Question

我正在寻找削减数据的R代码。我的初始数据如下所示：

这是前300行：

c(0.096, 0.088, 0.082, 0.078, 0.06, 0.057, 0.048, 0.047, 0.044, 
0.044, 0.039, 0.038, 0.037, 0.037, 0.035, 0.035, 0.034, 0.034, 
0.033, 0.033, 0.032, 0.032, 0.031, 0.031, 0.031, 0.031, 0.03, 
0.03, 0.03, 0.03, 0.03, 0.029, 0.029, 0.029, 0.029, 0.2, 1100, 
1100, 27, 15, 3.2, 2.2, 1, 0.65, 0.37, 0.3, 0.19, 0.16, 0.12, 
0.12, 0.099, 0.096, 0.085, 0.082, 0.064, 0.06, 0.051, 0.05, 0.046, 
0.045, 0.041, 0.041, 0.039, 0.038, 0.037, 0.036, 0.035, 0.035, 
0.034, 0.033, 0.032, 0.032, 0.032, 0.031, 0.031, 0.031, 0.03, 
0.03, 0.03, 0.03, 0.029, 0.029, 0.029, 0.029, 0.029, 0.028, 0.028, 
0.028, 4.4, 1100, 1100, 120, 21, 9.4, 3.1, 1.6, 0.85, 0.51, 0.33, 
0.23, 0.18, 0.18, 0.13, 0.11, 0.1, 0.092, 0.085, 0.077, 0.065, 
0.058, 0.053, 0.05, 0.047, 0.045, 0.043, 0.042, 0.039, 0.038, 
0.037, 0.036, 0.035, 0.035, 0.034, 0.033, 0.033, 0.032, 0.031, 
0.031, 0.031, 0.03, 0.03, 0.03, 0.029, 0.029, 0.029, 0.029, 0.028, 
0.028, 0.028, 0.028, 0.028, 37, 1100, 98, 17, 6.2, 2.7, 1.3, 
1, 0.47, 0.31, 0.23, 0.16, 0.14, 0.11, 0.1, 0.093, 0.087, 0.079, 
0.066, 0.057, 0.053, 0.049, 0.046, 0.044, 0.041, 0.04, 0.037, 
0.036, 0.035, 0.035, 0.033, 0.033, 0.032, 0.032, 0.031, 0.031, 
0.03, 0.03, 0.029, 0.029, 0.029, 0.029, 0.028, 0.028, 0.028, 
0.027, 0.027, 0.027, 0.026, 0.026, 0.026, 2.6, 1100, 1100, 190, 
22, 7.8, 3.2, 2.2, 0.91, 0.51, 0.37, 0.23, 0.18, 0.14, 0.12, 
0.11, 0.098, 0.09, 0.085, 0.071, 0.061, 0.055, 0.051, 0.049, 
0.045, 0.043, 0.04, 0.039, 0.037, 0.036, 0.035, 0.034, 0.033, 
0.032, 0.032, 0.031, 0.031, 0.03, 0.03, 0.03, 0.029, 0.029, 0.028, 
0.028, 0.028, 0.027, 0.027, 0.027, 0.026, 0.026, 0.026, 0.026, 
0.026, 8.8, 1100, 160, 21, 7.5, 3.4, 1.6, 0.89, 0.52, 0.33, 0.23, 
0.17, 0.14, 0.13, 0.1, 0.094, 0.087, 0.078, 0.065, 0.056, 0.051, 
0.049, 0.045, 0.043, 0.039, 0.039, 0.036, 0.035, 0.034, 0.033, 
0.032, 0.032, 0.031, 0.03, 0.03, 0.03, 0.029, 0.029, 0.028, 0.028, 
0.027, 0.027, 0.026, 0.026, 0.026, 0.026, 0.025, 0.025, 0.025, 
0.025, 0.025, 0.025, 13, 1100, 170)

这是数据结构：

> dput(head(.data))
structure(list(y = c(0.096, 0.088, 0.082, 0.078, 0.06, 0.057), 
    x = 1:6), row.names = c(NA, -6L), class = c("tbl_df", "tbl", 
"data.frame"))

如果我放大它：

我想得到的结果是这样的（此图形仅代表前300行。我没有使用任何算法）：

我试图使用这种算法来削减数据：

find_cycle <- function(x, y) {
  dy <- diff(c(0, y))
  cut(
    x = x,
    breaks = c(min(x), which(dy > mean(dy) + 3 * sd(dy)), max(x)),
    include.lowest = TRUE,
    right = FALSE
  )
}
.data <- .data %>%
  mutate(cycle = find_cycle(x, y)) %>%
  group_by(cycle) %>%
  mutate(x_cycle = 1:n()) %>%
  ungroup()

p <- ggplot(data = .data, mapping = aes(x = x_cycle, y = y, colour = cycle)) +
  geom_point() +
  geom_line() +
  theme(legend.position='none')

