Skip to main content

Compute and visualize pseudospectra of matrices (like eigtool)

Project description

# PseudoPy [![Build Status](](

PseudoPy computes and visualizes the pseudospectrum of a matrix. It is a Python version of the original [eigtool]( by Thomas G. Wright. The algorithms used in this package can be found in the book [Spectra and pseudospectra]( by [Nick Trefethen]( and [Mark Embree](

## Example
The pseudospectrum of the Grcar matrix looks like this:

![Pseudospectrum of Grcar matrix](grcar.png)

If no knowledge about the location of the pseudospectrum of the given matrix is available, the following lines of code can be used to obtain an approximation:
from pseudopy import NonnormalAuto, demo
from matplotlib import pyplot
from scipy.linalg import eigvals

# get Grcar matrix
A = demo.grcar(32).todense()

# compute pseudospectrum for the levels of interest between [1e-5, 1]
pseudo = NonnormalAuto(A, 1e-5, 1)

# plot
pseudo.plot([10**k for k in range(-4, 0)], spectrum=eigvals(A))

## Installation
```pip install pseudopy```

Note that you may need to add `sudo` if you want to install it system-wide.

## License
PseudoPy is free software licensed under the [MIT License](

Project details

Release history Release notifications

History Node


History Node


History Node


History Node


This version
History Node


History Node


History Node


History Node


History Node


Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Filename, size & hash SHA256 hash help File type Python version Upload date
pseudopy-1.2.0.tar.gz (7.3 kB) Copy SHA256 hash SHA256 Source None Apr 8, 2014

Supported by

Elastic Elastic Search Pingdom Pingdom Monitoring Google Google BigQuery Sentry Sentry Error logging CloudAMQP CloudAMQP RabbitMQ AWS AWS Cloud computing Fastly Fastly CDN DigiCert DigiCert EV certificate StatusPage StatusPage Status page