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Why are floating point numbers inaccurate?
...gnificand). A very simple number, say 9.2, is actually this fraction:
5179139571476070 * 2 -49
Where the exponent is -49 and the mantissa is 5179139571476070. The reason it is impossible to represent some decimal numbers this way is that both the exponent and the mantissa must be integers. In ...
Why do we need tuples in Python (or any immutable data type)?
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immutable objects can allow substantial optimization; this is presumably why strings are also...
counting number of directories in a specific directory
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15 Answers
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Numpy argsort - what is it doing?
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146
According to the documentation
Returns the indices that would sort an array.
2 is the i...
How to add an empty column to a dataframe?
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11 Answers
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Math.random() explanation
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165
int randomWithRange(int min, int max)
{
int range = (max - min) + 1;
return (int)(M...
How to use glOrtho() in OpenGL?
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151
Have a look at this picture: Graphical Projections
The glOrtho command produces an "Oblique"...
How to iterate through two lists in parallel?
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1437
Python 3
for f, b in zip(foo, bar):
print(f, b)
zip stops when the shorter of foo or b...
Efficient way to rotate a list in python
... dedicated rotate() method.
from collections import deque
items = deque([1, 2])
items.append(3) # deque == [1, 2, 3]
items.rotate(1) # The deque is now: [3, 1, 2]
items.rotate(-1) # Returns deque to original state: [1, 2, 3]
item = items.popleft() # deque == [2, 3]
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