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<html lang="en"><head><meta charset="UTF-8"/><meta name="viewport" content="width=device-width, initial-scale=1.0"/><title>LibHYPRE C API · HYPRE.jl</title><script data-outdated-warner src="../assets/warner.js"></script><link rel="canonical" href="https://fredrikekre.github.io/HYPRE.jl/stable/libhypre/"/><link href="https://cdnjs.cloudflare.com/ajax/libs/lato-font/3.0.0/css/lato-font.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/juliamono/0.045/juliamono.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/css/fontawesome.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/css/solid.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/css/brands.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.13.24/katex.min.css" rel="stylesheet" type="text/css"/><script>documenterBaseURL=".."</script><script src="https://cdnjs.cloudflare.com/ajax/libs/require.js/2.3.6/require.min.js" data-main="../assets/documenter.js"></script><script src="../siteinfo.js"></script><script src="../../versions.js"></script><link class="docs-theme-link" rel="stylesheet" type="text/css" href="../assets/themes/documenter-dark.css" data-theme-name="documenter-dark" data-theme-primary-dark/><link class="docs-theme-link" rel="stylesheet" type="text/css" href="../assets/themes/documenter-light.css" data-theme-name="documenter-light" data-theme-primary/><script src="../assets/themeswap.js"></script></head><body><div id="documenter"><nav class="docs-sidebar"><div class="docs-package-name"><span class="docs-autofit"><a href="../">HYPRE.jl</a></span></div><form class="docs-search" action="../search/"><input class="docs-search-query" id="documenter-search-query" name="q" type="text" placeholder="Search docs"/></form><ul class="docs-menu"><li><a class="tocitem" href="../">Home</a></li><li><a class="tocitem" href="../hypre-matrix-vector/">Matrix/vector representation</a></li><li class="is-active"><a class="tocitem" href>LibHYPRE C API</a></li></ul><div class="docs-version-selector field has-addons"><div class="control"><span class="docs-label button is-static is-size-7">Version</span></div><div class="docs-selector control is-expanded"><div class="select is-fullwidth is-size-7"><select id="documenter-version-selector"></select></div></div></div></nav><div class="docs-main"><header class="docs-navbar"><nav class="breadcrumb"><ul class="is-hidden-mobile"><li class="is-active"><a href>LibHYPRE C API</a></li></ul><ul class="is-hidden-tablet"><li class="is-active"><a href>LibHYPRE C API</a></li></ul></nav><div class="docs-right"><a class="docs-navbar-link" href="https://github.com/fredrikekre/HYPRE.jl" title="View the repository on GitHub"><span class="docs-icon fab"></span><span class="docs-label is-hidden-touch">GitHub</span></a><a class="docs-navbar-link" href="https://github.com/fredrikekre/HYPRE.jl/blob/master/docs/src/libhypre.md" title="Edit source on GitHub"><span class="docs-icon fas"></span></a><a class="docs-settings-button docs-navbar-link fas fa-cog" id="documenter-settings-button" href="#" title="Settings"></a><a class="docs-sidebar-button docs-navbar-link fa fa-bars is-hidden-desktop" id="documenter-sidebar-button" href="#"></a></div></header><article class="content" id="documenter-page"><h1 id="LibHYPRE-C-API"><a class="docs-heading-anchor" href="#LibHYPRE-C-API">LibHYPRE C API</a><a id="LibHYPRE-C-API-1"></a><a class="docs-heading-anchor-permalink" href="#LibHYPRE-C-API" title="Permalink"></a></h1><p>The submodule <code>HYPRE.LibHYPRE</code> contains auto-generated bindings to the HYPRE library and give access to the HYPRE C API directly<sup class="footnote-reference"><a id="citeref-1" href="#footnote-1">[1]</a></sup>. The module exports all <code>HYPRE_*</code> symbols. Function names and arguments are identical to the C-library – refer to the <a href="https://hypre.readthedocs.io/">HYPRE manual</a> for details.</p><p>The example program <a href="https://github.com/fredrikekre/HYPRE.jl/blob/master/examples/ex5.jl"><code>examples/ex5.jl</code></a> is an (almost) line-to-line translation of the corresponding example program <a href="https://github.com/hypre-space/hypre/blob/ac9d7d0d7b43cd3d0c7f24ec5d64b58fbf900097/src/examples/ex5.c"><code>examples/ex5.c</code></a> written in C, and showcases how HYPRE.jl can be used to interact with the HYPRE library directly.</p><p>Functions from the <code>LibHYPRE</code> submodule can be used together with the high level interface. This is useful when you need some functionality from the library which isn't exposed in the high level interface. Many functions require passing a reference to a matrix/vector or a solver. These can be obtained as follows:</p><table><tr><th style="text-align: left">C type signature</th><th style="text-align: left">Argument to pass</th></tr><tr><td style="text-align: left"><code>HYPRE_IJMatrix</code></td><td style="text-align: left"><code>A.ijmatrix</code> where <code>A::HYPREMatrix</code></td></tr><tr><td style="text-align: left"><code>HYPRE_ParCSRMatrix</code></td><td style="text-align: left"><code>A.parmatrix</code> where <code>A::HYPREMatrix</code></td></tr><tr><td style="text-align: left"><code>HYPRE_IJVector</code></td><td style="text-align: left"><code>b.ijvector</code> where <code>b::HYPREVector</code></td></tr><tr><td style="text-align: left"><code>HYPRE_ParVector</code></td><td style="text-align: left"><code>b.parvector</code> where <code>b::HYPREVector</code></td></tr><tr><td style="text-align: left"><code>HYPRE_Solver</code></td><td style="text-align: left"><code>s.solver</code> where <code>s::HYPRESolver</code></td></tr></table><section class="footnotes is-size-7"><ul><li class="footnote" id="footnote-1"><a class="tag is-link" href="#citeref-1">1</a>Bindings are generated using <a href="https://github.com/JuliaInterop/Clang.jl">Clang.jl</a>, see <a href="https://github.com/fredrikekre/HYPRE.jl/blob/master/gen/generator.jl">gen/generator.jl</a>.</li></ul></section></article><nav class="docs-footer"><a class="docs-footer-prevpage" href="../hypre-matrix-vector/">« Matrix/vector representation</a><div class="flexbox-break"></div><p class="footer-message">Powered by <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> and the <a href="https://julialang.org/">Julia Programming Language</a>.</p></nav></div><div class="modal" id="documenter-settings"><div class="modal-background"></div><div class="modal-card"><header class="modal-card-head"><p class="modal-card-title">Settings</p><button class="delete"></button></header><section class="modal-card-body"><p><label class="label">Theme</label><div class="select"><select id="documenter-themepicker"><option value="documenter-light">documenter-light</option><option value="documenter-dark">documenter-dark</option></select></div></p><hr/><p>This document was generated with <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> version 0.28.0-DEV on <span class="colophon-date" title="Thursday 28 July 2022 00:11">Thursday 28 July 2022</span>. 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