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Creating an empty list in Python
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answered Jun 4 '10 at 7:29
unutbuunutbu
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Android: Expand/collapse animation
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744
I see that this question became popular so I post my actual solution. The main advantage is tha...
What is the difference between Left, Right, Outer and Inner Joins?
...ve 100 students, 70 of which have lockers. You have a total of 50 lockers, 40 of which have at least 1 student and 10 lockers have no student.
INNER JOIN is equivalent to "show me all students with lockers".
Any students without lockers, or any lockers without students are missing.
Returns 70 rows
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Log to the base 2 in python
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unutbuunutbu
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Difference between Math.Floor() and Math.Truncate()
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492
Math.Floor rounds down, Math.Ceiling rounds up, and Math.Truncate rounds towards zero. Thus, M...
Fast ceiling of an integer division in C / C++
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401
For positive numbers
unsigned int x, y, q;
To round up ...
q = (x + y - 1) / y;
or (avoi...
Finding what methods a Python object has
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546
For many objects, you can use this code, replacing 'object' with the object you're interested i...
Numpy first occurrence of value greater than existing value
...t save another list.
In [2]: N = 10000
In [3]: aa = np.arange(-N,N)
In [4]: timeit np.argmax(aa>N/2)
100000 loops, best of 3: 52.3 us per loop
In [5]: timeit np.where(aa>N/2)[0][0]
10000 loops, best of 3: 141 us per loop
In [6]: timeit np.nonzero(aa>N/2)[0][0]
10000 loops, best of 3: 1...
generate days from date range
... union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as a
cross join (select 0 as a union all select 1 union all select 2 union all select 3 union all select 4 union all select...
How can building a heap be O(n) time complexity?
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490
I think there are several questions buried in this topic:
How do you implement buildHeap so i...