All Questions
Tagged with python-3.x numpy
179 questions
2
votes
2
answers
234
views
Infinite 2d block world (2d minecraft) with chunk system, physics and slower loading
Follow up from this question. I have added a slower loading system that allows the main game to run faster but I still get under 30 fps with caves even if I allow the player to outrun the loading. I ...
- 121
3
votes
5
answers
2k
views
How do I speed up this simulation program
This is a program to solve a differential equation numerically using Euler method. As of now, it is very slow, and I need to run 10000 Monte Carlo simulations.
The differential equation is called ...
- 161
2
votes
1
answer
90
views
"Flattening" a 2D STM image by subtracting an Nth order polynomial without typing out all the terms for each N?
I have some scanning tunneling microscopy (STM) topography images that I need to flatten. I have found that for some data I need a 4th order polynomial, but in other cases a lower order works better.
...
- 473
5
votes
2
answers
523
views
3
votes
1
answer
99
views
3ph 2l inverter simulation with SPWM
Here is a code for a simple model of three phase two level inverter with constant DC voltage source and three phase RL load.
...
- 51
4
votes
2
answers
173
views
NumPy script to convert BGR to HSL and back
This is a NumPy script that converts BGR arrays to HSL arrays and back, without using OpenCV. Input and output values are arrays of 3 dimensions with values ranging from 0 to 1, the shape of the ...
- 3,186
3
votes
3
answers
137
views
Calculate length of continuous gaps
I have a list with some nan values, out of which some are continuous, e.g.:
list = [1, 2, 3, np.nan, np.nan, 6, 7, np.nan, 9, np.nan,np.nan,np.nan, 12]
For some ...
3
votes
0
answers
146
views
Image generator using prime numbers in polar coordinates
Related
This is a Python script that generates images using prime numbers up to a given positive integer, it generates prime numbers using the Sieve of Eratosthenes with some rudimentary Wheel ...
- 3,186
2
votes
0
answers
90
views
Python script that generates images using Thue-Morse sequence
In mathematics, the Thue–Morse sequence, or Prouhet–Thue–Morse sequence, is the binary sequence (an infinite sequence of 0s and 1s) obtained by starting with 0 and successively appending the Boolean ...
- 3,186
3
votes
1
answer
162
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Solve an option pricing PDE in Python - Part 1 [closed]
The Github repository NM-Heston solves call option prices under the Heston 2-factor model using ADI splitting schemes. I am adapting the code to price options under the 3-factor Heston-Hull-White ...
- 101
1
vote
1
answer
140
views
Further optimizing the ISING model
I've implemented the 2D ISING model in Python, using NumPy and Numba's JIT:
...
2
votes
1
answer
97
views
Optimize python computation of transition matrix
I have an array of integers labels, for instance array([0, 1, 1, 2, 2, 2, 3, 3, 1, 4, 4, 1, 1, 0, 0, -1, -1]). The array can be ...
- 231
9
votes
1
answer
4k
views
3
votes
1
answer
127
views
Create a forecast matrix from time series samples
I would like to create a matrix of delay from a time series.
For example, given
y = [y_0, y_1, y_2, ..., y_N] and W = 5
I need to create this matrix:
...
- 133
1
vote
0
answers
46
views
BoundingBox dataclass implementation with cupy, cudf, and nvector
The dataset I'm working with is rather large so I've been experimenting with cudf and cupy. Here you can find instructions for ...
- 638
3
votes
1
answer
51
views
Simulate a population of agents and compute averaged cumulative efficiency
I have the following code which is a model where each agent makes decisions and accumulates efficiency over time.
With the def scenario function, the idea is to ...
- 163
2
votes
0
answers
226
views
Do Mann-Kendall and Pettitt tests on each CSV file
Here is a function that will take each text file in a directory, do the Mann-Kendall and Pettitt tests, and then write the output to a text file. Would you please suggest me improve the code to make ...
- 21
1
vote
0
answers
306
views
A collection of Python functions that fill a given region with rectangles
These are what I was working on in the last few days, I wrote a bunch of functions that fill a given region with rectangles of different colors.
The functions can:
Randomly split a region into sub ...
- 3,186
2
votes
1
answer
994
views
Python function that shears image by n degrees while keeping the relationship between height and width
I am trying to find a method to shear/skew an image horizontally or vertically by n degrees (n ranges from -90 to 90 excluding the terminals) so that the result would meet the following conditions:
...
- 3,186
0
votes
0
answers
102
views
Python 3 OpenCV script that scans a giant picture to make a video
This is a Python script that I wrote completely by myself. Basically it scans a giant picture to make a video.
They say one picture is worth more than a thousand words. Since a video contains ...
- 3,186
0
votes
1
answer
70
views
Stacking Z axis on multiple [1440x720] DataFrames (X, Y)
Each datum represents a point in a 1440x720 image of the globe, The values are 0-9. Each new layer is of a higher elevation. I need to structure a DataFrame in a ...
- 638
6
votes
1
answer
2k
views
Python 3 script to make photo collages
I have written a Python script that takes a list of filenames of pictures and generates a photo collage of them. This is my most complex project yet, and I have written it completely by myself (like I ...
- 3,186
2
votes
1
answer
75
views
dataframe mean outliers to NaN to derive a higher quality mean for area,speed,azimuth
I have some data that represents the area, speed(meters per second), and azimuth(rads) of a polygon. The objective is to determine the mean for each set of parameters. With that mean value, apply a ...
- 638
1
vote
1
answer
68
views
numpy mean azimuth with functools.reduce
From the left to the right column calculating the mean azimuth, and using that mean value to calculate the subsequent columns mean value
data (azimuth radians)
...
