大约有 44,000 项符合查询结果（耗时：0.0538秒） [XML]
What is the 'pythonic' equivalent to the 'fold' function from functional programming?
...better way to write your foldr: reduce(lambda y, x: x**y, reversed(a)). It now has a more natural usage, works with iterators, and consumes less memory.
– Mateen Ulhaq
Oct 20 '18 at 2:12
...
How to catch integer(0)?
...empty, cuz some functions return integer(0) instead of NA or NULL. But for now your way is the most straightforward, and works vector-wise which is a big advantage over length(a).
– Ufos
Feb 26 '18 at 9:54
...
Big-oh vs big-theta [duplicate]
...situations, I often see big-theta with the occasional big-oh thrown in.
I know mathematically what the difference is between the two, but in English, in what situation would using big-oh when you mean big-theta be incorrect, or vice versa (an example algorithm would be appreciated)?
...
Row count with PDO
...g an extra database query. I assume he has already done a select query and now wants to know how many rows were returned.
– nickf
May 19 '09 at 15:17
1
...
Access denied for user 'root'@'localhost' while attempting to grant privileges. How do I grant privi
...she does not have,
and the server seem to think something is not here ...
Now, what's missing then ?
On my system, I get this:
mysql> select version();
+------------+
| version() |
+------------+
| 5.5.21-log |
+------------+
1 row in set (0.00 sec)
mysql> SHOW GRANTS FOR 'root'@'localhos...
How can I get a Dialog style activity window to fill the screen?
...
Thanks, saved my time , nowhere I would have figured this out ! but any idea why we have to explicitly specify in code , why fill_parent does not work through xml for activities with theme dialog ?
– sat
Feb 8 ...
Fastest way to extract frames using ffmpeg?
...
Feb 2016: as of ffmpeg 2.1, the accurate seek option is now default - trac.ffmpeg.org/wiki/Seeking
– mafrosis
Feb 7 '16 at 7:19
1
...
Stop Excel from automatically converting certain text values to dates
Does anyone happen to know if there is a token I can add to my csv for a certain field so Excel doesn't try to convert it to a date?
...
How to get position of a certain element in strings vector, to use it as an index in ints vector?
...
To get a position of an element in a vector knowing an iterator pointing to the element, simply subtract v.begin() from the iterator:
ptrdiff_t pos = find(Names.begin(), Names.end(), old_name_) - Names.begin();
Now you need to check pos against Names.size() to see if...
Redis - Connect to Remote Server
...0
Then restart your service (service redis-server restart)
You can then now check that redis is listening on non-local interface with
redis-cli -h 192.168.x.x ping
(replace 192.168.x.x with your IP adress)
Important note : as several users stated, it is not safe to set this on a server which ...