R 将共现数据帧转换为平方矩阵
假设我有这个数据帧:R 将共现数据帧转换为平方矩阵,r,R,假设我有这个数据帧: d <- structure(list(A = c(1L, 1L, 1L, 0L, 1L, 1L, 1L), B = c(1L, 1L, 1L, 1L, 1L, 1L, 1L), C = c(0L, 0L, 1L, 0L, 0L, 0L, 0L), D = c(0L, 0L, 0L, 0L, 0L, 0L, 0L), E = c(0L, 0L, 0L, 0L, 0L, 0L, 0L), F = c(0L, 0L, 0L, 0L, 0L, 0L, 0L),
d <- structure(list(A = c(1L, 1L, 1L, 0L, 1L, 1L, 1L), B = c(1L, 1L,
1L, 1L, 1L, 1L, 1L), C = c(0L, 0L, 1L, 0L, 0L, 0L, 0L), D = c(0L,
0L, 0L, 0L, 0L, 0L, 0L), E = c(0L, 0L, 0L, 0L, 0L, 0L, 0L), F = c(0L,
0L, 0L, 0L, 0L, 0L, 0L), G = c(0L, 0L, 0L, 0L, 0L, 0L, 0L), H = c(0L,
1L, 0L, 0L, 1L, 1L, 0L)), row.names = c(NA, -7L), class = c("tbl_df",
"tbl", "data.frame"))
A B C D E F G H
<int> <int> <int> <int> <int> <int> <int> <int>
1 1 1 0 0 0 0 0 0
2 1 1 0 0 0 0 0 1
3 1 1 1 0 0 0 0 0
4 0 1 0 0 0 0 0 0
5 1 1 0 0 0 0 0 1
6 1 1 0 0 0 0 0 1
7 1 1 0 0 0 0 0 0
但是当做非常大的矩阵时,这是很慢的。有没有更快的方法?您用文字描述的内容听起来像是普通的矩阵乘法,通过将diag设置为0是不允许的:
temp <- t(as.matrix(d)) %*% as.matrix(d)
diag(temp) <- 0
> temp
A B C D E F G H
A 0 6 1 0 0 0 0 3
B 6 0 1 0 0 0 0 3
C 0 1 0 0 0 0 0 0
D 0 0 0 0 0 0 0 0
E 0 0 0 0 0 0 0 0
F 0 0 0 0 0 0 0 0
G 0 0 0 0 0 0 0 0
H 3 3 0 0 0 0 0 0
tempm您是指crossprod
功能吗?
A B C D E F G H
A 0 6 1 0 0 0 0 3
B 6 0 1 0 0 0 0 3
C 1 1 0 0 0 0 0 0
D 0 0 0 0 0 0 0 0
E 0 0 0 0 0 0 0 0
F 0 0 0 0 0 0 0 0
G 0 0 0 0 0 0 0 0
H 3 3 0 0 0 0 0 0
temp <- t(as.matrix(d)) %*% as.matrix(d)
diag(temp) <- 0
> temp
A B C D E F G H
A 0 6 1 0 0 0 0 3
B 6 0 1 0 0 0 0 3
C 0 1 0 0 0 0 0 0
D 0 0 0 0 0 0 0 0
E 0 0 0 0 0 0 0 0
F 0 0 0 0 0 0 0 0
G 0 0 0 0 0 0 0 0
H 3 3 0 0 0 0 0 0