# Questions tagged [data-visualization]

Plotting data graphically, static or interactive.

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### Remove points in a straight line

I wrote this code to remove points that create a straight line when plotted. For instance, this has many points in a straight line: ...
915 views

### Sorting algorithm visualizer in C++ and SDL2

I finished a sorting algorithm visualizer (for now only uses bubble sort) and this is the code. I'd like some suggestions to improve the memory usage or time elapsed. Built with Cmake and Ninja on ...
759 views

### Analyze frequency and content of political fundraising E-mails

Since I'm a big politics nerd, I wanted to write a little script that would analyze the frequency and content of political fundraising emails. I signed up for the e-mails of 6 campaigns, donated a ...
1k views

### Plotting polynomials roots

NOTE: See follow up to this question here I created a simple python script to plot quadratic, cubic and quartic polynomials with integer coefficients between -4 and 4. It uses numpy to find the roots ...
940 views

### Speech Recognition Part 1: Generate Training Data

You've all heard of neural nets, no? One of the "hello world"s of neural nets is OCR with the MNIST dataset. My idea for speech recognition is to train the neural net with short labeled spectrograms ...
927 views

388 views

### Plotting polynomial roots with density

Follow up on Plotting polynomial roots I rewrote the program to C++ and am now using GNU GSL scientific library and gnuplot and also used OpenMP for multithreading. The result is that it takes about ...
107 views

### Python genetic sequence visualizer

I'm a beginner at python, and this is my first major project. Inspired by this reddit post, I wrote a program that accepts a DNA sequence (in a FASTA file format) and generates a graphical ...
306 views

### Displaying programming languages on a timeline

I did the following two exercises in Programming: Principles and Practice Using C++ (2nd Edition), by Stroustrup, which build upon each other: From Chapter 22 (Ideals and History), Write a ...
166 views

### Generating image gauges from a value, min and max

One of the things I was recently investigating was the ability to generate "gauge" charts—that is, a chart which shows where a value stands within a range of values. As an example, if we know ...
5k views

### Reading and processing histograms stored in ROOT files

The Context My daily workflow largely consists of producing, styling, and circulating plots from a dataset to my advisor and collaborators. We use the C++ framework ROOT to generate and store ...
163 views

### Chart of Percentage questions Answered

Every day, Duga reports the number of unanswered questions and percentage of answered questions (after she calls the API endpoint /info) in The 2nd Monitor (so we ...
5k views

### Showing two d3.js charts on the same page

I created two graphs in d3js: a bar chart and a donut chart. These two graphs use the same json object for data and share an input range and the radio button. This is the code: ...
4k views

### Generating a histogram efficiently from the datasets in a Map

I have a map in which I store total bytes as the key and count of users as the value: ...
192 views

### Turn logged data into fancy plot

I'm logging data from an embedded platform over UART. This gets saved to a log file and I want to process the saved log with Excel. I have no idea whether what I did was even remotely a good solution....
1k views

### 2D lattice random walk plots in functional style

To practice writing code in the functional programming style, I wrote a program to plot two-dimensional lattice random walks. I'd appreciate any feedback about how to improve its "functionaliness". <...
280 views

Configs.java ...
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### Saving temporary file for plotting audio waveform

I am developing a web application in Flask - Python. My goal is to let the user upload an mp3/wav file. This file will (for the scope of this question) get processed by the server and a picture ...
691 views

### Qt Custom Scatterplot

I have created a custom scatterplot in Qt and am wondering if there is a more efficient way to do it. Here is a sketch of the problem: The layout of the plotting area consists of a rectangular ...
96 views

### Git Insert Delete Graph

I attempted to recreate the github code frequency graph(example) with a daily granularity using perl and git log. How did I do, ...
149 views

### Multithreaded HD Image Processing + Logistic reg. Classifier + Visualization

[I'm awaiting suggestions for improvement/optimization/more speed/general feedback ...] This code takes a label and a folder path of subfolders as input that have certain labels ex: trees, cats with ...
1k views

### An ASCII histogram of a die rolled n times

A die is rolled n times. Each time, a random value has been inserted into a vector. This vector then is used to generate a sorted map (wrongly called hashmap in the code) that is later used to create ...
159 views

### Genetic Sequence Visualizer - Generating large images

Inspired by this reddit post, I have written a program that accepts a DNA sequence (in a FASTA file format) and generates a graphical representation. HIV virus and Ebola virus My program works like ...
163 views

### Prompting the user for plot parameters

Below is the current working code for an ongoing project. I am wondering if there is anything I can do to improve the code snippet below. My main concerns lie to two area. First being that I append ...
6k views

### Optimizing for data import in Neo4j using py2neo

Here is my code for importing from a .csv to a neo4j graph using py2neo and cypher statements. I've noticed that it slows down significantly the bigger the graph gets. It takes several seconds just to ...
57 views

