大约有 43,000 项符合查询结果（耗时：0.0306秒） [XML]
switch / pattern matching idea
...tPrice (v : Vehicle) =
match v with
| :? Motorcycle as bike -> 100 + bike.Cylinders * 10
| :? Bicycle -> 30
| :? Car as car when car.EngineType = Diesel -> 220 + car.Doors * 20
| :? Car as car when car.EngineType = Gasoline -> 200 + car.Doors * 20
| _ -> failw...
How to get an IFrame to be responsive in iOS Safari?
...onsive as well. In theory it's simple, simply aider use <iframe width="100%"></iframe> or set the CSS width to iframe { width: 100%; } however in practice it's not quite that simple, but it can be.
...
Return multiple columns from pandas apply()
..._test['size'].apply(sizes))
Test result are:
Separate df.apply():
100 loops, best of 3: 1.43 ms per loop
Return Series:
100 loops, best of 3: 2.61 ms per loop
Return tuple:
1000 loops, best of 3: 819 µs per loop
...
Understanding exactly when a data.table is a reference to (vs a copy of) another data.table
...nspect(DT))
# @0000000003B7E2A0 19 VECSXP g0c7 [OBJ,NAM(2),ATT] (len=2, tl=100)
# @00000000040C2288 14 REALSXP g0c2 [NAM(2)] (len=2, tl=0) 1,2
# @00000000040C2250 14 REALSXP g0c2 [NAM(2)] (len=2, tl=0) 11,12
# ATTRIB: # ..snip..
.Internal(inspect(newDT)) # precisely the same object at this p...
jQuery on window resize
... ,"f50" : function(){ alert(50); }
,"f100" : function(){ alert(100); }
,"f500" : function(){ alert(500); }
,"f1000" : function(){ alert(1000);}
};
//---------------------
$(wi...
What really is a deque in STL?
...ircular buffer, nothing more. Assume you have a regular vector of capacity 1000 with 100 elements in it at positions 0 to 99. Now when a push_Front happens you just push at the end i.e. at position 999, then 998 etc. until the two ends meet. Then you reallocate (with exponential growth to guarantee ...
How can I convert a zero-terminated byte array to string?
I need to read [100]byte to transfer a bunch of string data.
13 Answers
13
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How do I uniquely identify computers visiting my web site?
...sitors will probably have flash)
You can store more data per cookie (up to 100 KB)
Shared across browsers, so more likely to uniquely identify a machine
Clearing the browser cookies does not remove the flash cookies.
You'll need to build a small (hidden) flash movie to read and write them.
Whatev...
Pandas: Setting no. of max rows
... IPython.display import display
with pd.option_context('display.max_rows', 100, 'display.max_columns', 10):
display(df) #need display to show the dataframe when using with in jupyter
#some pandas stuff
You can also reset an option back to its default value like this:
pd.reset_option('disp...
What are the use cases for selecting CHAR over VARCHAR in SQL?
...er set) storing the word "FooBar"
CHAR(6) = 6 bytes (no overhead)
VARCHAR(100) = 8 bytes (2 bytes of overhead)
CHAR(10) = 10 bytes (4 bytes of waste)
The bottom line is CHAR can be faster and more space-efficient for data of relatively the same length (within two characters length difference).
Not...