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Ruler and compass construction of a pentagon

A dynamic visualization made with d3.js

A Pen by Riccardo Scalco on CodePen.

License.

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Confidence intervals on linear regression

Python code for the evaluation of linear regression and confidence intervals between two random variables x and y.

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Twitter users visibility by means of regular Markov chains.

This is an attempt to define user visibility on a specific topic. Briefly, tweets are collected via the Twitter streaming API, stored in sqlite databases and then processed in order to create a regular Markov chain. The steady state distribution of the chain defines a metric on the set of Twitter users, which can be used to retrieve an ordered list of users.

Have a look at this paper and this other paper for further details about the mathematical methods.

Be careful, the procedure described here is experimental and it is not meant to be used in production environments.

Fetching and storing from the Twitter streaming

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SVG Circle Pulse

A Pen by Riccardo Scalco on CodePen.

License.

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Topojson of Italy

Shapefile source: http://www.istat.it/it/archivio/24613

Convert shapefile to geojson, s_srs defines the input projection, t_srs defines the output projection to the EPSG code 4326 (http://spatialreference.org/ref/epsg/4326/) see also http://www.gdal.org/ogr2ogr.html

ogr2ogr -f GeoJSON -s_srs prov2011_g.prj -t_srs EPSG:4326 sub.json prov2011_g.shp

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#!/bin/bash

# Install ghostscript.
# Assume A and B have the same amount of files.
# Assume file in A are named `testo_1`, and files in B are named `disegno_1`.

END=`ls A/*.pdf | wc -l`

echo "merging..."

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Add fonts to directory ~/.fonts.

See available fonts:

$ fc-list | col | sort | less

For example, among all I have:

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Resources

• jspm Getting Started guide in the documentation
• Getting Started With jspm & SystemJS

---

Set node version

$ nvm install 5.7.0

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$ git checkout 0d1d7fc32 .
$ git commit -m "revert to older commit"
$ git push origin master