尝试在 R 中使用 read_xml 函数并获取 0 列表时出现问题？
Issue with trying to use read_xml function in R and getting a List of 0?
我有一个正在处理的 .xml 文件，它看起来有点乱。我正在尝试获取名为“x1”、“y1”、“x2”、“y2”的四列的四列数据框。抱歉，我无法附上 xml 文件，但这里是文本文件。
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但是，我得到的 vertices_42350 列表为 0。这是我用来尝试此操作的代码：
library(xml2) # Loads the xml2 package
library(tidyverse) # Loads the tidyverse package
vertices_42350 <- read_xml("42350.xml") %>% xml_find_all('.//Vertices') # calling xml file from directory
xy_data_42350 <-
tibble(
x1 = vertices_42350 %>% xml_find_all('./*[1]') %>% xml_attr('X'),
y1 = vertices_42350 %>% xml_find_all('./*[1]') %>% xml_attr('Y'),
x2 = vertices_42350 %>% xml_find_all('./*[2]') %>% xml_attr('X'),
y2 = vertices_42350 %>% xml_find_all('./*[2]') %>% xml_attr('Y')
) %>%
mutate_all(as.integer)
有什么想法吗？我认为这与 xml_find_all?
有关
这是一个将所有 X&Y 值分成两半并重新组合成最终数据帧的解决方案。
#find all of the attributes values (list of x & y values)
values <-file %>% xml_find_all(".//Vertices") %>% xml_find_all(".//V") %>% xml_attrs()
#bind into a data frame and alternate naming rows
values <-bind_rows(values) %>%
mutate_all(as.integer)
rownumbers <- rep(c(1,2), (nrow(values)/2))
#split by the odd and even rows and bind into final answer
#make unique column names
answer <- cbind(values[rownumbers==1,], values[rownumbers==2,])
names(answer) <- make.names(names(answer), unique = TRUE)
我有一个正在处理的 .xml 文件，它看起来有点乱。我正在尝试获取名为“x1”、“y1”、“x2”、“y2”的四列的四列数据框。抱歉，我无法附上 xml 文件，但这里是文本文件。
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但是，我得到的 vertices_42350 列表为 0。这是我用来尝试此操作的代码：
library(xml2) # Loads the xml2 package
library(tidyverse) # Loads the tidyverse package
vertices_42350 <- read_xml("42350.xml") %>% xml_find_all('.//Vertices') # calling xml file from directory
xy_data_42350 <-
tibble(
x1 = vertices_42350 %>% xml_find_all('./*[1]') %>% xml_attr('X'),
y1 = vertices_42350 %>% xml_find_all('./*[1]') %>% xml_attr('Y'),
x2 = vertices_42350 %>% xml_find_all('./*[2]') %>% xml_attr('X'),
y2 = vertices_42350 %>% xml_find_all('./*[2]') %>% xml_attr('Y')
) %>%
mutate_all(as.integer)
有什么想法吗？我认为这与 xml_find_all?
有关这是一个将所有 X&Y 值分成两半并重新组合成最终数据帧的解决方案。
#find all of the attributes values (list of x & y values)
values <-file %>% xml_find_all(".//Vertices") %>% xml_find_all(".//V") %>% xml_attrs()
#bind into a data frame and alternate naming rows
values <-bind_rows(values) %>%
mutate_all(as.integer)
rownumbers <- rep(c(1,2), (nrow(values)/2))
#split by the odd and even rows and bind into final answer
#make unique column names
answer <- cbind(values[rownumbers==1,], values[rownumbers==2,])
names(answer) <- make.names(names(answer), unique = TRUE)