All Questions
Tagged with python-2.xnumpy
32 questions
2votes
0answers
148views
Find the available squares for rooks in empty board using boolean arrays
I will describe two techniques, then the question will be how I can make an algorithm that is more efficient, if possible. I want to find an efficient way to determine the squares where the pieces on ...
- 143
0votes
1answer
540views
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 ...
2votes
0answers
123views
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
5votes
1answer
1kviews
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 ...
7votes
1answer
1kviews
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 ...
2votes
3answers
443views
Code to find the sum of the product of all size-n combinations of an array
The title is a bit of a mouthful, so here's a quick example: You've got an array, maybe just the digits 1-3, and you want to get the sum of product of all size-2 combinations of the array. Those ...
- 33
6votes
2answers
3kviews
Remove outliers from a point cloud
This function accepts a cloud of points, and returns those points that are within delta distance of the average (mean) position. ...
3votes
2answers
4kviews
Calculate True Positive, False Positive, True Negative and False negative and colourize output
Objective : Calculate True Positive, False Positive, True Negative and False negative and colourize the image accordignly, based on ground-truth and prediction from my classifier model. Problem : ...
user108668
5votes
1answer
214views
Using NumPy to scale data in 2 out of 3 columns
The below code takes a csv containing age, weight, height and prints the betas determined through linear regression to an output csv. It runs for 10 iterations using a different alpha for each, and ...
- 125
5votes
1answer
5kviews
Applying Laplacian smoothing to vertices in a mesh
I'm totally new in Python and I wrote some code. It is a simple algorithm to smooth objects. I need to find adjacent vertices in mesh and sum their coordinates and after that divide by a number of ...
- 51
3votes
0answers
1kviews
Implementing the stochastic gradient descent algorithm of the softmax regression with only NumPy [closed]
I am implementing the stochastic gradient descent algorithm. I think there is plenty of room for improvement. ...
- 345
5votes
2answers
1kviews
A command-line utility to solve a system of linear equations
I was re-checking my answers for a Math paper on my laptop. I needed to verify my solution for a system of linear equations. Unfortunately, I found no quick way to do that. That's why I wrote a (...
- 3,027
5votes
2answers
850views
Python Cartesian Product in a constrained dictonary
I want to calculate the Cartesian product of n copies of a small list, marker=[0,1,2]. I want to use these Cartesian product ...
- 245
4votes
1answer
336views
Surface Density Profile
I am trying to compute the surface density profile, given the spherical density profile in 3D for different parameters in order to interpolate and have it as a function of them to use later on for ...
- 53
2votes
1answer
183views
Slicing a big NumPy array
I have a function that takes a four-dimensional NumPy array M and, for each value i of its second index, takes all of M without the i-th "column", evaluates the product over all other columns, and ...
- 123
