我在R中使用XGBoost时遇到了问题。我正在读取一个包含数据的CSV文件：

get_data = function(){#加载数据path = "dados_eye.csv"data = read.csv(path)#分为两组train_porcentage = 0.05train_lines = nrow(data)*train_porcentagetrain = data[1:train_lines,]test = data[train_lines:nrow(data),]rownames(train) = c(1:nrow(train))rownames(test) = c(1:nrow(test))return (list("test" = test, "train" = train))}

这个函数在main.R中被调用

lista_dados = get_data()#machine = train_svm(lista_dados$train)#machine = train_rf(lista_dados$train)machine = train_xgt(lista_dados$train)

问题出在train_xgt函数中

train_xgt = function(train_data){data_train = data.frame(train_data[,1:14])label_train = data.frame(factor(train_data[,15]))print(is.data.frame(data_train))print(is.data.frame(label_train))dtrain = xgb.DMatrix(data_train, label=label_train)machine = xgboost(dtrain, num_class = 4 ,max.depth = 2,     eta = 1, nround = 2,nthread = 2,     objective = "binary:logistic")return (machine)    }

这是错误信息：

@ubuntu:~/Documents/EEG_DATA/Dados_Eye$ Rscript main.R

[1] TRUE

[1] TRUE

Error in xgb.DMatrix(data_train, label = label_train) :
xgb.DMatrix: does not support to construct from list Calls: train_xgt -> xgb.DMatrix Execution halted @ubuntu:~/Documents/EEG_DATA/Dados_Eye$

如您所见，它们都是数据框。

我不知道自己做错了什么，请帮助我！

回答：

只需先使用as.matrix()将数据框转换为矩阵，然后再传递给xgb.Dmatrix()即可。