大约有 47,000 项符合查询结果（耗时：0.0673秒） [XML]
Which one will execute faster, if (flag==0) or if (0==flag)?
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answered Jan 7 '11 at 11:03
Matthieu M.Matthieu M.
239k3434 gold badges342342 silver badges609609 bronze badges
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Split column at delimiter in data frame [duplicate]
....frame.
I added a "x|y" line to avoid ambiguities:
df <- data.frame(ID=11:13, FOO=c('a|b','b|c','x|y'))
foo <- data.frame(do.call('rbind', strsplit(as.character(df$FOO),'|',fixed=TRUE)))
Or, if you want to replace the columns in the existing data.frame:
within(df, FOO<-data.frame(do.cal...
Tricky Google interview question
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answered Mar 31 '11 at 21:35
user515430user515430
3,21122 gold badges1414 silver badges1212 bronze badges
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How to get device make and model on iOS?
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@"iPhone10,3" on iPhone X (CDMA)
@"iPhone10,6" on iPhone X (GSM)
@"iPhone11,2" on iPhone XS
@"iPhone11,4" on iPhone XS Max
@"iPhone11,6" on iPhone XS Max China
@"iPhone11,8" on iPhone XR
@"iPhone12,1" on iPhone 11
@"iPhone12,3" on iPhone 11 Pro
@"iPhone12,5" on iPhone 11 Pro Max
@"iPhone12,8" on i...
How can I confirm a database is Oracle & what version it is using SQL?
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answered Sep 19 '08 at 11:29
Tony AndrewsTony Andrews
119k1919 gold badges207207 silver badges246246 bronze badges
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Test for equality among all elements of a single vector
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edited Jan 21 '11 at 17:25
answered Jan 20 '11 at 21:06
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How to detect IE11?
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IE11 no longer reports as MSIE, according to this list of changes it's intentional to avoid mis-detection.
What you can do if you really want to know it's IE is to detect the Trident/ string in the user agent if navigator.appN...
Why is [1,2] + [3,4] = “1,23,4” in JavaScript?
... | string | string | string | string |
* applies to Chrome13, FF6, Opera11 and IE9. Checking other browsers and versions is left as an exercise for the reader.
Note: As pointed out by CMS, for certain cases of objects such as Number, Boolean and custom ones the + operator doesn't necessarily prod...
How can I round up the time to the nearest X minutes?
...cks * d.Ticks, dt.Kind);
}
Example:
var dt1 = RoundUp(DateTime.Parse("2011-08-11 16:59"), TimeSpan.FromMinutes(15));
// dt1 == {11/08/2011 17:00:00}
var dt2 = RoundUp(DateTime.Parse("2011-08-11 17:00"), TimeSpan.FromMinutes(15));
// dt2 == {11/08/2011 17:00:00}
var dt3 = RoundUp(DateTime.Parse(...
How to initialize an array in one step using Ruby?
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edited Oct 15 '18 at 12:11
Matilda Smeds
85688 silver badges1616 bronze badges
answered Feb 5 '11 at 1...