矩阵中的区间数

Question

我有一个包含 3523 个观察值和 92 个变量的数据框。

下面是一个数据帧为 6 的例子；观察的 24 小时记录从 4:00am 开始，到 4:00am 结束。

  04:00   04:15   04:30 05:00  ...  04:35
1  -       -     -       -     ...  -
2  2       2     2       -     ...  -
3  2       -     -       2     ...  -
4  -       -     2       -     ...  -
5  -       -     -       -     ...  -
6  -       -     -       -     ...  2

每行包含值“-”和“2”。

我想提取以“2”开头的区间的开始和结束

For example 2: 04:15-04:30; 
            3: 04:00 ; 05:00
            4: 04:30

谢谢

Answer 1

让我们扩展一下您的示例。在扩展的示例中，我们可以注意到第 1 行没有 2，并且还有一些更棘手的问题，例如第 6 行我们有 2，然后是一个中断（ -)，之后是两个 2、一个 - 和一个 2 的序列。

    04:00 04:15 04:30 05:00 05:15 05:30
 1:     -     -     -     -     -     -
 2:     2     2     2     -     2     2
 3:     2     -     -     2     2     2
 4:     -     -     2     -     2     2
 5:     -     -     -     -     2     2
 6:     2     -     2     2     -     2
 7:     -     -     -     -     2     2
 8:     2     2     -     2     2     2
 9:     -     -     -     -     2     2
10:     2     2     -     2     2     2

如果您输入：

，您可以重现它

WorkSchedulesDay1 <- structure(list(`04:00` = c("-", "2", "2", "-", "-", "2", "-", 
"2", "-", "2"), `04:15` = c("-", "2", "-", "-", "-", "-", "-", 
"2", "-", "2"), `04:30` = c("-", "2", "-", "2", "-", "2", "-", 
"-", "-", "-"), `05:00` = c("-", "-", "2", "-", "-", "2", "-", 
"2", "-", "2"), `05:15` = c("-", "2", "2", "2", "2", "-", "2", 
"2", "2", "2"), `05:30` = c("-", "2", "2", "2", "2", "2", "2", 
"2", "2", "2")), row.names = c(NA, -10L), class = c("data.table", 
"data.frame"))

之后您应用代码：

WorkSchedulesDay1 <- WorkSchedulesDay1 %>% 
  group_by(rn = row_number()) %>% 
  gather(time, val, 1:6) %>%
  arrange(time) %>%
  mutate(tmp = cumsum(coalesce(val != lag(val), FALSE))) %>% arrange(rn) %>%
  filter(!val == "-") %>%
  group_by(rn, tmp) %>%
  mutate(
    time = case_when(
      n() > 1 ~ paste(min(time), max(time), sep = " - "),
      TRUE ~ time
    )
  ) %>%
  ungroup() %>% distinct(rn, tmp, time) %>%
  group_by(rn) %>%
  mutate(
    intervals = case_when(
      n() > 1 ~ paste(time, collapse = ", "),
      TRUE ~ time
    )
  ) %>% distinct(rn, intervals) %>%
  write_csv("WorkSchedulesDay1.csv")

你会看到你得到的是：

     rn intervals                   
  <int> <chr>                       
     2 04:00 - 04:30, 05:15 - 05:30
     3 04:00, 05:00 - 05:30        
     4 04:30, 05:15 - 05:30        
     5 05:15 - 05:30               
     6 04:00, 04:30 - 05:00, 05:30 
     7 05:15 - 05:30               
     8 04:00 - 04:15, 05:00 - 05:30
     9 05:15 - 05:30               
    10 04:00 - 04:15, 05:00 - 05:30

第 1 行没有记录，因为那里只有 -。

同样，第2行没有05:00的记录，只是因为那里有一个-。

以类似的方式，第 6 行有 04:00, 04:30 - 05:00, 05:30，因为 04:15 和 05:15 有 -。

矩阵中的区间数

Interval numbers in matrix

time

r

extract

tail

matrix