R中的错误:没有适用于' st_centroid'的方法应用于类的对象" NULL"

时间:2018-01-25 22:25:43

标签: r dplyr purrr sf

编辑:我后来意识到错误发生在我的完整数据集中,而不是代码中。我很抱歉。这可能对其他人有用,也可能没用。

我有一个叫做几何'几何'这是多边形(我使用sf空间包)。我正在尝试向每个多边形的质心的tibble添加一列。但是,我收到一个错误:" mutate_impl(.data,dots)中的错误:   评估错误:没有适用于' st_centroid'应用于类的对象" NULL"。"我已经看过一些关于类似主题的其他帖子,但不太相似,我无法弄明白。如果我错过了什么,我道歉!

我是新手使用烟斗和tidyverse,所以也许出现了问题。任何帮助将不胜感激!

以下是我的代码示例:

center1 = function(df){ centroid = st_centroid(df) }

table2 = x %>% mutate(center.1 =map(geometry, center1))

这是我的数据的一个非常小的样本(只有一行) - 代码中的变量x(对不起长度!):我有tidyverse,tibble,dplyr,purrr和sf加载。

x=structure(list(segnum = 428, system.time_start = 951350400000, 
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), row.names = c(NA, -1L), class = c("tbl_df", "tbl", "data.frame"
))

2 个答案:

答案 0 :(得分:1)

您的示例使用table$geometry内的map。相反,请使用geometry

table2 = x %>%
  mutate(center.1 = map(geometry, center1))

答案 1 :(得分:1)

不能只是这样做:

count is 1
thread1 reads count 1 into local var x
thread2 reads count 1 into local var y
thread1 increments x to 2
thread1 writes x value 2 to count
thread2 increments y to 2
thread2 writes the y value 2 to count