我有这样的事情:
text <- "abcdefg"
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我想要这样的东西:
"abcde.fg"
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如何在不向向量分配新字符串的情况下实现此目的,text而是改变向量本身的元素?最后,我想随机插入点,实际上不是点,而是矢量的字符元素.
当我开发使用OpenCV的图像处理程序时,我通常可以看到' IPL_DEPTH_8U'或' IPL_DEPTH_16U'
但是,我不知道这是什么意思.
在图像处理的背景下,' 深度 ' 是什么意思?
我收集了一些推特数据:
#connect to twitter API
setup_twitter_oauth(consumer_key, consumer_secret, access_token, access_secret)
#set radius and amount of requests
N=200 # tweets to request from each query
S=200 # radius in miles
lats=c(38.9,40.7)
lons=c(-77,-74)
roger=do.call(rbind,lapply(1:length(lats), function(i) searchTwitter('Roger+Federer',
lang="en",n=N,resultType="recent",
geocode=paste (lats[i],lons[i],paste0(S,"mi"),sep=","))))
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在此之后我完成了:
rogerlat=sapply(roger, function(x) as.numeric(x$getLatitude()))
rogerlat=sapply(rogerlat, function(z) ifelse(length(z)==0,NA,z))
rogerlon=sapply(roger, function(x) as.numeric(x$getLongitude()))
rogerlon=sapply(rogerlon, function(z) ifelse(length(z)==0,NA,z))
data=as.data.frame(cbind(lat=rogerlat,lon=rogerlon))
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现在我想获得所有具有long和lat值的推文:
data=filter(data, !is.na(lat),!is.na(lon))
lonlat=select(data,lon,lat)
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但是现在我只获得了NA值....对这里出了什么问题的任何想法?
pvclust is great for cluster analysis in R. However, when running it as part of a batch operation, it is annoying to get different results for the same data. Obviously, there are many "correct" clusterings of the same data, and it seems that pvclust uses some randomness to determine the clusters of a specific run. But is there any way to get deterministic results?
I want to be able to present a minimal, repeatable analysis package: the data plus an …
我有一个脚本,我想在系统启动时运行,以便它始终可用.我很懒,不想每次都手动运行脚本.如何让脚本在启动时运行?
PHP代码:
foreach( )
{
if()
{
$title = $title . $sub['TITLE']."<br />";
}
}
echo '<a title="$title"> </a>';
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当我将光标放在锚标签中时,标题应该逐个显示
i.e A
b
c
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但它现在显示为
A <br />
B <br />
C <br />
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为什么破坏标签显示在这里?
而且我还需要知道如何删除<br/>ie只是<br/>字符串中的最后一个标签?
r ×3
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