大约有 47,000 项符合查询结果（耗时：0.1372秒） [XML]
Ruby Hash to array of values
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Ray ToalRay Toal
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How to generate service reference with only physical wsdl file
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Ant RadhaAnt Radha
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How can I convert this foreach code to Parallel.ForEach?
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edited Jul 26 '13 at 9:06
Contango
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How to add new item to hash
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307
Create the hash:
hash = {:item1 => 1}
Add a new item to it:
hash[:item2] = 2
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How to initialize a two-dimensional array in Python?
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383
A pattern that often came up in Python was
bar = []
for item in some_iterable:
bar.append...
PowerShell: Store Entire Text File Contents in Variable
...ldsmanojlds
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Storing Python dictionaries
...ckle save:
try:
import cPickle as pickle
except ImportError: # Python 3.x
import pickle
with open('data.p', 'wb') as fp:
pickle.dump(data, fp, protocol=pickle.HIGHEST_PROTOCOL)
See the pickle module documentation for additional information regarding the protocol argument.
Pickle load:...
Python str vs unicode types
... ways into a sequence of binary data represented via str.
Note: In Python 3, unicode was renamed to str and there is a new bytes type for a plain sequence of bytes.
Some differences that you can see:
>>> len(u'à') # a single code point
1
>>> len('à') # by default utf-8 ->...
arrayfun can be significantly slower than an explicit loop in matlab. Why?
...ng out the computations, instead of using a function in your loop
tic
Soln3 = ones(T, N);
for t = 1:T
for n = 1:N
Soln3(t, n) = 3*x(t, n)^2 + 2*x(t, n) - 1;
end
end
toc
Time to compute on my computer:
Soln1 1.158446 seconds.
Soln2 10.392475 seconds.
Soln3 0.239023 seconds.
Oli...
How to round a number to significant figures in Python
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You can use negative numbers to round integers:
>>> round(1234, -3)
1000.0
Thus if you need only most significant digit:
>>> from math import log10, floor
>>> def round_to_1(x):
... return round(x, -int(floor(log10(abs(x)))))
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>>> round_to_1(0.0232)...