p

但是结果不是我所期望的：

你有什么主意吗？谢谢。抱歉，我的英文单词不够完美。

Answer 1

仅当您具有以前的x轴时，您的功能才有效。只有这样才能知道如何根据数据结构构建它。但似乎一切正常。

d <- tibble(y = c(0.096, 0.088, 0.082, 0.078, 0.06, 0.057, 0.048, 0.047, 0.044, 
  0.044, 0.039, 0.038, 0.037, 0.037, 0.035, 0.035, 0.034, 0.034, 
  0.033, 0.033, 0.032, 0.032, 0.031, 0.031, 0.031, 0.031, 0.03, 
  0.03, 0.03, 0.03, 0.03, 0.029, 0.029, 0.029, 0.029, 0.2, 1100, 
  1100, 27, 15, 3.2, 2.2, 1, 0.65, 0.37, 0.3, 0.19, 0.16, 0.12, 
  0.12, 0.099, 0.096, 0.085, 0.082, 0.064, 0.06, 0.051, 0.05, 0.046, 
  0.045, 0.041, 0.041, 0.039, 0.038, 0.037, 0.036, 0.035, 0.035, 
  0.034, 0.033, 0.032, 0.032, 0.032, 0.031, 0.031, 0.031, 0.03, 
  0.03, 0.03, 0.03, 0.029, 0.029, 0.029, 0.029, 0.029, 0.028, 0.028, 
  0.028, 4.4, 1100, 1100, 120, 21, 9.4, 3.1, 1.6, 0.85, 0.51, 0.33, 
  0.23, 0.18, 0.18, 0.13, 0.11, 0.1, 0.092, 0.085, 0.077, 0.065, 
  0.058, 0.053, 0.05, 0.047, 0.045, 0.043, 0.042, 0.039, 0.038, 
  0.037, 0.036, 0.035, 0.035, 0.034, 0.033, 0.033, 0.032, 0.031, 
  0.031, 0.031, 0.03, 0.03, 0.03, 0.029, 0.029, 0.029, 0.029, 0.028, 
  0.028, 0.028, 0.028, 0.028, 37, 1100, 98, 17, 6.2, 2.7, 1.3, 
  1, 0.47, 0.31, 0.23, 0.16, 0.14, 0.11, 0.1, 0.093, 0.087, 0.079, 
  0.066, 0.057, 0.053, 0.049, 0.046, 0.044, 0.041, 0.04, 0.037, 
  0.036, 0.035, 0.035, 0.033, 0.033, 0.032, 0.032, 0.031, 0.031, 
  0.03, 0.03, 0.029, 0.029, 0.029, 0.029, 0.028, 0.028, 0.028, 
  0.027, 0.027, 0.027, 0.026, 0.026, 0.026, 2.6, 1100, 1100, 190, 
  22, 7.8, 3.2, 2.2, 0.91, 0.51, 0.37, 0.23, 0.18, 0.14, 0.12, 
  0.11, 0.098, 0.09, 0.085, 0.071, 0.061, 0.055, 0.051, 0.049, 
  0.045, 0.043, 0.04, 0.039, 0.037, 0.036, 0.035, 0.034, 0.033, 
  0.032, 0.032, 0.031, 0.031, 0.03, 0.03, 0.03, 0.029, 0.029, 0.028, 
  0.028, 0.028, 0.027, 0.027, 0.027, 0.026, 0.026, 0.026, 0.026, 
  0.026, 8.8, 1100, 160, 21, 7.5, 3.4, 1.6, 0.89, 0.52, 0.33, 0.23, 
  0.17, 0.14, 0.13, 0.1, 0.094, 0.087, 0.078, 0.065, 0.056, 0.051, 
  0.049, 0.045, 0.043, 0.039, 0.039, 0.036, 0.035, 0.034, 0.033, 
  0.032, 0.032, 0.031, 0.03, 0.03, 0.03, 0.029, 0.029, 0.028, 0.028, 
  0.027, 0.027, 0.026, 0.026, 0.026, 0.026, 0.025, 0.025, 0.025, 
  0.025, 0.025, 0.025, 13, 1100, 170))

d <-  d %>% mutate( x = row_number() )

find_cycle <- function(x, y) {
  dy <- diff(c(0, y))
  cut(
    x = x,
    breaks = c(min(x), which(dy > mean(dy) + 3 * sd(dy)), max(x)),
    include.lowest = TRUE,
    right = FALSE
  )
}
d %>%
  mutate(cycle = as.character(find_cycle(x, y))) %>%
  group_by(cycle) %>%
  mutate(x_cycle = 1:n()) %>%
  ungroup() %>% 
  ggplot(aes(x = x_cycle, y = y, colour = cycle)) +
  geom_point() +
  geom_line()

切割数据（季节成分）

1 个答案: