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pykinsol provides a Python interface to KINSOL from the SUNDIALS package suite.

Project Description

pykinsol provides a Python binding to the Nonlinear system of equation solver algorithms from kinsol in the SUNDIALS suite. pykinsol allows a user to numerically solve (systems of) non-linear equations. Note that not all functionality of KINSOL are currently exposed in the python wrapper. Additional functinoality is however easy to add if needed.


Autogenerated API documentation is found here.


Simplest way to install pykinsol is to use the conda package manager:

$ conda install -c bjodah pykinsol pytest
$ python -m pytest --pyargs pykinsol

tests should pass.

Binary distribution is available here:

Source distribution is available here:

To compile from source you may proceed e.g. as follows:

$ LLAPACK=openblas python3.4 install --user

where we specified specifically what LAPACK implementation we used for building SUNDIALS.


See examples/, and rendered jupyter notebooks here:

Here is a simple example:

>>> def f(x, fout):
...     fout[0] = x[0] + (x[0] - x[1])**3/2 - 1
...     fout[1] = x[1] + (x[1] - x[0])**3/2
>>> def j(x, Jout, fx):
...     Jout[0, 0] =  1 + 3/2 * (x[0] - x[1])**2
...     Jout[0, 1] =  -3/2 * (x[0] - x[1])**2
...     Jout[1, 0] =  -3/2 * (x[1] - x[0])**2
...     Jout[1, 1] =  1 + 3/2 * (x[1] - x[0])**2
>>> from pykinsol import solve
>>> result = solve(f, j, [0, 0])
>>> assert result['success']
>>> print(result['x'])
[ 0.84116389  0.15883611]


The source code is Open Source and is released under the simplified 2-clause BSD license. See LICENSE for further details.

Contributors are welcome to suggest improvements at


Björn I. Dahlgren, contact:

  • gmail address: bjodah
  • address: bda

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