大约有 16,800 项符合查询结果（耗时：0.0325秒） [XML]
How do I replace NA values with zeros in an R dataframe?
I have a data frame and some columns have NA values.
21 Answers
21
...
Clean way to launch the web browser from shell script?
In a bash script, I need to launch the user web browser. There seems to be many ways of doing this:
6 Answers
...
Compare two files line by line and generate the difference in another file
I want to compare file1 with file2 and generate a file3 which contains the lines in file1 which are not present in file2.
1...
Library not loaded: libmysqlclient.16.dylib error when trying to run 'rails server' on OS X 10.6 wit
I've been struggling with this for some time.
24 Answers
24
...
.htaccess redirect all pages to new domain
Which redirect rule would I use to redirect all pages under olddomain.example to be redirected to newdomain.example ?
18...
Introducing FOREIGN KEY constraint may cause cycles or multiple cascade paths - why?
I've been wrestling with this for a while and can't quite figure out what's happening. I have a Card entity which contains Sides (usually 2) - and both Cards and Sides have a Stage. I'm using EF Codefirst migrations and the migrations are failing with this error:
...
Decode Base64 data in Java
I have an image that is Base64 encoded. What is the best way to decode that in Java? Hopefully using only the libraries included with Sun Java 6.
...
Check image width and height before upload with Javascript
I have a JPS with a form in which a user can put an image:
8 Answers
8
...
“Parse Error : There is a problem parsing the package” while installing Android application
I got this error while installing the android application ( Parse Error : There is a problem parsing the package. ). I did the following steps.
...
Failed to import new Gradle project: failed to find Build Tools revision *.0.0
When I boot up Android Studio and select "New Project..." and go through creating a new project, I get this popup error:
14...