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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...
how to check the dtype of a column in python pandas
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127
You can access the data-type of a column with dtype:
for y in agg.columns:
if(agg[y].dtype...
What do all of Scala's symbolic operators mean?
...to look for them. Or, failing that, look at the index (presently broken on 2.9.1, but available on nightly).
Every Scala code has three automatic imports:
// Not necessarily in this order
import _root_.java.lang._ // _root_ denotes an absolute path
import _root_.scala._
import _root_.scala.Pr...
How to make lists contain only distinct element in Python? [duplicate]
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278
The simplest is to convert to a set then back to a list:
my_list = list(set(my_list))
One d...
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 ...
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...
Centering the pagination in bootstrap
...t;
<li><a href="?p=1" data-original-title="" title="">2</a></li>
</ul>
</div>
Bootstrap 4 has new class
<div class="text-xs-center">
<ul class="pagination">
<li><a href="?p=0" data-original-title="" title="">1&l...
Pandas: create two new columns in a dataframe with values calculated from a pre-existing column
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2 Answers
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Java how to replace 2 or more spaces with single space in string and delete leading and trailing spa
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29 Answers
29
Active
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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...