Question

亲爱的，

我是R编程的新手，因此，我来这里是为了寻求帮助。我试图找到解决这个问题的方法。我一直努力但没有成功。

我有一个类似的数据框...

df2 <- data.frame(Recordig = c("Rec1", "Rec1", "Rec1", "Rec1", "Rec1", "Rec1", 
                               "Rec2","Rec2","Rec2","Rec2","Rec2","Rec2"), 
                  MediaName = c("Imagem1","Imagem1","Imagem1",
                                "Estimulo1","Estimulo1","Estimulo1",
                                "Imagem1","Imagem1","Imagem1",
                                "Estimulo1","Estimulo1","Estimulo1"),
                  Timestamp = c( 4975 , 5155 , 5312 ,25076, 25463 ,26040 , 5035 , 5248, 5551, 17047 , 17263,  17533))

以下简化版

 Recordig MediaName Timestamp
1      Rec1   Imagem1      4975
2      Rec1   Imagem1      5155
3      Rec1   Imagem1      5312
4      Rec1 Estimulo1     25076
5      Rec1 Estimulo1     25463
6      Rec1 Estimulo1     26040
7      Rec2   Imagem1      5035
8      Rec2   Imagem1      5248
9      Rec2   Imagem1      5551
10     Rec2 Estimulo1     17047
11     Rec2 Estimulo1     17263
12     Rec2 Estimulo1     17533

我的观点是什么？我需要准确知道参与者（例如Rec1）花多少时间查看每个图像（Image1）。在这种情况下，Image1的时间戳开始于4.975秒，结束时为5.312秒，给出333毫秒

关键是我有数百张图片和数千名受访者花了不同时间观察图像。

有人有想法帮助我吗？

Answer 1

您可以使用MediaName包找到每个参与者（dplyr）和图片（library(dplyr) df3 <- df2 %>% dplyr::group_by(Recordig, MediaName) %>% dplyr::summarise(duration = diff(range(Timestamp))) df3 # Source: local data frame [4 x 3] # Groups: Recordig [?] # # Recordig MediaName duration # <fctr> <fctr> <dbl> # 1 Rec1 Estimulo1 964 # 2 Rec1 Imagem1 337 # 3 Rec2 Estimulo1 486 # 4 Rec2 Imagem1 516）的第一个和最后一个时间戳之间的差异：

List A
foreach x in A { variable b = x; => then some operation => print result}

Answer 2

我们可以使用function initMap() { var map = new google.maps.Map(document.getElementById('map'), { zoom: 17, clickableIcons: false, center: {lat: 34.04924594193164, lng: -118.24104309082031} }); var myMarker = new google.maps.Marker({ position: {lat: 34.04924594193164, lng: -118.24104309082031}, map: map, title: 'myMarker', draggable: false }); var trafficLayer = new google.maps.TrafficLayer(); trafficLayer.setMap(map); }

base R

R - 根据另一列中的值查找时间戳的开头和结尾

2 个答案: