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Should I implement __ne__ in terms of __eq__ in Python?
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ShadowRangerShadowRanger
94.9k88 gold badges104104 silver badges162162 bronze badges
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Are Javascript arrays sparse?
...0, 71,
72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83,
84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
96, 97, 98, 99,
... 16777116 more items
]
> console.log(`The script is using approximately ${Math.round(process.memoryUsage().heapUsed / 1024 / 1024 * 100) / 100} MB`);
The script is usi...
How to print a linebreak in a python function?
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>>> A = ['a1', 'a2', 'a3']
>>> B = ['b1', 'b2', 'b3']
>>> for x in A:
for i in B:
print ">" + x + "\n" + i
Outputs:
>a1
b1
>a1
b2
>a1
b3
>a2
b1
>a2
b2
>a2
b3
>a3
b1
>...
Convert data.frame column to a vector?
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You could use $ extraction:
class(aframe$a1)
[1] "numeric"
or the double square bracket:
class(aframe[["a1"]])
[1] "numeric"
share
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improve this answer
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Why use double indirection? or Why use pointers to pointers?
...3
pmgpmg
94.4k1010 gold badges110110 silver badges186186 bronze badges
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John Carmack's Unusual Fast Inverse Square Root (Quake III)
...y a polynomial sum:
y = f(x)
can be exactly transformed into:
y = a0 + a1*x + a2*(x^2) + a3*(x^3) + a4*(x^4) + ...
Where a0, a1, a2,... are constants. The problem is that for many functions, like square root, for exact value this sum has infinite number of members, it does not end at some x^n....
No appenders could be found for logger(log4j)?
...your classpath:
# Set root logger level to DEBUG and its only appender to A1.
log4j.rootLogger=DEBUG, A1
# A1 is set to be a ConsoleAppender.
log4j.appender.A1=org.apache.log4j.ConsoleAppender
# A1 uses PatternLayout.
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
log4j.appender.A1.layou...
代码块超过1.2w编译apk报错问题 - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
...tent-type:
text/x-gwt-rpc; charset=UTF-8
cookie:
Hm_lvt_8d287b854d737bdc880e8ddeac1b309d=1739864738,1739865332,1739865897,1741052932; HMACCOUNT=5A149F5C7832E7EE; auth=79402c20-42ad-45a8-8b74-ce0f12b2bdd5; Hm_lpvt_8d287b854d737bdc880e8ddeac1b309d=1741056573; AppInventor=AP6Lc4LezTGjCrPx-c09v__Ba9j...
How to use the 'sweep' function
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Rekyt
34411 silver badge88 bronze badges
answered May 3 '11 at 17:52
Daniele MericoDaniele Merico
8668...
Why can't I overload constructors in PHP?
...unc_array(array($this,$f),$a);
}
}
function __construct1($a1)
{
echo('__construct with 1 param called: '.$a1.PHP_EOL);
}
function __construct2($a1,$a2)
{
echo('__construct with 2 params called: '.$a1.','.$a2.PHP_EOL);
}
function __construct3...