大约有 47,000 项符合查询结果（耗时：0.0659秒） [XML]
HTML5 check if audio is playing?
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edited Feb 13 at 12:30
Edric
15.5k99 gold badges5656 silver badges7171 bronze badges
answered Feb 2...
Remove columns from dataframe where ALL values are NA
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160
Try this:
df <- df[,colSums(is.na(df))<nrow(df)]
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Find the files that have been changed in last 24 hours
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use "-mmin -120" instead of mtime
– Xavjer
Apr 18 '13 at 14:51
1
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Method Resolution Order (MRO) in new-style classes?
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answered Dec 4 '09 at 18:03
Alex MartelliAlex Martelli
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Search text in fields in every table of a MySQL database
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answered Mar 12 '09 at 17:00
MilhousMilhous
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Invalid argument supplied for foreach()
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530
Personally I find this to be the most clean - not sure if it's the most efficient, mind!
if (is...
Python time measure function
...et = f(*args)
time2 = time.time()
print '%s function took %0.3f ms' % (f.func_name, (time2-time1)*1000.0)
return ret
return wrap
And the usage is very simple, just use the @timing decorator:
@timing
def do_work():
#code
Python 3:
def timing(f):
def wrap(*args, **k...
What is WEB-INF used for in a Java EE web application?
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The Servlet 2.4 specification says this about WEB-INF (page 70):
A special directory exists within the application hierarchy named
WEB-INF. This directory contains all things related to the
application that aren’t in the document root of the application. The
WEB-INF node is...
How to store decimal values in SQL Server?
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DECIMAL(18,0) will allow 0 digits after the decimal point.
Use something like DECIMAL(18,4) instead that should do just fine!
That gives you a total of 18 digits, 4 of which after the decimal point (and 14 before the decimal point).
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How to find time complexity of an algorithm
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405
How to find time complexity of an algorithm
You add up how many machine instructions it wi...