從另一種數據類型命名R中的列和行名稱

Question

我有一個像這樣的數組：

> columnnames
[1] trade    grain    crude    corn     ship     wheat    acq      interest money.fx earn
> summary(columnnames)
 acq     corn    crude     earn    grain interest money.fx     ship    trade    wheat 
   1        1        1        1        1        1        1        1        1        1 
> str(columnnames)
Factor w/ 10 levels "acq","corn","crude",..: 9 5 3 2 8 10 1 6 7 4

並有另一個這樣的：

> rownames
 [1] "tp" "fn" "fp" "tn" "tpr" "fnr"  "precision" "recall"  "acc"  "Fmeasure"

問題很簡單：如何使用這些行名和列名創建一個空矩陣或表（沒關系）？

Answer 1

你可以做類似的事情

your.matrix <- matrix(NA, nrow = length(rownames), ncol = length(columnnames))
rownames(your.matrix) <- rownames
colnames(your.matrix) <- as.character(columnnames)

要么

your.matrix <- matrix(NA, nrow = length(rownames), ncol = length(columnnames), dimnames = list(rownames, columnnames))