R 如何将表转换为data.table

如果由于某种原因，R工作流中出现了一个基本的R（二维）

表

对象，那么在保持其维度结构的同时，将其转换为

数据表

的最佳（简洁、可读、高效）方法是什么

示例数据：

---

两种可能的解决方案是使用

unclass

（将表格转换为常规二维数组）或

as.data.frame

的矩阵方法：

# Convert it to a regular array with unclass
data.table(unclass(tab), keep.rownames = "Pr")
#    Pr T1 T2 T3
# 1: P1  0  1  0
# 2: P2  0  1  0
# 3: P3  1  1  1
# 4: P4  1  1  0
# 5: P9  0  0  1

# Convert it first to a data.frame 
setDT(as.data.frame.matrix(tab), keep.rownames = "Pr")[]
#    Pr T1 T2 T3
# 1: P1  0  1  0
# 2: P2  0  1  0
# 3: P3  1  1  1
# 4: P4  1  1  0
# 5: P9  0  0  1

---

两种可能的解决方案是使用

unclass

（将表格转换为常规二维数组）或

as.data.frame

的矩阵方法：

# Convert it to a regular array with unclass
data.table(unclass(tab), keep.rownames = "Pr")
#    Pr T1 T2 T3
# 1: P1  0  1  0
# 2: P2  0  1  0
# 3: P3  1  1  1
# 4: P4  1  1  0
# 5: P9  0  0  1

# Convert it first to a data.frame 
setDT(as.data.frame.matrix(tab), keep.rownames = "Pr")[]
#    Pr T1 T2 T3
# 1: P1  0  1  0
# 2: P2  0  1  0
# 3: P3  1  1  1
# 4: P4  1  1  0
# 5: P9  0  0  1

# Convert it to a regular array with unclass
data.table(unclass(tab), keep.rownames = "Pr")
#    Pr T1 T2 T3
# 1: P1  0  1  0
# 2: P2  0  1  0
# 3: P3  1  1  1
# 4: P4  1  1  0
# 5: P9  0  0  1

# Convert it first to a data.frame 
setDT(as.data.frame.matrix(tab), keep.rownames = "Pr")[]
#    Pr T1 T2 T3
# 1: P1  0  1  0
# 2: P2  0  1  0
# 3: P3  1  1  1
# 4: P4  1  1  0
# 5: P9  0  0  1