- 638
3
votes
1
answer
228
views
pandas dataframe of temps and numpy.linalg.lstsq
The problem is this. Forecast model data indicates at 0700Z the 1000 milibar temps will be -4C°. The forecaster knows that is incorrect, so they choose to make a correction. This correction should ...
- 638
3
votes
1
answer
683
views
Vincenty's distance Direct formulae numpy
I've refactored a function from the pygc library used to generate the great_circle. The Vincenty's equation below can be found ...
- 638
4
votes
1
answer
125
views
pandas conditions across rows and columns
Is there a better way to accomplish this? The function determines the Category for each row based on some conditions. Another set of conditions determines the <...
- 638
1
vote
0
answers
49
views
Pandas Numpy Nvector to generate a storm track algorithm
I made previous post here, relating to this topic.
The class uses now uses some additional 3rd party libs nvector & pygc.
...
- 638
1
vote
1
answer
126
views
Multiple GeoJSON Feature Collections to a Pandas MultiIndex DataFrame
Edit: The end objective is to monitor the movement of severe weather, determine its vector and make a prediction.
I'm working with a GeoJSON ...
- 638
1
vote
1
answer
1k
views
Calculate a time weighted average of a feature
I'm trying to calculate a time weighted average of a feature (feat) based on previous rows by date for a given ...
- 153
1
vote
1
answer
747
views
Calculating all combinations from arrays AND (arrays OR floats)
Context: My question comes from needing to iterate different np.arange arrays. The main motivation is to calculate all the possible combinations between the arrays, ...
- 163
4
votes
1
answer
685
views
Function to calculate the GC content variation in a sequence
I came across this BMC Genomics paper:
Analysis of intra-genomic GC content homogeneity within prokaryotes
And I implemented some Python functions to make this available as part of a personal project.
...
3
votes
1
answer
746
views
Implementing histogram in python
I was trying to implement my own version of matplotlib's hist function and I came up with this:
...
2
votes
1
answer
135
views
Using arrays more effectively with numpy
I previously posted some code I've been working on and had a fantastic answer, but as I didn't post the full code I was then unable to bring it all together using the much faster numpy implementation, ...
- 75
2
votes
1
answer
185
views
Calculating a function over a large array
I have written some code to determine an interpolation matrix over a grid of points. I originally wrote the code in matlab, where under the specified parameters it took just over 2 minutes. The ...
- 75
0
votes
1
answer
2k
views
line-circle intersection [closed]
I have this code that generates a random line and a random circle.
...
- 109
2
votes
2
answers
1k
views
Applying Minimum Image Convention in Python
I am computing pairwise Euclidean distances for 3-D vectors representing particle positions in a periodic system. The minimum image convention is applied for each periodic boundary such that a ...
- 21
8
votes
1
answer
1k
views
Genetic algorithm to guess coefficient of a polynomial
I have tried to code a genetic algorithm to guess the coefficients of a degree 4 polynomial. The information initially provided is values of y = f(x) for different x using the original polynomial. I ...
- 233
4
votes
1
answer
105
views
Dataframe transformation to numpy ndarray takes ages to complete
I would like to transform my dataframe into an array of fixed-sized chunks from each unique segment. Specifically, I would like to transform the ...
- 143
3
votes
1
answer
827
views
Using Numba works slower than not using it for my Python code
I thought this community is better place to ask my question so I ask here rather than at StackOverflow.
Recently, I learned that Numba can make Python function ...
- 41
1
vote
1
answer
71
views
Python utility to clean noise from flat text files
I have created simple code in which it takes flat file (txt) and eliminate the noise and error and only return clean rows, i.e. return flat file with the data I am interested in. it works fine but ...
- 143
2
votes
1
answer
37
views
Reducing running time of creating integration field in flow field algorithm (python)
The integration field needs to get recalculated every time the starting or goal coordinates change. I wanted to use the flow field algorithm for a problem that includes bigger mazes with changing ...
- 31
5
votes
3
answers
265
views
Optimizing an implementation of the RKF method
This is an algorithm regarding the RKF method:
...
3
votes
1
answer
73
views
Generating multiple new arrays using numpy
Say I have the following two different states:
state1 = [0, 1, 0, 1, 1]
state2 = [1, 1, 0, 0, 1]
And I want to generate n number of new states by only changing the ...
- 133
4
votes
1
answer
65
views
Fuzzy clustering index functions
I reimplemented the functions RI.F (Fuzzy Rand index), ARI.F (Fuzzy adjusted Rand index) and JACCARD.F (Fuzzy Jaccard index) of the R package fclust in Python.
However, it seems - even though I use ...
- 191
2
votes
2
answers
111
views
Downloading COVID data and uploading graphs
So this is a project I have been working on for the last few weeks. Just started learning Python. Started out with bash scripting and got the itch to learn more. Anyway code fetches covid-19 data from ...
- 137
5
votes
1
answer
202
views
compare between two labels /objects -dominance rules
I have a function dominates() that seems to be the bottleneck of my algorithm (after profiling it). the function is as follows:
...
- 151
2
votes
1
answer
52
views
Hardware driven data processing and ploting in need of better control flow
This is code for a measurement setup that receives a steady stream of UDP data, finds the trigger in one channel and operates on the data in the other channel to enhance the signal and remove noise, ...
- 243
2
votes
1
answer
68
views
Resource reservation system
I'm using a function to determine if resources can be used again or not.
This is the numpy array I'm using.
...
- 21
3
votes
2
answers
95
views
