我需要帮助。我有两个列表:第一个包含不同点的ndvi时间序列,第二个包含相同图的降水时间序列(图在两个列表中的顺序相同)。
我需要合并这两个列表。我想将一个列表中的降水列添加到另一个列表中对应的ndvi列中,这是关于日期的(在这里用行名中的字母表示),以便对列之间的相关性进行后检验分析。而ndvi和降水时间序列都具有不同的长度和不同的日期。
我创建了两个列表作为我的数据集的示例。但是,在我的实际数据集中,行名是每月的日期,格式为&;%Y-%m-%d&;
library(tidyverse)
set.seed(100)
# First variable is ndvi.mon1 (monthly ndvi)
ndvi.mon1 <- vector("list", length = 3)
for (i in seq_along(ndvi.mon1)) {
aux <- data.frame(ndvi = sample(randu$x,
sample(c(seq(1,20, 1)),1),
replace = T))
ndvi.mon1[i] <- aux
ndvi.mon1 <- ndvi.mon1 %>% map(data.frame)
rownames(ndvi.mon1[[i]]) <- sample(letters, size=seq(letters[1:as.numeric(aux %>% map(length))]) %>% length)
}
# Second variable is precipitation
precipitation <- vector("list", length = 3)
for (i in seq_along(ndvi.mon1)){
prec_aux <- data.frame(precipitation = sample(randu$x*500,
26,
replace = T))
row.names(prec_aux) <- seq(letters[1:as.numeric(prec_aux %>% map(length))])
precipitation[i] <- prec_aux
precipitation <- precipitation %>% map(data.frame)
rownames(precipitation[[i]]) <- letters[1:(as.numeric(precipitation[i] %>% map(dim) %>% map(first)))]
}
有人能帮帮我吗?
谢谢! !
Marcio .
也许像这样?
library(dplyr)
library(purrr)
precipitation2 <- precipitation %>%
map(rownames_to_column) %>%
map(rename, precipitation = 2)
ndvi.mon2 <- ndvi.mon1 %>%
map(rownames_to_column) %>%
map(rename, ndvi = 2)
purrr::map2(ndvi.mon2, precipitation2, left_join, by = "rowname")
[[1]]
rowname ndvi precipitation
1 k 0.354886 209.7415
2 x 0.596309 103.3700
3 r 0.978769 403.8775
4 l 0.322291 354.2630
5 c 0.831722 348.9390
6 s 0.973205 273.6030
7 h 0.949827 218.6430
8 y 0.443353 61.9310
9 b 0.826368 8.3290
10 d 0.337308 291.2110
下面将返回已合并的data.frames列表,使用rownames:
lapply(seq_along(ndvi.mon1), function(i) {
merge(
x = data.frame(date = rownames(ndvi.mon1[[i]]), ndvi = ndvi.mon1[[i]][,1]),
y = data.frame(date = rownames(precipitation[[i]]), precip = precipitation[[i]][,1]),
by="date"
)
})
输出:
[[1]]
date ndvi precip
1 b 0.826368 8.3290
2 c 0.831722 348.9390
3 d 0.337308 291.2110
4 h 0.949827 218.6430
5 k 0.354886 209.7415
6 l 0.322291 354.2630
7 r 0.978769 403.8775
8 s 0.973205 273.6030
9 x 0.596309 103.3700
10 y 0.443353 61.9310
[[2]]
date ndvi precip
1 g 0.415824 283.9335
2 k 0.573737 311.8785
3 p 0.582422 354.2630
4 y 0.952495 495.4340
[[3]]
date ndvi precip
1 b 0.656463 332.5700
2 c 0.347482 94.7870
3 d 0.215425 431.3770
4 e 0.063100 499.2245
5 f 0.419460 304.5190
6 g 0.712057 226.7125
7 h 0.666700 284.9645
8 i 0.778547 182.0295
9 k 0.902520 82.5515
10 l 0.593219 430.6630
11 m 0.788715 443.5345
12 n 0.347482 132.3950
13 q 0.719538 79.1835
14 r 0.911370 100.7025
15 s 0.258743 309.3575
16 t 0.940644 142.3725
17 u 0.626980 335.4360
18 v 0.167640 390.4915
19 w 0.826368 63.3760
20 x 0.937211 439.8685