.9250
         1      1 female  35     1     0 53.1000
         0      3   male  35     0     0  8.0500
         0      3   male  24     0     0  8.4583

# One-Hot Encoding to Variable Sex
dv_cln_dados_treino <- dummyVars(' ~ Sex', data = cln_dados_treino)
dv_cln_dados_treino <- data.frame(predict(teste, newdata = dv_cln_dados_treino))

然后出现错误：

Error in as.data.frame.default(newdata) : 
  cannot coerce class ‘"dummyVars"’ to a data.frame

  Survived Pclass Sex.male Sex.female Age SibSp Parch    Fare
         0      3        1          0  22     1     0  7.2500
         1      1        0          1  38     1     0 71.2833
         1      3        0          1  26     0     0  7.9250
         1      1        0          1  35     1     0 53.1000
         0      3        1          0  35     0     0  8.0500
         0      3        1          0  24     0     0  8.4583