我有以下邻接矩阵。我想将其转换为 R 中的两列表。可重现的示例包括：
Village_A Village_B Village_C Village_D Village_E
Village_A 438 507 157 166 832
Village_B 285 887 116 758 244
Village_C 935 459 217 561 550
Village_D 151 606 202 869 169
Village_E 572 362 416 899 510
我想将它转换为一个两列表：
Village_A Village_A 438
Village_B Village_A 285
Village_C Village_A 935
Village_D Village_A 151
Village_E Village_A 572
Village_A Village_B 507
Village_B Village_B 887
Village_C Village_B 459
Village_D Village_B 606
Village_E Village_B 362
Village_A Village_C 157
Village_B Village_C 116
Village_C Village_C 217
Village_D Village_C 202
Village_E Village_C 416
Village_A Village_D 166
Village_B Village_D 758
Village_C Village_D 561
Village_D Village_D 869
Village_E Village_D 899
Village_A Village_E 832
Village_B Village_E 244
Village_C Village_E 550
Village_D Village_E 169
Village_E Village_E 510
#temptable.txt:
##Village_A Village_B Village_C Village_D Village_E
##Village_A 438 507 157 166 832
##Village_B 285 887 116 758 244
##Village_C 935 459 217 561 550
##Village_D 151 606 202 869 169
##Village_E 572 362 416 899 510
data <- read.delim("temptable.txt",sep="")
crossdata <- lapply(rownames(data),function(x)sapply(colnames(data),function(y)list(x,y,data[x,y])))
crossdatatmp <- matrix(unlist(crossdata),nrow=3)
crossdatamat <- t(crossdatatmp)
colnames(crossdatamat) <- c("From","To","Value")
crossdatadf <- as.data.frame(crossdatamat,stringsAsFactors=F)
crossdatadf[,3] <- as.numeric(crossdatadf[,3])
crossdatadf
## From To Value
##1 Village_A Village_A 438
##2 Village_A Village_B 507
##3 Village_A Village_C 157
##4 Village_A Village_D 166
##5 Village_A Village_E 832
## ...
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