95 lines
6.1 KiB
HTML
95 lines
6.1 KiB
HTML
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<!DOCTYPE html>
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<title>CLiki: physical-quantities</title>
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<link rel="alternate" type="application/atom+xml" title="ATOM feed of edits to current article"
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href="https://www.cliki.net/site/feed/article.atom?title=physical-quantities">
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</head>
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<body>
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<span class="hidden">CLiki - physical-quantities</span>
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<div id="content"><div id="content-area"><div id="article-title">physical-quantities</div><div id="article">A library for processing physical quantities: values, <a href="units.html" class="category">units</a>, (and uncertainty).<p><h3>Features:</h3>
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<ul>
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<li>Each quantity has a value, an (optional) unit, and an (optional) uncertainty.
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</li>
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<li>Calculations are done using special functions like q+ or qsqrt.
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</li>
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<li>Units and uncertainty are affected by calculations:
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<ul>
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<li>Unit combination
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</li>
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<li>Error propagation
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</li>
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</ul>
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</li>
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<li>Units can be converted.
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</li>
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<li>Convenient read-macro to define quantities: #q(1 kg).
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</li>
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<li>Value, unit, and uncertainty can be accessed, if needed.
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</li>
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<li>
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<a href="https://en.wikipedia.org/wiki/International_System_of_Units">SI units</a> are predefined.
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</li>
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<li>Any other units can be defined.
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</li>
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</ul><p><h3>Usage:</h3>
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<div class="code"><span class="nonparen"><span class="paren1">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/fun_providecm_require.html" class="symbol">require</a> <span class="keyword">:asdf</span></span>)</span>
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<span class="paren1">(<span class="nonparen">asdf:load-system <span class="keyword">:physical-quantities</span></span>)</span>
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<span class="paren1">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/fun_use-package.html" class="symbol">use-package</a> <span class="keyword">:physical-quantities}</span>
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<span class="paren2">(<span class="nonparen"><i><span class="symbol">define-si-units</span></i></span>)</span>
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<span class="paren2">(<span class="nonparen"><i><span class="symbol">define-read-macros</span></i></span>)</span>
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<span class="paren2">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/speope_letcm_letst.html" class="symbol"><i><span class="symbol">let</span></i></a> <span class="paren3">(<span class="nonparen">m c E</span>)</span>
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<span class="comment">;; Define the mass
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</span> <span class="paren3">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/any_setf.html" class="symbol">setf</a> m #q<span class="paren4">(<span class="nonparen">1.00 +/- 0.01 kg</span>)</span></span>)</span>
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<span class="comment">;; The speed of light
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</span> <span class="paren3">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/any_setf.html" class="symbol">setf</a> c #q<span class="paren4">(<span class="nonparen">299792458 m / s</span>)</span></span>)</span>
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<span class="comment">;; E = m * c^2
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</span> <span class="paren3">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/any_setf.html" class="symbol">setf</a> E <span class="paren4">(<span class="nonparen">q* m <span class="paren5">(<span class="nonparen">qpow c 2</span>)</span></span>)</span></span>)</span>
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<span class="comment">;; Print E, converted to petajoule
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</span> <span class="paren3">(<span class="nonparen"><a href="https://www.cliki.net/site/HyperSpec/Body/fun_writecm_p_rintcm_princ.html" class="symbol">print</a> #q<span class="paren4">(<span class="nonparen">E -> PJ</span>)</span></span>)</span></span>)</span>
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</span></span></span></div><p><h3>Homepage:</h3>
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<a href="https://github.com/mrossini-ethz/physical-quantities">https://github.com/mrossini-ethz/physical-quantities</a><p><h3>Installation:</h3>
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physical-quantities can be installed through <a href="Quicklisp.html" class="internal">Quicklisp</a>.<p><h3>License:</h3>
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<a href="GPL.html" class="category">GPL</a></div></div>
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<div id="footer" class="buttonbar"><ul><li><a href="physical-quantities.html">Current version</a></li>
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<li><a href="https://www.cliki.net/site/history?article=physical-quantities">History</a></li>
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<li><a href="https://www.cliki.net/site/backlinks?article=physical-quantities">Backlinks</a></li><li><a href="https://www.cliki.net/site/edit-article?title=physical-quantities&from-revision=3781451518">Edit</a></li><li><a href="https://www.cliki.net/site/edit-article?create=t">Create</a></li></ul></div>
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