行号和内容不匹配

Question

我有dataframe "InorganicNoStdConditionResiduals"并拥有以下代码：

  View(InorganicNoStdConditionResiduals[,"Job..R"]) #gives a column with 46 rows and two different character --> [1] "14047/1" "18331/3" (correct)

  print(head(levels(InorganicNoStdConditionResiduals[,"Job..R"]))) 
  [1] "14047/1"  "14047/11" "14047/2"  "18331/2"  "18331/3"  "18331/4"
  # the answer should be: [1] "14047/1" "18331/3"
  test = levels(InorganicNoStdConditionResiduals[,"Job..R"]) #The environment view panel in RStudio tells me that there are 4794 character (4794 rows, but there are only 46 rows as verified withe View() command earlier)
  test1 = nrow(InorganicNoStdConditionResiduals)
  print(test1)
  [1] 46 # this is correct

可能是workspace中有些东西存在干扰吗？