All Questions
179 questions
2
votes
3
answers
640
views
Bifurcating recursive calculation with redundant calculations
def T(n):
if n <= 0:
return 1
else:
return T(n-1) + (n-1) * T(n-2)
print T(4)
I need an effective way to print out the output of the function <...
- 2,599
12
votes
3
answers
2k
views
Finding the prime factors of a number in Python 2
I’ve created a function that takes a number and, if it’s prime, tells you so, or if it’s composite, gives you the prime factors of the number (and if it’s 1, tells you that it’s neither).
...
- 223
0
votes
1
answer
545
views
Image color-moment extractor [closed]
I was just wondering if there is a way to speed up the performances of this for loops in Python.
I'm trying to process an image to get the color-moments without using libraries.
It takes about 12sec ...
- 11
3
votes
1
answer
302
views
Estimation of min_samples for DBSCAN
I'm attempting to speed up some python code that is supposed to automatically pick the minimum samples argument in DBSCAN. Currently the execution time grows exponentially as the number of training ...
- 165
4
votes
1
answer
342
views
Store special deals, like 3 for 2
I have to apply two deals on the cart.
Buy 3 (equal) items and pay for 2
Buy 3 (in a set of items) and the cheapest is free
Items in cart:
...
- 870
1
vote
1
answer
210
views
Reading employee data from a PostgreSQL database
I have developed this script to read employee_language table records of a PostgreSQL database using Python 2 (due to some OS limitation). I want to find duplicate ...
- 433
1
vote
1
answer
249
views
Django view of reward points that heavily filters and sorts (many) database results
My page (even when it has no data) takes 10+ seconds to load. That's just too long, considering when you finally get to it there's no data. When it has data, it takes even longer.
Here is my view, ...
- 163
2
votes
0
answers
133
views
Extract cell values from multiband rasters
I have the following function and code snippet to extract cell values for multiple years, format it, and save to a list. Each raster has 365 bands — one for each day. A separate operation is performed ...
- 121
5
votes
1
answer
1k
views
Improving the speed of creation for three Perlin Noise Maps in Python?
I am interested in learning how I can improve the speed of the code in this pygame file. I iterate over 6400 * 1800 * 3 or 34,560,000 elements of various numpy arrays here to apply noise values to ...
- 421
7
votes
1
answer
1k
views
Plotting terrain pixels with PyGame based on random NumPy array
I am experimenting with Perlin Noise and random map generation. I have a 2D numpy ndarray full of 16-bit floats called map_list that I call from the singleton ...
- 421
2
votes
1
answer
105
views
Application to monitor device power levels for deviations
I have a high performance, computation intensive application that runs on a Centos 7 machine with Python 2.7.5.
I'll try to explain what the application does:
The application runs an infinite loop, ...
- 181
1
vote
1
answer
114
views
Python Firewall-Connection-Event Filter too slow
I've written a little piece of code to filter Firewall-Connection-Events by a certain group of IPs. But the code can't keep up since the input is fairly huge. I am looking for ways to make this code ...
- 13
3
votes
1
answer
413
views
Fully Constrained Least Squares (FCLS) Linear Spectral Mixture Analysis Method
I have written code using Python for Fully Constrained Least Squares (FCLS) Linear Spectral Mixture Analysis which could be applied for unmixing multispectral image successfully.
However, the ...
2
votes
1
answer
68
views
Looping text in Python with directional control
The code is an implementation of looping text (similar to a circular buffer - wraps around when it reaches the edge of the defined bounds) with directional control.
The code is functional and works ...
user180837
-1
votes
1
answer
256
views
Decoding a string encoded by Caesar Cipher and some delimiters [closed]
I have the following code which I seek to optimize. The result of the bruteforce I already have but I'm just trying to learn some more python using the same example.
The code in the data needs to be ...
- 9