大约有 48,000 项符合查询结果（耗时：0.0609秒） [XML]
@ character before a function call
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Prefer to put zero, but if that works, great didn't know about it :)
– AntonioCS
Jan 5 '10 at 8:54
1
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Creating an R dataframe row-by-row
...as you need
stringsAsFactors=FALSE) # you don't know levels yet
and then during your operations insert row at a time
DF[i, ] <- list(1.4, "foo")
That should work for arbitrary data.frame and be much more efficient. If you overshot N you can always shrink empty rows...
How to add an empty column to a dataframe?
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@Griff - I've now updated my answer to be more accurate and explicit about version compatability issues. Thanks for highlighting this.
– emunsing
Nov 26 '19 at 21:36
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How do I restart a service on a remote machine in Windows? [closed]
...is gold. I have always been accessing servers remotely to handle services. Now with this I can have a list of different servers within the same console.
– Alan
Jul 19 '17 at 14:03
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How to suppress “unused parameter” warnings in C?
...tatic void UNUSED_FUNCTION(foo)(int bar) { ... }
Note 1):
As far as I know, MSVC doesn't have an equivalent to __attribute__((__unused__)).
Note 2):
The UNUSED macro won't work for arguments which contain parenthesis,so if you have an argument like float (*coords)[3] you can't do,float UNUSED...
month name to month number and vice versa in python
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# To get month name
In [2]: datetime.datetime.strftime(datetime.datetime.now(), '%a %b %d, %Y')
Out [2]: 'Thu Aug 10, 2017'
# To get just the month name, %b gives abbrevated form, %B gives full month name
# %b => Jan
# %B => January
dateteime.datetime.strftime(datetime_object, '%b')
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Using cURL with a username and password?
...equires a username/password. I'd like to try accessing it with curl. Right now I'm doing something like:
17 Answers
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align text center with android
I know it sounds easy. I need to put a text in center, but when the text is too long it needs to go below, but still align in the center of my xml.
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Measure the time it takes to execute a t-sql query
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@TheMoot I know I'm late but the MSDN links are perfect for your "[Subject] for Dummies" needs :). Try to take a look at this How To: Use SQL Profiler
– John Odom
Jan 22 '15 at 15:42
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Rails 4 image-path, image-url and asset-url no longer work in SCSS files
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Now this is how you write an answer. Each scenario. Predicting the "what ifs", no loose ends. A mark of someone who has "seen combat" (really worked through the problem).
– ahnbizcad
Nov...