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Select multiple columns in data.table by their numeric indices
...table)
dt <- data.table(a = 1, b = 2, c = 3)
# select single column by index
dt[, 2]
# b
# 1: 2
# select multiple columns by index
dt[, 2:3]
# b c
# 1: 2 3
# select single column by name
dt[, "a"]
# a
# 1: 1
# select multiple columns by name
dt[, c("a", "b")]
# a b
# 1: 1 2
Fo...
Setting href attribute at runtime
...
agree '.prop' will get full path like: http : //www.../index.html while .attr will get only: 'index.html'
– DevWL
Aug 28 '15 at 0:41
...
Multiple select statements in Single query
I am generating a report in php (mysql),
6 Answers
6
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Wait until all jQuery Ajax requests are done?
...d a ajax request to the queue like this:
$.ajaxQueue({
url: 'page.php',
data: {id: 1},
type: 'POST',
success: function(data) {
$('#status').html(data);
}
});
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Find nearest value in numpy array
...ray,value):
'''Given an ``array`` , and given a ``value`` , returns an index j such that ``value`` is between array[j]
and array[j+1]. ``array`` must be monotonic increasing. j=-1 or j=len(array) is returned
to indicate that ``value`` is out of range below and above respectively.'''
...
How can I easily fixup a past commit?
...iles --quiet || (echo Unstaged changes, please commit or stash with --keep-index; exit 1)) && COMMIT=$(git rev-parse $1) && git commit --fixup=$COMMIT && git rebase -i --autosquash $COMMIT~1' -"
Example usage:
git add -p
git fixup HEAD~5
However if you have unstaged chan...
WebSocket with SSL
... request where the WS server is running. e.g: ws://10.12.23.45:5641/server.php. and I know its a very bad solution - although, it works for me. I'd appreciate your help if you guide me through the apache configuration. e.g: where to put the .cert etc. thanks!
– muaaz
...
The order of elements in Dictionary
...ost cases wrong. It is neither Ordered by key or value, but by an internal Index. SortedDictionary is the one which is ordered in a way the user can manipulate (default key)
– Offler
May 29 '15 at 9:01
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Method overloading in Objective-C?
...that method overloading is not supported in Objective-C. It is similar to PHP in that sense. As he also points out, it is common practice to define two or more methods with different signatures in the manner he examples. However, it is also possible to create one method using the "id" type. Via ...
What is the maximum depth of the java call stack?
...f virtual memory allocated to the stack.
http://www.odi.ch/weblog/posting.php?posting=411
You can tune this with the -Xss VM parameter or with the Thread(ThreadGroup, Runnable, String, long) constructor.
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