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Using numpy to build an array of all combinations of two arrays
... faster implementation:
@pv's solution
In [113]:
%timeit cartesian(([1, 2, 3], [4, 5], [6, 7]))
10000 loops, best of 3: 135 µs per loop
In [114]:
cartesian(([1, 2, 3], [4, 5], [6, 7]))
Out[114]:
array([[1, 4, 6],
[1, 4, 7],
[1, 5, 6],
[1, 5, 7],
[2, 4, 6],
[2...
What’s the difference between “Array()” and “[]” while declaring a JavaScript array?
...
962
There is a difference, but there is no difference in that example.
Using the more verbose metho...
Clojure 1.2.1/1.3/1.4 'proxy generated in Grails 2.0.0 runtime fails. 1.2.0 is fine
I'm working on extending the Grails Clojure plugin in Grails 2.0.0 (and 2.1.0-SNAPSHOT) and I wanted to update it to Clojure 1.3.0 and add clojure.tools.logging .
...
How exactly does tail recursion work?
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answered Mar 20 '13 at 9:11
Alexey FrunzeAlexey Frunze
56.8k99 gold badges6767 silver badges154154 bronze badges
...
Get top n records for each group of grouped results
... select *
from mytable
where `group` = 1
order by age desc
LIMIT 2
)
UNION ALL
(
select *
from mytable
where `group` = 2
order by age desc
LIMIT 2
)
There are a variety of ways to do this, see this article to determine the best route for your situation:
http://www.xaprb.com/b...
Convert integer to binary in C#
... a binary string.
int value = 8;
string binary = Convert.ToString(value, 2);
Which returns 1000.
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Determine the data types of a data frame's columns
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220
Your best bet to start is to use ?str(). To explore some examples, let's make some data:
s...
Detect Retina Display
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295
In order to detect the Retina display reliably on all iOS devices, you need to check if the de...
Python integer division yields float
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292
Take a look at PEP-238: Changing the Division Operator
The // operator will be available t...
逆向工程——二进制炸弹(CSAPP Project) - 操作系统(内核) - 清泛网 - 专注...
...两个字符串，然后比较它们是否相等吗？
可以看到0x8048b22和0x8048b27指令中分别放入了两个字符串，一个在地址0x8049678中，另一个在0x8(%ebp)中。而0x8(%ebp)是函数phase_1的参数，所以依此可以判断0x8(%ebp)的内存地址中的值是我们输入...