Questions tagged [julia]

Julia is a high-level dynamic programming language designed to address the requirements of high-performance numerical and scientific computing while also being effective for general purpose programming.

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0answers
27 views

Sampling and Reconstructing a signal in Julia

I am a newcomer to the Julia world, so I started trying to implement a very simple program: Sample a signal Reconstruct it (various ways, just rectangular for now) Plot it Everything is fine and '...
6
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0answers
67 views

How to speed up simple linear algebra optimization probelm in Julia?

I implemented the LSDD changepoint detection method decribed in [1] in Julia, to see if I could make it faster than the existing python implementation [2], which is based on a grid search that looks ...
6
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1answer
90 views

Optimizing my 2D Ising model code in Julia

I'm just starting to learn Julia, I work primarily in physics and am used to writing most of my code in Fortran90 and occasionally Python for Tensorflow (also Mathematica but that's less relevant). ...
2
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1answer
33 views

Add optional distance range to function

I have a simple brute-force search function: ...
2
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1answer
145 views

Time-series search with early stopping

I want to search for a pattern in a time-series while either ignoring the mean/shift/bias or the scale/standard deviation. Consequently, I've written two functions. The first function searches ...
1
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1answer
34 views

Experience replay memory

I have just begun learning Julia. Here is an implementation of experience replay memory for use in a reinforcement learning algorithm. It is pretty simple, essentially a ring buffer with the following ...
0
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1answer
70 views

Building an equation [closed]

I've developed a function in the Julia language, using the SymEngine library, which builds an equation. This function works quite quickly, returning a lambdified ...
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0answers
159 views

WebSocket based API library in Julia

I made a very bare-bones API "library" in Julia which should abstract the interaction with the API. The API is fairly complex - it's based around 2 core layers an HTTPS/REST API for general ...
3
votes
1answer
55 views

Bernstein polynomial type for quadratic clipping

I would like to implement a Bernstein polynomial class in Julia for learning purposes. The goal in the end is to implement the quadratic clipping algorithm from this paper. I am completely new to ...
2
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2answers
131 views

For names sake - Project Euler 22

Project Euler - 22 Names scores Using names.txt (right click and 'Save Link/Target As...'), a 46K text file containing over five-thousand first names, begin ...
3
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0answers
228 views

Weighted logistic regression in Julia

I'm trying to estimate a weighted logistic regression as part of a bigger project. I have an implementation in Matlab2015b, but I wanted to give Julia a try to see if I could speed up the estimation ...
3
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0answers
524 views

Parsing simple log files in Julia vs Python

I wrote a log parser in Python and Julia. The Python version takes about 8 seconds to process 350 files, while the Julia version takes about 8 seconds to compile, after which it takes over 20 seconds ...
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0answers
108 views

Idiomatic string from/to integer conversions in Julia (Project Euler #33)

I am starting to learn Julia. For getting fluent in the syntax, I am solving some of the easier Project Euler challenges. Problem 33 is about so-called curious fractions, which keep their value after ...
3
votes
1answer
62 views

Saving the values of all variabled declared in a block

Often when running exprimental code to empirically investigate an algorithm, you tweak a parameter, then rerun the code, and generate a bunch of saved models for various parameters. To make sure I ...
21
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5answers
1k views

Benchmarks of various scientific programming languages for theoretical modelling

For a theoretical modelling course for biology students, I am trying to decide which would be the best technical programming language for doing evolutionary simulations in terms of elegance and ...
4
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1answer
784 views

Speeding up OpenCL matrix-vector multiplication

So I'd like to get a performance boost above and beyond standard Julia matrix-vector multiply, using my Intel HD Graphics 4000 1536 MB GPU, but I can't do better than an order of magnitude worse ...
2
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1answer
157 views

Recursively walk directories with a callback function

This code works, but I want to refine it: ...
1
vote
0answers
73 views

Using RemoteChannels for an parallel iterable map

RemoteChannels hit with julia v0.5 There are no examples online, but I managed to get them to work. They are still very new, and all this whole area of multithreading code continues to have running ...
4
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1answer
535 views

Sort Algorithms in Julia

Similar to this question here, I am trying to implement sort algorithms in Julia, as part of a package. The code for the implementation is as follows: ...
3
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2answers
512 views

Search algorithms in julia

I've been trying to implement the basic search algorithms: Sequential search for ordered and unordered arrays and the binary search algorithms, as part of a package. So, this is the implementation: <...
4
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2answers
150 views

Computing the double Integral using MonteCarlo techniques using Julia

I decided to try and learn Julia for doing scientific computing, and I decided to tackle the problem of finding $$ \int_{D_{\frac{1}{4}}} x^4 + y^2 dA $$ where \$ D_{\frac{1}{4}} \$ is the part of ...
5
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1answer
118 views

Implementing cat function in Julia

I wanted to implement the cat function in Julia and I ran a few test cases but I am not sure if I am missing anything: ...
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0answers
441 views

Flattening lists of Vectors and Matrices into arrays

For many optimisation methods the parameters must be given as a single vector, such as Optim.jl. But for many interesting functions the parameters/coeffients to be optimised are matrices, or a mixture ...
4
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2answers
159 views

Latent Dirichlet Allocation Posterior Inference

I have implemented Latent Dirichlet Allocation in Julia. Since the code is rather long, I copied the essential part here but the complete code can be found on GitHub. ...
5
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0answers
128 views

Kernel density regression in Julia

Here is a naive implementation of a kernel density regression algorithm in Julia. The code works, but there is quite a bit of room for improvement though. First, there is not an optimal bandwidth ...
2
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0answers
31 views

Iterative procedure to get 3D coordinates from distance constraints

Imagine you have a series of n points randomly generated in a box in 3D space. You also have a list of distance bounds, e.g. points 5 and 3 should be between 1.0 and 2.0 Angstroms apart. There are ...
5
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1answer
376 views

Terry Feagin's 10th order explicit Runge-Kutta method

The following Julia code implements Terry Feagin's 10th order explicit Runge-Kutta method (a more accurate cousin of RK4). Though the structure of the code is quite simple (i.e. no cyclomatic ...
2
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1answer
686 views

Functions for outputting the rows and columns of a matrix

I often want to iterate either row-wise or column-wise though a matrix in Julia, so I've created a pair of functions to help: ...
8
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1answer
211 views

Individuals reproduce and mutate

How can I improve the performance (in terms of computation time) of this code? ...
6
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2answers
485 views

Julia RPN calculator algorithm ported from Python version

I've just finished the Reverse Polish Notation task in Julia from rosettacode.com by porting the existing Python code. There are only a few lines I don't get how to port: ...
3
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1answer
320 views

Neural Network in Julia

I am currently trying to implement a Neural Net in Julia with the goal of eventually implementing a stacked autoencoder. My code seems to work but I would appreciate any constructive criticism. If ...
2
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1answer
220 views

Speed optimization for girth-counting algorithm

I have the following girth-counting algorithm on a large 0-1 matrix and I need to optimize it for speed: ...
11
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2answers
1k views

Neural Network appears to be slow

I have some neural network Julia code which I'm hoping to speed up. It's possibly simply poorly-designed, but I'm not convinced. ...