这可以通过使用file.exists()函数来实现。该函数接受一个文件路径作为参数,并返回一个逻辑值,指示文件是否存在。下面是一个例子: # 检查文件是否存在file_path<-"data.xlsx"if(file.exists(file_path)){# 读取文件data<-read.xlsx(file_path)}else{# 文件不存在的处理逻辑print("文件不存在")} 1. 2. 3....
# (2) If no file name is specified, this procedure can be skipped. # File information of the system software on the file server. The file name extension is '.cc'. REMOTE_IMAGE = { 'product-name': { 'S6700' : { 'path': '/image/software_file_name.cc', 'sha256': '', }, ...
if (dir.exists("my_test_folder")) { print("The direcoty exists") } else { print("The file does not exist") } We get: [1] "The direcoty exists" Now, let’s do the following exercise. We will check if the directory exists and if not, then we will create a new one...
Info: Copying file flash:/sample.txt to flash:/test.txt...Done. delete 命令功能 delete命令用来删除设备存储设备中的指定文件。 命令格式 deletefilename delete /unreservedfilename delete /quietfilename delete /unreserved /quietfilename 参数说明 视图 用户视图 缺省级别 3: 管理级 使用指南 应用场景 执行...
Error in abs_path(input) : The file 'simulating-the-Roy-Rubin-Model-final.Rmd' does not exist. Calls: <Anonymous> -> setwd -> dirname -> abs_path In addition: Warning messages: 1: In file.create(to[okay]) : cannot create file 'simulating-the-Roy-Rubin-Model-final.Rmd', reason '...
If you wish to provide an HTML cheatsheet version, please create a Pull Request with a new.qmdfile in thehtml/directory of this repository. Use one of the existingqmdfiles there as a starting point/template. These should not be duplicates of the pdf versions - they should be text-based ...
>doWork<-function(filename){+if(file.exists(filename)){+"la la la"+}else{+warning("File does not exists: ",filename)+}+}>doWork("another file that doesn't exist")Warning message:IndoWork("another file that doesn't exist"):File does not exists:another file that doesn't exist ...
a .jar artifact to update my AWS lambda connections, but suddenly this past week whenever I click Build->Build artifacts..., the build fails with dozens of package R does not exist errors. When I do a regular build or run the app on my ...
_ldap._tcp Name does not exist _msdcs could not be resolved , DNS error _msdcs for domain.com in dns mgmt points to old, nonexistent server plus NO OTHER FOLDERS : The security descriptor propagation task could not calculate a new security descriptor for the following object. .bat file ...
_ldap._tcp Name does not exist _msdcs could not be resolved , DNS error _msdcs for domain.com in dns mgmt points to old, nonexistent server plus NO OTHER FOLDERS : The security descriptor propagation task could not calculate a new security descriptor for the following object. .bat file t...