## Sage: Open Source Mathematics Software System

Sage is a free open-source mathematics software system licensed under the GPL. It builds on top of many existing open-source packages: NumPy, SciPy, matplotlib, Sympy, Maxima, GAP, FLINT, R and many more.  Access their combined power through a common, Python-based language or directly via interfaces or wrappers. → Tour, Tutorial, Documentation Mission: Creating a viable free open source alternative to Magma, Maple, Mathematica and Matlab.   Read more…

## Eigen – C++ library for Matrix Math

Research Links Eigen: Getting Started Eigen: sub Block functions – looks like only the .col() and .row() operations are going to apply to the topological algorithm

## Using GraphViz to Draw Networks

You need a Frames Capable browser to view this content. This GraphViz graph was animated using vis.js Research Links Animated Graph above is from this page vis.js Network examples vis.js  visual interaction system GraphViz Gephi – The Open Graph Viz Platform Wikipedia: Gephi Enumerating Paths in a Circuit Let's draw Read more…

## LTSPICE NetList

I want LTSPICE or otherwise to put out a spice deck like netlist as shown in the photo inset and the video embedded below.   I have not yet found a way to get this type of output.  All the output formats you can select for export in LTSPICE have the form: Read more…

## Economist and Economic Modeller Steve Keen showing instability inherent in high debt economies

Steve Keen talks about instability inherent in high debt economies.  He does this while modeling economies on a computer and demonstrating the oscillations. Video Notes I have seen this kind of stability analysis applied before.  It is valid for circuits and system functions – I would posit it is valid Read more…

## Convolution of time signals using polynomials-The Super Easy Z transform

The filter is the sum of the last 3 signal samples.  The signal is a pulse set of three ones.  The signal arrives 1 sample at a time. Notice the coefficients of the multiplied polynomials are equal to the signal output values at times 0 through 4. If Read more…