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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...
What are “connecting characters” in Java identifiers?
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270
Here is a list of connecting characters. These are characters used to connect words.
http://w...
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 do you calculate log base 2 in Java for integers?
I use the following function to calculate log base 2 for integers:
10 Answers
10
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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...
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...
SQL RANK() versus ROW_NUMBER()
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229
ROW_NUMBER : Returns a unique number for each row starting with 1. For rows that have duplicat...
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...
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 ...