### Data Explorer query that makes bar graphs

I wrote a query for SEDE that I think is pretty cool. It uses the currently available graphing capabilities (scatter plots) to create a bar graph. I have used it as the subject for a self-answer on ...
123 views

### Plotting level and temperature data from many Excel sheets

I've been working on a code that reads in all the sheets of an Excel workbook, where the first two columns in each sheet are "Date" and "Time", and the next two columns are either "Level" and "...
199 views

### Mandelbrot rendering code in R

I'm trying out a new continuous histogram coloring method for Mandelbrot rendering in R, and since it requires three loops (three passes), each of them doubly nested, there should be a way to ...
3k views

### Bean Machine Simulation

I could not find a solution from my book's website (student-level access) but I feel that I am missing something that I'm supposed to learn from this exercise. Instructions: Balls are dropped from ...
127 views

### Graphing refugee movements using plotly in Python

I've created a simple data visualization in python that shows the movement of refugees around the world. The code works but I feel it is a bit slow. it takes about 10 s (on my hardware at least) to ...
344 views

I've created a dynamic radar chart which allows manipulation of points by clicking. My code works, but I'm sure the large amount of if.. ...
131 views

### Tracking Containers in a Train Station

This is a time line for control over the events of some containers in a train station. It gets all the data to build the time line by getting a JSON from a database via REST service. The app resets ...
10k views

### Vertical Histogram

I've been been working on a vertical histogram that prints an asterisk in place of a number in a certain range (say 1-10... and so on). My code is working as required. Is there a better, simpler or ...
3k views

### Plotting an input curve and its FFT using gnuplot in C++

I'm currently working on a project1 which will result in millions of FFTs being solved time and time again. I have a finished prototype in Python (using numpy, scipy, and the pyfftw3 package), but ...
2k views

### Genetic algorithm in Python that plots its evolution

After programming in Haskell for a while, I've gotten attached to a functional style. This is clearly evident in the code for my genetic algorithm. Could you provide me with some hints as to how I ...
801 views

### Print the length of words as input to a histogram with horizontal bars

It works, but I'm sure there's a lot of improvement I could make here. I didn't try to get it to work for words over 10 characters in length, and I also didn't want to use built in properties like <...
125 views

### Sorting algorithm visualizer in C++ and SDL2 Improved

Original post: Sorting algorithm visualizer in C++ and SDL2 I followed the advice you gave me and improved my code. I also added two more sorting algorithms. I'm mainly looking for code readability ...
101 views

### Drawing a regression line with a timeseries

My code is using seaborn to draw a regression line with a timeseries data as the x axis, and whatever you want the y-axis to be. Since seaborn does not support this function directly, a dummy column ...
228 views

### Parsing and plotting complex numbers

I am trying to write a Haskell application that parses a bunch of complex numbers from a Mathematica output and then produces a PPM image. The end product looks like this: The code to create this is ...
2k views

### Plotting a GPS track

I have performed this test and they have not given me a conclusive answer (they really have not given me any response). I have to paint a graphic, do you think the implementation is correct? Is there ...
110 views

### CSS & JS piechart

I made a pieChart function thanks to the main CSS properties rotate:xdeg, border-radius:100% ...
445 views

### Generating all unlabeled trees with up to n nodes

I want to visualize all unlabeled trees with $n$ or fewer nodes, not just count them. First idea/attempt: Take a list of all $n-1$ node trees, then append a new leaf to every tree in every way to ...
262 views

### Data analytics on static file of 50,000+ tweets

I'm trying to optimize the main loop portion of this code, as well as learn any "best practices" insights I can for all of the code. This script currently reads in one large file full of tweets (50MB ...
94 views

### Simple plotting abstract base class and example subclass

I came across a CocoaControl ZFPlot and wanted to extend here. I ended up writing a base class (ZFPlot shown below) as well as several extensions (ZFLine, ZFScatter, ZFBar, none shown here for brevity)...
4k views

### Plotting a vector field in R + ggplot

I've written a small program that draws a vector field in R using ggplot for a given differential equation. There is a topic on the subject here however, the proposed solutions either don't provide ...
1k views

### Tkinter GUI for running HPLC pumps, real-time data visualization

What I made I used Tkinter to write a GUI to run some HPLC pumps for my work. The application sends some messages to the pumps via serial connections, reads a response, then logs data to a csv file. ...
80 views

### Fetch, plot, and send security incident statistics with Excel

TLDR: I don't develop for a living. If someone could point me in the right direction to make my script more readable/pythonic I would appreciate the assistance. In particular I'm struggling with the ...
554 views

### Draw a spark line with SwiftUI

I am using a set of data points (currently randomly generated), and drawing a line graph inside a box: ...