大约有 5,100 项符合查询结果（耗时：0.0268秒） [XML]
What is an intuitive explanation of the Expectation Maximization technique? [closed]
...(pk)]
multinomial_coeff_denom= 0
prod_probs = 0
for x in range(0,len(obs)): # loop through state counts in each observation
multinomial_coeff_denom = multinomial_coeff_denom + math.log(math.factorial(obs[x]))
prod_probs = prod_probs + obs[x]*math.log(probs[x])
...
Convert seconds to Hour:Minute:Second
...ct(), DateTime::modify(), clone,
sprintf()
Run the Demo
MySQL example range of the result is constrained to that of the TIME data type, which is from -838:59:59 to 838:59:59 :
SELECT SEC_TO_TIME(8525);
# 02:22:05
See: SEC_TO_TIME
Run the Demo
PostgreSQL example:
SELECT TO_CHAR('8525 sec...
Most lightweight way to create a random string and a random hexadecimal number
...gt; t1 = timeit.Timer("''.join(random.choice('0123456789abcdef') for n in xrange(30))", "import random")
>>> t2 = timeit.Timer("binascii.b2a_hex(os.urandom(15))", "import os, binascii")
>>> t3 = timeit.Timer("'%030x' % random.randrange(16**30)", "import random")
>>> for t ...
Pairs from single list
...irwise(data):
zip(data[::2], data[1::2])
Example:
print(list(pairwise(range(10))))
Output:
[(0, 1), (2, 3), (4, 5), (6, 7), (8, 9)]
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How to delete files older than X hours
...onal values for mtime: find: argument to -mtime must be an integer in the range -2147483647 to 2147483647
– kbulgrien
Apr 16 at 9:27
...
Get day of week in SQL Server 2005/2008
... better solution:
MS SQL: Day of Week
The day of week will then be in the range 0 to 6, where 0 is Sunday, 1 is Monday, etc. Then you can use a simple case statement to return the correct weekday name.
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MySQL “between” clause not inclusive?
...ve, but dates with no time specified pad to 00:00:00. Comparing on a date range will therefore lose the last day. Either call DATE(dob) or specify the end of the day.
– wintermute92
Sep 20 '16 at 19:46
...
hexadecimal string to byte array in python
...e binary data using something like:
data = "fef0babe"
bits = ""
for x in xrange(0, len(data), 2)
bits += chr(int(data[x:x+2], 16))
This is probably not the fastest way (many string appends), but quite simple using only core Python.
...
time.sleep — sleeps thread or process?
... import Thread
class worker(Thread):
def run(self):
for x in xrange(0,11):
print x
time.sleep(1)
class waiter(Thread):
def run(self):
for x in xrange(100,103):
print x
time.sleep(5)
def run():
worker().start()
waiter(...
What are the calling conventions for UNIX & Linux system calls (and user-space functions) on i386 an
...ll, register %rax contains the result of
the system-call. A value in the range between -4095 and -1 indicates
an error, it is -errno.
Only values of class INTEGER or class MEMORY are passed to the kernel.
Remember this is from the Linux-specific appendix to the ABI, and even for Linux it...