R如何在不知道长度的情况下做出for循环? [英] R How to make a for loop without knowing the length?
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问题描述
我想使用来表示
我现在在做什么:
$ b $循环 b
shotchart < - data.frame(shot = as.vector(0),class = as.vector(0),data_homeaway = as.vector(0),
data_period = as.vector(0),player_id = as.vector(0),data_text = as.vector(0),
location = as.vector(0),gamenumber = as.vector(0) )
(i 1:54)
{
text< -paste0(// * [(@ class ='shots home-team')] / / * [(@ id)] [,i,])
shotchart [nrow(shotchart)+1,1]< - unlist(re $ findElement(using ='xpath',text)$ getElementAttribute('id'))
shotchart [nrow(shotchart),2]< - unlist(re $ findElement(using ='xpath',text)$ getElementAttribute('class'))
[nrow(shotchart),3]< -unlist(re $ findElement(using ='xpath',text)$ getE lementAttribute('data-homeaway'))
shotchart [nrow(shotchart),4]< -unlist(re $ findElement(using ='xpath',text)$ getElementAttribute('data-period'))
shotchart [nrow(shotchart),5]< -unlist(re $ findElement(using ='xpath',text)$ getElementAttribute('data-shooter'))
shotchart [nrow(shotchart), 6]< -unlist(re = findElement(using ='xpath',text)$ getElementAttribute('data-text'))
shotchart [nrow(shotchart),7]< -unlist(re $ findElement (使用='xpath',text)$ getElementAttribute('style'))
shotchart [nrow(shotchart),8]< -k-1
}
任何帮助将不胜感激。请让我知道是否需要进一步的信息。
解决方案
library(RSelenium)
checkForServer()
startServer()
Sys.sleep(5)
re <-remoteDriver()
re $ open()
re $ navigate() http://espn.go.com/mens-college-basketball/playbyplay?gameId=400830392)
shotchart< - data.frame(shot = as.vector(0),class = as.vector(0),data_homeaway = as.vector(0),
data_period = as.vector(0),player_id = as.vector(0),data_text = as.vector(0),
location = as.vector(0),gamenumber = as.vector(0))
error =错误:\ t摘要:NoSuchElement \ n \ t详细信息:元素无法找到org.openqa.selenium.NoSuchElementException\\\
i <-1
element = 0
while((i> ; 0)&(element [1]!= error))
{
text< -paste0(// * [(@ class ='shots home-team')] // * [(@id)] [ I,] )
元素< - 尝试(unlist(re $ findElement(using ='xpath',text)$ getElementAttribute('id')),silent = TRUE)
if(element [1] ==错误)
break;
shotchart [nrow(shotchart)+1,1]< - unlist(re $ findElement(using ='xpath',text)$ getElementAttribute('id'))
shotchart [nrow(shotchart) ,2]< - unlist(re $ findElement(using ='xpath',text)$ getElementAttribute('class'))
shotchart [nrow(shotchart),3]< -unlist(re $ findElement使用='xpath',text)$ getElementAttribute('data-homeaway'))
shotchart [nrow(shotchart),4]< -unlist(re $ findElement(using ='xpath',text)$ getElementAttribute ('data-period'))
shotchart [nrow(shotchart),5]< -unlist(re $ findElement(using ='xpath',text)$ getElementAttribute('data-shooter'))
shotchart [nrow(shotchart),6]< -unlist(re $ findElement(using ='xpath',text)$ getElementAttribute('data-text'))
shotchart [nrow(shotchart),7 ]< -unlist(re $ findElement(using ='xpath',text)$ getElementAttribute('style'))
shotchart [nrow(shotchart),8]< -i-1
i< ; -i + 1
}
我不确定变量k的意思。
我从所有的意见中得到了建议。
Currently on this site I am scraping in the shot chart information. To scrape in the info I need to make a for loop for however many shots there are. I find the number of shots by clicking "Team Stats" and finding the number of field goal attempts.
I would like to make the proper for loop
without having to find out the number of shots.
What I am currently doing:
shotchart <- data.frame(shot=as.vector(0), class=as.vector(0), data_homeaway=as.vector(0),
data_period=as.vector(0), player_id=as.vector(0), data_text=as.vector(0),
location=as.vector(0), gamenumber= as.vector(0))
for (i in 1:54)
{
text <-paste0("//*[(@class='shots home-team')]//*[(@id)][",i,"]")
shotchart[nrow(shotchart)+1,1]<- unlist(re$findElement(using='xpath',text)$getElementAttribute('id'))
shotchart[nrow(shotchart),2]<- unlist(re$findElement(using='xpath', text)$getElementAttribute('class'))
shotchart[nrow(shotchart),3]<-unlist(re$findElement(using='xpath', text)$getElementAttribute('data-homeaway'))
shotchart[nrow(shotchart),4]<-unlist(re$findElement(using='xpath', text)$getElementAttribute('data-period'))
shotchart[nrow(shotchart),5]<-unlist(re$findElement(using='xpath', text)$getElementAttribute('data-shooter'))
shotchart[nrow(shotchart),6]<-unlist(re$findElement(using='xpath', text)$getElementAttribute('data-text'))
shotchart[nrow(shotchart),7]<-unlist(re$findElement(using='xpath', text)$getElementAttribute('style'))
shotchart[nrow(shotchart),8]<-k-1
}
Any help will be appreciated. Please let me know if any further information is needed.
解决方案
library(RSelenium)
checkForServer()
startServer()
Sys.sleep(5)
re<-remoteDriver()
re$open()
re$navigate("http://espn.go.com/mens-college-basketball/playbyplay?gameId=400830392")
shotchart <- data.frame(shot=as.vector(0), class=as.vector(0), data_homeaway=as.vector(0),
data_period=as.vector(0), player_id=as.vector(0), data_text=as.vector(0),
location=as.vector(0), gamenumber= as.vector(0))
error="Error : \t Summary: NoSuchElement\n \t Detail: An element could not be located on the page using the given search parameters.\n \t class: org.openqa.selenium.NoSuchElementException\n"
i<-1
element=0
while ((i>0)&(element[1]!=error))
{
text <-paste0("//*[(@class='shots home-team')]//*[(@id)][",i,"]")
element<- try(unlist(re$findElement(using='xpath', text)$getElementAttribute('id')),silent = TRUE)
if (element[1]==error)
break;
shotchart[nrow(shotchart)+1,1]<- unlist(re$findElement(using='xpath',text)$getElementAttribute('id'))
shotchart[nrow(shotchart),2]<- unlist(re$findElement(using='xpath', text)$getElementAttribute('class'))
shotchart[nrow(shotchart),3]<-unlist(re$findElement(using='xpath', text)$getElementAttribute('data-homeaway'))
shotchart[nrow(shotchart),4]<-unlist(re$findElement(using='xpath', text)$getElementAttribute('data-period'))
shotchart[nrow(shotchart),5]<-unlist(re$findElement(using='xpath', text)$getElementAttribute('data-shooter'))
shotchart[nrow(shotchart),6]<-unlist(re$findElement(using='xpath', text)$getElementAttribute('data-text'))
shotchart[nrow(shotchart),7]<-unlist(re$findElement(using='xpath', text)$getElementAttribute('style'))
shotchart[nrow(shotchart),8]<-i-1
i<-i+1
}
I am not sure as what your variable k means.
I took advice from all the comments.
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