R: read.arff错误

Question

我开始在R和Weka一起工作，我被困在了第一步。我将我的csv文件转换为arff文件，并使用在线转换器进行了转换，但是当我试图将它读取到R中时，我得到了以下错误消息。

  require(RWeka)
  A <- read.arff("Environmental variables all overviewxlsx.arff")
Error in .jnew("weka/core/Instances", .jcast(reader, "java/io/Reader")) : 
 java.io.IOException: no valid attribute type or invalid enumeration, read Token[[°C]],    line 6 

有谁能帮到我吗？

谢谢!

附注：正确的软件包(RWeka)已经安装好了。

Answer 1

因为read.arff()返回数据，所以可以跳过转换过程并使用read.csv()。

    train_arff<-read.arff(file.choose())
    str(train_arff)

    'data.frame':   14 obs. of  5 variables:
    $ outlook    : Factor w/ 3 levels "sunny","overcast",..: 1 1 2 3 3 3 2 1 1 3 ...
    $ temperature: Factor w/ 3 levels "hot","mild","cool": 1 1 1 2 3 3 3 2 3 2 ...
    $ humidity   : Factor w/ 2 levels "high","normal": 1 1 1 1 2 2 2 1 2 2 ...
    $ windy      : logi  FALSE TRUE FALSE FALSE FALSE TRUE ...
    $ play       : Factor w/ 2 levels "yes","no": 2 2 1 1 1 2 1 2 1 1 ...

    train_csv<-read.csv(file.choose())
    str(train_csv)

    'data.frame':   14 obs. of  5 variables:
    $ outlook    : Factor w/ 3 levels "overcast","rainy",..: 3 3 1 2 2 2 1 3 3 2 ...
    $ temperature: Factor w/ 3 levels "cool","hot","mild": 2 2 2 3 1 1 1 3 1 3 ...
    $ humidity   : Factor w/ 2 levels "high","normal": 1 1 1 1 2 2 2 1 2 2 ...
    $ windy      : logi  FALSE TRUE FALSE FALSE FALSE TRUE ...
    $ play       : Factor w/ 2 levels "no","yes": 1 1 2 2 2 1 2 1 2 2 ...

否则，您的.arff文件应该有这个格式化