大约有 5,500 项符合查询结果（耗时：0.0275秒） [XML]
HashSet versus Dictionary w.r.t searching time to find if an item exists
...
HashSet vs List vs Dictionary performance test, taken from here.
Add 1000000 objects (without checking duplicates)
Contains check for half the objects of a collection of 10000
Remove half the objects of a collection of 10000
...
How do I expand the output display to see more columns of a pandas DataFrame?
...)
pd.set_option('display.max_columns', 500)
pd.set_option('display.width', 1000)
Here is the help for set_option:
set_option(pat,value) - Sets the value of the specified option
Available options:
display.[chop_threshold, colheader_justify, column_space, date_dayfirst,
date_yearfirst, e...
Execute Insert command and return inserted Id in Sql
...E t7;
GO
CREATE TABLE t6(id int IDENTITY);
CREATE TABLE t7(id int IDENTITY(100,1));
GO
CREATE TRIGGER t6ins ON t6 FOR INSERT
AS
BEGIN
INSERT t7 DEFAULT VALUES
END;
GO
--End of trigger definition
SELECT id FROM t6;
--IDs empty.
SELECT id FROM t7;
--ID is empty.
--Do the following in Session 1
...
How to implement the activity stream in a social network
... enough for most of the commonly-hit screens on your site. The most recent 100 for each user or something like that. With Redis in the mix, it might work like this:
Create your MySQL activity record
For each friend of the user who created the activity, push the ID onto their activity list in Redis...
How do I prompt for Yes/No/Cancel input in a Linux shell script?
...ar:
dialog --gauge "Filling the tank" 20 60 0 < <(
for i in {1..100};do
printf "XXX\n%d\n%(%a %b %T)T progress: %d\nXXX\n" $i -1 $i
sleep .033
done
)
Little demo:
#!/bin/sh
while true ;do
[ -x "$(which ${DIALOG%% *})" ] || DIALOG=dialog
DIALOG=$($DIALOG --m...
How are 3D games so efficient? [closed]
... a rather old, flickering CRT or a common LCD display. On a CRT running at 100Hz you will probably see framerates of up to 100Hz. VSync also applies in a similar way to LCD displays (they usually have a refresh rate of 60Hz).
So, the teapot demo may actually run much more efficient! If it uses 30% ...
What is the difference between a field and a property?
...Note that the given example doesn't encapsulate squat. This property gives 100 % full access to the private field, so this isn't object-oriented at all. You might as well have a public field in this case. Granted, it helps (marginally) to refactor code in the future, but any IDE worth it's mettle ca...
dd: How to calculate optimal blocksize? [closed]
...f=/dev/zero of=zero bs=8M; rm zero
I experimented with values from 4K to 100M.
After letting dd to run for a while I killed it (Ctlr+C) and read the output:
36+0 records in
36+0 records out
301989888 bytes (302 MB) copied, 15.8341 s, 19.1 MB/s
As dd displays the input/output rate (19.1MB/s in ...
Python vs Bash - In which kind of tasks each one outruns the other performance-wise? [closed]
...has. IFS, CDPATH.. thousands of them.
If one writing a script bigger than 100 LOC: choose Python
If one need path manipulation in script: choose Python(3)
If one need somewhat like alias but slightly complicated: choose Bash/sh
Anyway, one should try both sides to get the idea what are they capa...
Is floating-point math consistent in C#? Can it be?
...
+100
I know of no way to way to make normal floating points deterministic in .net. The JITter is allowed to create code that behaves diff...