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Installation
============
Install from PyPI using **pip**
-------------------------------
You can use :program:`pip` to install slepc4py_ and its
dependencies.
If you have a working MPI implementation and the ``mpicc`` compiler
wrapper is on your search path, it is highly recommended to install
mpi4py_ first::
$ python -m pip install mpi4py
Ensure you have NumPy_ and petsc4py_ installed::
$ python -m pip install numpy petsc petsc4py
Finally, install slepc4py_::
$ python -m pip install slepc slepc4py
If you already have working PETSc and SLEPc installs, set environment
variables :envvar:`SLEPC_DIR` and :envvar:`PETSC_DIR` (and perhaps
:envvar:`PETSC_ARCH` for non-prefix installs) to appropriate values
and next use :program:`pip`::
$ export SLEPC_DIR=/path/to/slepc
$ export PETSC_DIR=/path/to/petsc
$ export PETSC_ARCH=arch-linux2-c-opt
$ python -m pip install petsc4py slepc4py
Install from the SLEPc source tree
----------------------------------
If you also want to install petsc4py_ from the PETSc source tree, follow
the instructions in the `petsc4py installation`_ page.
Set the :envvar:`PETSC_DIR` and :envvar:`PETSC_ARCH`
environment variables, as well as :envvar:`SLEPC_DIR`.
Follow the instructions to `build SLEPc`_. Then
:file:`cd` to the top of the SLEPc source tree and run::
$ python -m pip install src/binding/slepc4py
The installation of slepc4py_ supports multiple :envvar:`PETSC_ARCH`
in the form of a colon separated list::
$ PETSC_ARCH='arch-0:...:arch-N' python -m pip install src/binding/slepc4py
If you are cross-compiling, and the :mod:`numpy` module cannot be loaded on
your build host, then before invoking :program:`pip`, set the
:envvar:`NUMPY_INCLUDE` environment variable to the path that would be returned
by :samp:`import numpy; numpy.get_include()`::
$ export NUMPY_INCLUDE=/usr/lib/pythonX/site-packages/numpy/core/include
.. _NumPy: https://www.numpy.org
.. _mpi4py: https://mpi4py.readthedocs.io
.. _petsc4py: https://petsc.org/release/petsc4py/reference.html
.. _petsc4py installation: https://petsc.org/release/petsc4py/install.html
.. _slepc4py: https://slepc.upv.es/release/slepc4py/reference.html
.. _build SLEPc: https://slepc.upv.es/release/installation/index.html
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