All Questions
27
questions
3
votes
2
answers
95
views
4
votes
2
answers
4k
views
Cython with variable-length arrays
Dynamically growing arrays are a type of array. They are very useful when you don't know the exact size of the array at design time. First you need to define an initial number of elements. (Wikipedia)
...
- 149
8
votes
1
answer
125
views
Using get_dummies to create a Simple Recommender System - Cold Start
Question: was using get_dummies a good choice for converting categorical strings?
I used get_dummies to convert categorical ...
- 181
2
votes
1
answer
87
views
Forecasting stock market data using Support Vector Regression
I coded this Support Vector Regression (SVR) myself following some equations in a journal (see here, or here (not in English)). The loss function used by the journal and the code below is mean ...
- 23
4
votes
0
answers
72
views
Importer for binary datafile of PI88 Nanoindenter
As an exercise, I want to rewrite a C++ program to import measurement files (and later create excelsheets, reports ...). The measurement files split in 2 files, a binary file, and a xml-file. Because ...
- 288
5
votes
1
answer
596
views
Beginning of a GUI Python solution to Andrew Ng's ML week 3 excercises
Coursera has a course for beginning Machine Learning and the code is written in Octave. This is the beginning of a solution to the week 3 exercises but written in python. Instead of a terminal app I'...
- 53
1
vote
1
answer
179
views
k-armed bandit problem in Python
I implemented k-armed bandit problem in C#, MATLAB and Python. C# and Matlab code run fairly fast (With same settings of T = 2000 and nRun = 1000 the elapsed time is about 6sec). However, the Python ...
- 159
16
votes
1
answer
388
views
Solve the phase state between two haplotype blocks using markov transition probabilities
I have spent about more than a year in python, but I come from biology background. I should say I have got some understanding of for-loop and nested-for-loop to workout the solution to the problem I ...
- 235
5
votes
1
answer
206
views
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
5
votes
1
answer
4k
views
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
3
votes
0
answers
275
views
Simple finite difference employing Maccormack technique
I am relatively new to programming and while I am fairly comfortable with the math, I cannot say with confidence that I feel the same way with programming. Anyway here is a simple finite difference ...
- 31
4
votes
2
answers
320
views
Randomly generate a list with predetermined mean
Aim: randomly generate \$n\$ numbers between \$a\$ and \$b\$ with (roughly) mean \$m\$.
Problem: The simple beginner's code I wrote becomes very inefficient as \$m\$ moves away from \$\frac{a + b}{2}\...
- 143
12
votes
3
answers
602
views
Plotting different parameterized polynoms
For a university assignment I had to plot different polynomial functions depending on one single parameter. That parameter gave the number of supporting points to interpolate a given function in the ...
- 25.2k
5
votes
1
answer
194
views
Calculating a table of deBroglie wavelengths for various electron energies
Here is the formula for the deBroglie wavelength of an electron versus its kinetic energy:
$$ \lambda(E_k) = h\left/\sqrt{\frac{(E_k+m_eC^2)^2-m_e^2C^4}{C^2}}\right.$$
and here is simple script that ...
6
votes
1
answer
1k
views
Python! (Snake)
This is now an Iterative Review.
Next Iteration
Nowhere near a full game yet. Just a basic overview and initialisation of a Snake() class.
Thoughts?
...
- 8,790
7
votes
1
answer
2k
views
Koch snowflake in Python with numpy and pygame
I've drawn a Koch snowflake with Python 3. I'm new to the Python world and would appreciate all feedback on how to make the code more Pythonic as I'm not used to these idioms, styles and modules. All ...
- 275
6
votes
2
answers
270
views
Picking seats in a matrix
I'm trying to write a Python class that creates a matrix of zeros, then uses a random number generator to pick 'seats' on the matrix. It changes the zero in that seat to a one, until the matrix is all ...
- 61
2
votes
2
answers
5k
views
Simulation of 2D elastic balls
Following this SO post and this Wikipedia article, I wrote a Python script to simulate physics of 2D elastic balls.
I define the physical behaviour of each ball in the ...
- 329
5
votes
1
answer
252
views
Comparing FFTs to deduplicate IVR recordings
I've got a Python script that traverses two file trees, checking all .wav files for duplication.
I'm still an undergrad, and have never worked with audio before. I'm not entirely sure this is going ...
- 153
12
votes
2
answers
17k
views
Generating a 3D Point Cloud
I'm trying to produce a 3D point cloud from a depth image and some camera intrinsics. The image is 640x480, and is a NumPy array of bytes. The output is a (rows * columns) x 3 array of points.
I've ...
- 121
4
votes
1
answer
146
views
Look up parameters based on a numpy array of input values
Aim: Write a function that looks up empirical parameters A, B and C for a solar radiation ...
- 143
4
votes
1
answer
53
views
Printer Color Templates
I'm new to Python and I just wrote my first program with OOP. The program works just fine and gives me what I want. Is the code clear? Can you review the style or anything else?
...
- 43
5
votes
1
answer
5k
views
Fixed point iteration and cobweb plot
I'm using Python to find fixed points of a given function and then draw a cobweb plot to visualize it. Thanks to this question, I have the core of the code written and can accomplish the task, but I ...
- 53
7
votes
2
answers
299
views
Taking wind data and simulating future wind profiles
I am new to programming, and am using Python to take wind data and simulate future wind profiles. The code as written takes a while to execute and I was hoping someone could suggest ways to make my ...
- 71
8
votes
2
answers
30k
views
K-means clustering in Python
The following code uses scikit-learn to carry out K-means clustering where \$K = 4\$, on an example related to wine marketing from the book DataSmart. That book uses excel but I wanted to learn Python ...
- 225
1
vote
1
answer
3k
views
Parse Bloomberg Excel/CSV with Pandas DataFrame
I retrieved Bloomberg data using the Excel API. In the typical fashion, the first row contains tickers in every fourth column, and the second row has the labels Date, PX_LAST, [Empty Column], Date, ...
- 11
2
votes
1
answer
915
views
Performance problems with 1D cellular automata experiment in Python with Numpy
I'm an experienced programmer but relatively new to Python (a month or so) so it's quite likely that I've made some gauche errors. I very much appreciate your time spent taking a look at my code.
My ...
- 123