我们可以使用grep
• str_detect(string, pattern, negate=FALSE): 检测是否存在匹配 • str_which(string, pattern, negate=FALSE): 查找匹配的索引 • str_count(string, pattern): 计算匹配的次数 • str_locate(string, pattern): 定位匹配的位置 • str_starts(string, pattern): 检测是否以pattern 开头 • str_...
raw%>% mutate( new_var_dup = case_id, # 完全复制 new_var_static = 7, # 新列全是7 new_var_static = new_var_static + 5, #用另外的变量计算新变量 new_var_paste = stringr::str_glue("{hospital} on ({date_hospitalisation})") # 两个变量的值贴一起形成...
select(contains("age")) 上面的代码会将所有包含“age”这个字符串的变量都筛出来;同样的道理我们还可以用ends_with() and starts_with()筛出来大型数据集中以某个字符开头和结尾的列,比如一个纵向随访数据集每一波的cesd都是以cesd开头为列名的我们就可以用starts_with()将所有随访的cesd都筛出来。还有matche...
也可以结合使用stringr的功能或正则表达式来对字符串列进行操作; 示例代码将返回动物名称的最后一个单词,并使其小写 msleep%>%select(name)%>%mutate(name_last_word=tolower(str_extract(name,pattern="\\w+$"))) name name_last_word<chr><chr>1 Cheetah cheetah ...
The Vote method in Figure 1 contains an interesting line of code after its call to AddVote: XML Copy Clients.All.updateVoteResults(id, votes); In SignalR, you’ll use the Clients property to access and call code on the client. From the Clients property, you can target the clients ...
Also the kernel log (dmesg) contains valuable log information. It is also possible to check the list of IPCPs running in the local system: $ sudo rlite-ctl ipcps-show or see the flows allocated in the local system (in this case the 0-flows provided by the shim DIFs, which are ...
This section contains issues with Microsoft Azure. FileLoadException when hosting SignalR in an Azure Worker Role Hosting SignalR in an Azure Worker Role might result in the exception "Could not load file or assembly 'Microsoft.Owin, Version=2.0.0.0". This is a known issue with NuGet; Bindi...
rights policy template:An XrML 1.2 document that contains a predefined usage policy that is used to create thePLwhen content is protected. Conceptually, arights policy template(or "template") is a blueprint for aPL, identifying authorized users and the actions they are authorized to take with ...
String,System.Object>>.Contains Method (System.ServiceModel.Channels) Notifications Notifications ITextHost INameSpaceTreeControlDropHandler Application Support IIOCancelInformation Edit Controls Reference MSMQQueueInfos.Next Intsafe.h Functions EodLastAckTime How-To Develop Snap-ins Using MMC Calendar ...