大约有 26,000 项符合查询结果（耗时：0.0515秒） [XML]
Replace all 0 values to NA
I have a dataframe with some numeric columns. Some row has a 0 value which should be considered as null in statistical analysis. What is the fastest way to replace all the 0 value to NULL in R?
...
How to call shell commands from Ruby
...
This explanation is based on a commented Ruby script from a friend of mine. If you want to improve the script, feel free to update it at the link.
First, note that when Ruby calls out to a shell, it typically calls /bin/sh, not Bash. Some Bash syntax is not ...
How to install python3 version of package via pip on Ubuntu?
...ckages of python3 after activating the virtualenv. So your system won't be messed up :)
This could be something like:
virtualenv -p /usr/bin/python3 py3env
source py3env/bin/activate
pip install package-name
share
...
How can I find out the current route in Rails?
...
Would you happen to know if this is the same/right way to do it in Rails 3? I'm sure it's still accessible, but I just want to be sure that I'm adhering to the latest conventions.
– John
Oct 29 '10 at 20:46
...
Convert list to array in Java [duplicate]
...; i < list.size(); i++) array[i] = list.get(i);
Update:
It is recommended now to use list.toArray(new Foo[0]);, not list.toArray(new Foo[list.size()]);.
From JetBrains Intellij Idea inspection:
There are two styles to convert a collection to an array: either using
a pre-sized array (l...
How can I round a number in JavaScript? .toFixed() returns a string?
Am I missing something here?
11 Answers
11
...
Webdriver Unable to connect to host 127.0.0.1 on port 7055 after 45000 ms
...
Don't know if you resolved this problem, but I have just resolved the same issue from the other side.
It appears Selenium and Firefox have difficulty talking to each other - I suspect Firefox 'evolve' changes over a number of releases, so backward and forward compatibility are not always guarant...
Checking if an object is a given type in Swift
...that is made up of AnyObject . I want to iterate over it, and find all elements that are array instances.
18 Answers
...
How to get name of calling function/method in PHP? [duplicate]
I am aware of function debug_backtrace , but I am looking for some ready to use implementation of function like GetCallingMethodName() ? It would be perfect if it gave method's class too (if it is indeed a method).
...
How to COUNT rows within EntityFramework without loading contents?
...o determine how to count the matching rows on a table using the EntityFramework.
7 Answers
...