大约有 43,410 项符合查询结果（耗时：0.0373秒） [XML]
How do I check which version of NumPy I'm using?
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392
import numpy
numpy.version.version
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SQL RANK() versus ROW_NUMBER()
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ROW_NUMBER : Returns a unique number for each row starting with 1. For rows that have duplicat...
Is there a better way to iterate over two lists, getting one element from each list for each iterati
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264
This is as pythonic as you can get:
for lat, long in zip(Latitudes, Longitudes):
print la...
How to create an object for a Django model with a many to many field?
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248
You cannot create m2m relations from unsaved objects. If you have the pks, try this:
sample_o...
In c# is there a method to find the max of 3 numbers?
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142
Well, you can just call it twice:
int max3 = Math.Max(x, Math.Max(y, z));
If you find yoursel...
What would cause an algorithm to have O(log n) complexity?
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290
I have to agree that it's pretty weird the first time you see an O(log n) algorithm... where o...
Weighted random numbers
...e items have individual weights:
1) calculate the sum of all the weights
2) pick a random number that is 0 or greater and is less than the sum of the weights
3) go through the items one at a time, subtracting their weight from your random number, until you get the item where the random number is ...
Pandas: create two new columns in a dataframe with values calculated from a pre-existing column
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2 Answers
2
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Iterating over Java collections in Scala
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There is a wrapper class (scala.collection.jcl.MutableIterator.Wrapper). So if you define
imp...
Sorting arrays in NumPy by column
...ck example, to sort it and return a copy:
In [1]: import numpy as np
In [2]: a = np.array([[1,2,3],[4,5,6],[0,0,1]])
In [3]: np.sort(a.view('i8,i8,i8'), order=['f1'], axis=0).view(np.int)
Out[3]:
array([[0, 0, 1],
[1, 2, 3],
[4, 5, 6]])
To sort it in-place:
In [6]: a.view('i8,i8...