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A parallel kernel-independent FMM library for particle and volume potentials

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# PVFMM [![Build Status](https://github.com/dmalhotra/pvfmm/actions/workflows/build.yml/badge.svg)](https://github.com/dmalhotra/pvfmm/actions/workflows/build.yml) [![Documentation Status](https://readthedocs.org/projects/pvfmm/badge/?version=latest)](https://pvfmm.readthedocs.io/en/latest/) [![Stable Version](https://badgen.net/github/tag/dmalhotra/pvfmm)](https://github.com/dmalhotra/pvfmm/tags) [![Latest Release](https://img.shields.io/github/v/release/dmalhotra/pvfmm?color=%233D9970)](https://github.com/dmalhotra/pvfmm/releases)

### What is PVFMM?

PVFMM is a library for solving certain types of elliptic partial
   differential equations. 
    
   * We support Stokes, Poisson, and Helmholtz problems on the unit
     cube, with free-space or periodic boundary conditions. Our method is
     based on
     volume potential integral equation formulation accelerated by the
     Kernel Independent Fast Multipole Method.

### Documentation

Full documentation — installation, tutorials for the C++, C,
   Fortran, Python, and Julia interfaces, and the API reference — is
   hosted at [pvfmm.readthedocs.io](https://pvfmm.readthedocs.io).

### How to get PVFMM

For the latest stable release of PVFMM visit [pvfmm.org](http://pvfmm.org)

### License

PVFMM is distributed under the LGPLv3 licence. See COPYING in
   the top-level directory of the distribution.

### Installing PVFMM

To install PVFMM, follow the steps in the INSTALL file, which is
   located in the top directory of the source distribution.

### Using PVFMM

The file examples/Makefile can be used as a template makefile for any
   project using the library. In general the MakeVariables file should
   be included in any makefile and CXXFLAGS_PVFMM and LDLIBS_PVFMM should
   be used to compile the code.

Two very simple examples illustrating usage of the library are available:
      For particle N-body  : examples/src/example1.cpp
      For volume potentials: examples/src/example2.cpp

To compile these examples:
      make examples/bin/example1
      make examples/bin/example2

* The volume potentials example will take a long time, the first time
     it is used, since it has to precompute quadrature rules. This data
     is saved to a file and used for subsequent runs. See INSTALL for
     the configure option '--with-precomp-dir=DIR' to set the default
     path for precomputed data.

### Language bindings

Python bindings are available under `python/`.
   Julia bindings are available under `julia/` (see `julia/README.md`).

### Acknowledgment

This software has been developed as part of the work supported by,
   * US National Institutes of Health/10042242
   * US Department of Energy/DE-SC0010518
   * US Department of Energy/DE-SC0009286
   * US National Science Foundation/CCF-1337393
   * US Air Force Office for Scientific Research /FA9550-12-10484

The authors would also like to thank ORNL/OLCF and TACC for providing
   access to computing resources for the development, testing and
   benchmarking of this software.

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