Tag Archives: Data

Concatenating and Visualizing Data in Pandas

One of my favorite things about pandas is that you can easily combine temporal data sets using different time scales. Behind the scenes, pandas will fill in the empty gaps with null values, and then quietly ignore those null values when you want to make a scatter plot or do some other computation, like a rolling mean. It takes so much tedious book-keeping out of the data analysis process.

Continue reading Concatenating and Visualizing Data in Pandas

Using THREE.js to Visualize 3D Point Sets

In this post I’ll describe a bare bones application for inputting and displaying three dimensional data in browser. The data is input using HTML, where it is parsed with JavaScript, and then plotted using the THREE.js library. The input data is parsed using whitespace, so colleagues can copy-paste data from Excel into the fields for plotting.

Continue reading Using THREE.js to Visualize 3D Point Sets

Tkinter Optical Character Recognition Training Data Labeler

In this post I’ll demonstrate how to build a object oriented Tkinter GUI application for associating labels to filenames in order to quickly and easily build a set of training data. The Submit button will associate the label with the file, and the Save and Quit button will dump the file and its associated label into a Python dict, and then a cPickle file for later use. This is still a little rough around the edges; it assumes that you’re looking for PNG data in the current directory, and the output overwrites previous output, but it’s a start.

Continue reading Tkinter Optical Character Recognition Training Data Labeler

Small Data: Germinating Seeds

This is the first in a series of posts using the small data sets from The Handbook of Small Data Sets to illustrate introductory techniques in text processing, plotting, statistics, etc. The data sets are collected in a ZIP file at publisher’s website in the link above. Someone decided to format the data files to resemble the published format to the greatest degree possible, which makes parsing the files interesting. First, we will import our modules,

Continue reading Small Data: Germinating Seeds