大约有 40,000 项符合查询结果（耗时：0.0584秒） [XML]
mongodb count num of distinct values per field/key
...}
},
{ $unwind: "$keywords" },
{
$group: {
_id: {$toLower: '$keywords'},
count: { $sum: 1 }
}
},
{
$match: {
count: { $gte: 2 }
}
},
{ $sort : { count : -1} },
{ $limit : 100 }
]);
that give result ...
Rails 3 check if attribute changed
...
I gonna try to use some test lib for this. may be a workaround, anyway TY
– Mauro Dias
May 17 '13 at 6:59
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Passing command line arguments to R CMD BATCH
...command line
$ R CMD BATCH --no-save --no-restore '--args a=1 b=c(2,5,6)' test.R test.out &
Test.R
##First read in the arguments listed at the command line
args=(commandArgs(TRUE))
##args is now a list of character vectors
## First check to see if arguments are passed.
## Then cycle through...
Deleting multiple elements from a list
...somelist[0] , followed by del somelist[2] , the second statement will actually delete somelist[3] .
30 Answers
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Node.js vs .Net performance
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I did a rudimentary performance test between nodejs and IIS.
IIS is about 2.5 times faster than nodejs when dishing out "hello, world!".
code below.
my hardware:
Dell Latitude E6510, Core i5 (dual core), 8 GB RAM, Windows 7 Enterprise 64 bit OS
node serve...
How do I call setattr() on the current module?
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import sys
thismodule = sys.modules[__name__]
setattr(thismodule, name, value)
or, without using setattr (which breaks the letter of the question but satisfies the same practical purposes;-):
globals()[name] = value
Note: at module scope, the latter is eq...
How to pass object with NSNotificationCenter
...ing end you can access the userInfo dictionary as follows:
-(void) receiveTestNotification:(NSNotification*)notification
{
if ([notification.name isEqualToString:@"TestNotification"])
{
NSDictionary* userInfo = notification.userInfo;
NSNumber* total = (NSNumber*)userInfo[@"t...
Angularjs minify best practice
...since Angular 1.3.1 you can turn off implicit dependency injection, it's really helpful to solve potential problems with renaming at once (before minification).
Turning off implicit DI, using strictDi config property:
angular.bootstrap(document, ['myApp'], {
strictDi: true
});
Turning off im...
How does one remove an image in Docker?
...
Try docker rmi node. That should work.
Seeing all created containers is as simple as docker ps -a.
To remove all existing containers (not images!) run docker rm $(docker ps -aq)
share
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How to handle WndProc messages in WPF?
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Actually, as far as I understand such a thing is indeed possible in WPF using HwndSource and HwndSourceHook. See this thread on MSDN as an example. (Relevant code included below)
// 'this' is a Window
HwndSource source = HwndSou...