大约有 44,000 项符合查询结果（耗时：0.0870秒） [XML]
How to join (merge) data frames (inner, outer, left, right)
...
By using the merge function and its optional parameters:
Inner join: merge(df1, df2) will work for these examples because R automatically joins the frames by common variable names, but you would most likely want to specify merge(df1, df2, by = "Custome...
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock'
I installed LAMP on Ubuntu 12.04 LTS (Precise Pangolin) and then set root password on phpMyAdmin . I forgot the password and now I am unable to login. When I try to change password through terminal I get:
...
Rails: fields_for with index?
...uestion do |fq| %>
# here you have both the 'question' object and the current 'index'
<% end %>
<% end %>
From:
http://railsapi.com/doc/rails-v3.0.4/classes/ActionView/Helpers/FormHelper.html#M006456
It’s also possible to specify the
instance to be used:
<%= fo...
How do I install from a local cache with pip?
...irtualenv environments. Is there a way that I can download a package once and then have pip install from a local cache?
...
Iterate over model instance field names and values in template
... instance's field values, along with their names. Think of it as just a standard output of the values of that instance in table format, with the field name (verbose_name specifically if specified on the field) in the first column and the value of that field in the second column.
...
Git: copy all files in a directory from another branch
... -c $COMMIT_SHA1 --reset-author; where $COMMIT_SHA1 could be like branch_a and would be the commit object which has the commit message you want. I don't know offhand how to programmatically determine the commit with most recent change to dirname
– Alexander Bird
...
In Vim, I'd like to go back a word. The opposite of `w`
...
Use b to go back a word.
You may also want to check out W and B to advance/go back a WORD (which
consists of a sequence of non-blank characters separated with white space, according to :h WORD).
share
...
Sending data back to the Main Activity in Android
I have two activities: main activity and child activity.
When I press a button in the main activity, the child activity is launched.
...
codestyle; put javadoc before or after annotation?
... before or after the annotation. What would we want to adopt as a coding standard?
5 Answers
...
How to scroll the window using JQuery $.scrollTo() function
...
Note if you want to scroll the whole page and not individual element, use $('html, body') just like Tim has pointed here. Just $('body') will not work in all browsers.
– i--
Mar 28 '13 at 21:28
...