[英]Use apply to create a list of adjacency matrices from dataframe in R
我在 3 波中與 5 所不同的學校建立了友誼的邊緣列表。 我想為每所學校創建一個列表,其中包含 3 個鄰接矩陣(每個波一個)。 我可以一個一個地做到這一點,但我想使用循環或應用 function 來自動化它。
這是我用於一所學校和波的代碼:
school1_w1 <- filter(edges, school == 1 & wave == 1) %>%
graph_from_data_frame(., directed = TRUE) %>%
as_adjacency_matrix() %>% as.matrix()
school1_w2 <- filter(edges, school == 1 & wave == 2) %>%
graph_from_data_frame(., directed = TRUE) %>%
as_adjacency_matrix() %>% as.matrix()
school1_w3 <- filter(edges, school == 1 & wave == 3) %>%
graph_from_data_frame(., directed = TRUE) %>%
as_adjacency_matrix() %>% as.matrix()
school1 <- list(school1_w1, school1_w2, school1_w3)
我如何通過申請或循環為所有 5 所學校做到這一點? 下面的示例數據:
ego alter wave school
1 4 1 1
1 4 2 1
1 3 3 1
2 3 1 1
2 4 2 1
2 4 3 1
3 1 1 1
3 2 2 1
3 3 3 1
4 1 1 1
4 1 2 1
4 1 3 1
5 8 1 2
5 6 2 2
5 7 3 2
6 7 1 2
6 7 2 2
6 7 3 2
7 8 1 2
7 6 2 2
7 6 3 2
8 7 1 2
8 7 2 2
8 7 3 2
9 10 1 3
9 11 2 3
9 12 3 3
10 11 1 3
10 11 2 3
10 9 3 3
11 12 1 3
11 10 2 3
11 12 3 3
12 9 1 3
12 10 2 3
12 10 3 3
13 14 1 4
13 15 2 4
13 16 3 4
14 16 1 4
14 16 2 4
14 13 3 4
15 16 1 4
15 16 2 4
15 16 3 4
16 15 1 4
16 15 2 4
16 15 3 4
17 20 1 5
17 18 2 5
17 18 3 5
18 19 1 5
18 20 2 5
18 19 3 5
19 17 1 5
19 17 2 5
19 17 3 5
20 18 1 5
20 17 2 5
20 17 3 5
我們可以使用split
+ lapply
:
library(igraph)
result <- lapply(split(edges, list(edges$school, edges$wave)), function(x) {
graph_from_data_frame(x, directed = TRUE) %>%
as_adjacency_matrix() %>% as.matrix()
})
或by
:
result <- by(edges, list(edges$school, edges$wave), function(x) {
graph_from_data_frame(x, directed = TRUE) %>%
as_adjacency_matrix() %>% as.matrix()
})
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