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Questions tagged [data-visualization]

Plotting data graphically, static or interactive.

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0answers
13 views

Google ChartWrapper bar formatted table

The end result is a bar formatted table chart that has expanding and minimising rows. The code below works fine but I'd like to know if there is a cleaner way to achieve the same result (see JSFiddle ...
4
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1answer
47 views

Bar graph of Easter date distribution

Computing Easter for a given year is a classic computational problem. It is also one of the few cases when code seems to just have to live with magic numbers. Alternative to magic numbers: Decoding ...
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0answers
21 views

Salary-structure report using a web-presentation

I had to create a report which presents the salary structure of a firm. The data needed was provided by the client as CSV-files. I used PHP for the reading and preprocessing of the data. The actual ...
2
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0answers
26 views

Angular polling and plotting component using Firebase

I could use some help refactoring my component and service. I have a lot of nested logic and wasn't sure what I could do to improve this. I'm new to Angular 7 and their piping syntax. I suspect this ...
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0answers
14 views

Creating Google Charts on SharePoint

I was creating a script to pull data from a SharePoint list and display its contents in graphical form on another page. My original script was very messy and I had asked advice on how I should ...
3
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1answer
32 views

Sample size, P-values (its relationship), and data visualization with plots. ggplot and T test

We know that P-values (within t-test context as an example..) is highly sensitive to sample size. A larger sample will yield a smaller p-value remaining everything else constant. On the other hand, ...
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1answer
53 views

Word count graph

I created a program in python that reads a file and outputs a frequency graph of the words it contains. Any feedback or tips would be appreciated. ...
3
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1answer
64 views

Program which accepts grades and prints grade distribution

I'm doing the MOOC Java course (CTRL+F "distribution"): The input of the program is a set of exam scores of a course. Each score is an integer. When -1 is entered, the program stops asking for ...
2
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1answer
43 views

dc.js and crossfilter app to display multiple charts

Consider the following crossfilter / dc.js app (screenshot): ...
2
votes
1answer
26 views

Create a histogram of the lengths of words

I am reading through K&R C 2nd Edition, and I am on exercise 1-13. The exercise is to write a program to print a histogram of the lengths of words in its input. I wrote a program that successfully ...
5
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1answer
62 views

Code to plot graphs with multiple panels efficiently

I quite often plot graphs looking at how some property or function varies with different parameters. Normally, I find the analysis code can be written fairly succinctly and separated into a suitable ...
3
votes
1answer
74 views

Plots of prior and posterior distributions for a model

I have an exercise that ask to plot the prior and posterior distribution in the Poisson-Gamma model. I did it (I think it's correct) inspired in the answer of this question https://stats.stackexchange....
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1answer
26 views

Console-based table structure - A python implementation

Some of you might remember my previous implementations of this idea in C++. The threads can be found here and here. I tried to implemented the same idea, but this time in python. A summary of the ...
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0answers
29 views

Moderate return-low risk vs high returns-high risk investments

To quantify Buffet's #1 rule of investing, "Don't lose money", I take the assumption that % returns of an investment follow a Normal distribution. Now a high return high risk investment might follow ...
2
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1answer
45 views

dplyr — tidyverse, pipes, correlation, same variable across time “a” “b”

Have a look at this dataset. The"a" and "b" are used to make possible differentiate when the same variable was measured. In this case X1a and X1b access the same variable, but "a" was (suppose..) in ...
1
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1answer
109 views

Using dplyr and pipes for logistic regression plotting

I have successfully created a plot of a binomial glm using example data. https://sciences.ucf.edu/biology/d4lab/wp-content/uploads/sites/125/2018/11/parasites.txt The predictors of the model include ...
6
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1answer
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 ...
3
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0answers
139 views

K&R Exercise 1-13. Printing histogram of word lengths (vertical variant)

I'm going through the K&R book (2nd edition, ANSI C ver.) and want to get the most from it. How does the following solution look to you? Note that, for the sake of exercise, I don't want to use ...
3
votes
2answers
101 views

K&R Exercise 1-13. Printing histogram of word lengths (horizontal variant)

I'm going through the K&R book (2nd edition, ANSI C ver.) and want to get the most from it. How does the following solution look to you? Note that, for the sake of exercise, I don't want to use ...
2
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0answers
31 views

Function that plots data frames, supporting several variants

I defined a function that generates tables and creates countplots and barplots based on the arguments that it receives. But the snippets of code inside the function are repeated several times, which ...
1
vote
1answer
466 views

D3 Updating stacked bar chart

In my data there can be different number of bars in each chart. Here is a picture: When pressing the button labeled change bars layout the view of the charts toggles between horizontal and vertical ...
10
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1answer
203 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 ...
5
votes
1answer
92 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 ...
4
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1answer
41 views

