大约有 45,000 项符合查询结果（耗时：0.0146秒） [XML]
What are some alternatives to ReSharper? [closed]
...nswered Sep 16 '10 at 15:19
iggi123iggi123
11111 silver badge22 bronze badges
...
SQL query for finding records where count > 1
...p int(11) not null,
dt date not null
);
insert into payment values
(1,123,55555,'2009-12-12'),
(1,123,66666,'2009-12-12'),
(1,123,77777,'2009-12-13'),
(2,456,77777,'2009-12-14'),
(2,456,77777,'2009-12-14'),
(2,789,77777,'2009-12-14'),
(2,789,77777,'2009-12-14');
select foo.user_id, foo.cnt fro...
Cache busting via params
...
The param ?v=1.123 indicates a query string, and the browser will therefore think it is a new path from, say, ?v=1.0. Thus causing it to load from file, not from cache. As you want.
And, the browser will assume that the source will stay t...
Build an ASCII chart of the most commonly used words in a given text [closed]
...
123
votes
LabVIEW 51 nodes, 5 structures, 10 diagrams
Teaching the elephant to tap-d...
C# using streams
...sfer the strings to and from the stream as bytes. So
myStreamWriter.Write(123);
will write "123" (three characters '1', '2' then '3') to the stream. If you're dealing with text files (e.g. html), StreamReader and StreamWriter are the classes you would use.
Whereas
myBinaryWriter.Write(123);
w...
Validate that a string is a positive integer
...ue);
},
false
);
test("1", true);
test("1.23", false);
test("1234567890123", true);
test("1234567890123.1", false);
test("0123", false); // false because we don't handle leading 0s
test(" 123 ", false); // false because we don't handle whitespace
<label>
String:
<inp...
AngularJS : Factory and Service? [duplicate]
...module('myApp').factory('myFactory', function() {
var _myPrivateValue = 123;
return {
privateValue: function() { return _myPrivateValue; }
};
});
// Service
function MyService() {
this._myPrivateValue = 123;
}
MyService.prototype.privateValue = function() {
return this._myPrivate...
How to remove the hash from window.location (URL) with JavaScript without page refresh?
...
This will remove the trailing hash as well.
eg: http://test.com/123#abc -> http://test.com/123
if(window.history.pushState) {
window.history.pushState('', '/', window.location.pathname)
} else {
window.location.hash = '';
}
...
Remove duplicated rows using dplyr
...ction for this purpose.
Original answer below:
library(dplyr)
set.seed(123)
df <- data.frame(
x = sample(0:1, 10, replace = T),
y = sample(0:1, 10, replace = T),
z = 1:10
)
One approach would be to group, and then only keep the first row:
df %>% group_by(x, y) %>% filter(row_nu...
How to hide the “back” button in UINavigationController?
...nswered Dec 11 '13 at 8:02
mattv123mattv123
89988 silver badges1313 bronze badges
...