Plot random generated 'n' non-colliding circles using Matplotlib

I have a function which plots n randomly generated non-colliding circles. The circle is a Circle object, part of ...
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0answers
21 views

Normal Distribution and K-means clustering demonstration

I have two classes, the 1st one aims to display the Normal Distribution, and the 2nd one aims to perform K-means clustering. The emphasis is to build classes of the mathematical methods as examples ...
4
votes
1answer
93 views

Haskell K-means implementation

The following is a Haskell backend to a K-means visualisation: I have omitted the API code (exists in a separate module), the relevant endpoints simply call ...
1
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1answer
147 views

Galton Board Simulation

This program is written for Windows 7 under MinGW using gcc. I'm seeking recommendations for improving the program's portability. ...
10
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3answers
160 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 ...
5
votes
1answer
613 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 ...
5
votes
1answer
134 views

Simulating coin flips and plotting a histogram

I started playing around recently with F# and I find it quite elegant and succinct language. A common problem I like to solve in every language I start to learn is the coin flip problem, with the ...
9
votes
2answers
2k 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: ...
6
votes
2answers
104 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 ...
11
votes
1answer
92 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 ...
3
votes
0answers
59 views

Boilerplate-free mixin pattern for a TypeScript charting library

The TypeScript handbook provides a mixin pattern but it requires a bunch of boilerplate, doesn't work for getters/setters and doesn't support defining default values (or any constructor work) in the ...
2
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0answers
215 views

Generating data for Highcharts

I have written a code to generate chart data for the Highcharts library and need to know if there are any improvements possible. I have applied generics but think it could be fine tuned further. Could ...
22
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3answers
3k views

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: ...
4
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1answer
1k views

D3js: transition from stacked bar chart to bar chart with different datasets

Could I get some advice on the following D3 code that transitions a stacked bar chart into a bar chart with two different datasets? I would like to know how to write cleaner and more efficient code. ...
4
votes
1answer
7k views

Dynamically change data in Chart.js charts with jQuery slider

I created this little JavaScript application which gets data from a post request and uses this data to show a line chart with the total income over a year and a bar chart for the daily income. The ...
3
votes
1answer
736 views

D3 stacked bar chart with linear x axis

In all the examples I've come across so far, (like this, this or this) I see stacked charts in d3 have an ordinal scale. I presume this is because stacked charts are considered an extension of bar ...
3
votes
0answers
442 views

Python, matplotlib, 3d plot, how to make this code effective, light, fast?

I have already make a 3D mesh. See below: And the code below: ...
3
votes
0answers
2k views

Reading a csv file and making a histogram in Python using NumPy and Matplotlib

I have written the following code which reads a csv file that contains a bunch of words and their sentiment value. Words like abandon may have a value of -1, while words like progress and freedom have ...
2
votes
1answer
56 views

Plotting points representing many events on a canvas

I have a web app which uses Node canvas to plot points on a graph. Each point is called an 'event'. An event is an array of usually 6 'parameters' represented as numbers. My app allows users to plot 2 ...
3
votes
1answer
473 views

Histogram output from parse of json-ish data in python

The idea is exploratory data analysis, the output rendered as a histogram to get an idea of relative frequency of records: The example data set looks like this: ...
3
votes
1answer
303 views

Simple D3 code for drawing area charts

I am quite new to D3 and JavaScript in general, so I'm sure there is a way to write the following in a lot less code: ...
1
vote
0answers
25 views

Parsing server request data for visualization in C3.js

The following is a snippet from a script I have that fetches a list of objects representing requests to a server and graphs them using C3.js. I've only included the relevant code that parses the list ...
5
votes
1answer
433 views

Visualize data on interactive map + plot via d3.js

I created an interactive web map with d3. I am fairly new to web programming and am interested what you think about the code. The map is based on unemployment rates for each NUTS-2 region in europe. I ...
1
vote
1answer
152 views

Counting the frequency of certain entries in a list of JSON objects

I have a list of JSON objects that looks like this: [{ url: '/home', ... }, { url: '/analytics', ... }] I'm using the following function to count the ...
3
votes
1answer
185 views

Graphing a linear equation using javascript and html

I'm open to any feedback even if it's just a quick browsing over to get a quick opinion of my code. As part of a job interview process I was given a coding challenge to complete. The challenge was ...
5
votes
2answers
163 views

Read, organize, and plot data from a formatted file

I have a data output file from a LabVIEW program (that I cannot modify), and I need to plot the data and fit to a theoretical curve. I accomplished this with Python (with which I am entirely self-...
5
votes
1answer
729 views

Using chartJS in Angularjs to plot IOT data

I am a Javascript and AngularJS beginner. Below is the code inside my chartController. What this does is get IOT data from a back-end call and display it in my front-end with a chart. There are two ...