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eigensolvers
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fdfd
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waveguides
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<article class="md-content__inner md-typeset">
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<h1 id="meanas">meanas<a class="headerlink" href="#meanas" title="Permanent link">¶</a></h1>
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<p><code>meanas</code> is a Python package for finite-difference electromagnetic simulation.
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It combines:</p>
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<ul>
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<li><code>meanas.fdfd</code> for frequency-domain operators, sources, waveguide modes, and SCPML</li>
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<li><code>meanas.fdtd</code> for Yee-grid timestepping, CPML, energy/flux accounting, and phasor extraction</li>
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<li><code>meanas.fdmath</code> for the shared discrete operators and derivations underneath both solvers</li>
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</ul>
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<p>This documentation is built directly from the package docstrings. The API pages
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are the source of truth for the mathematical derivations and calling
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conventions.</p>
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<h2 id="examples-and-api-map">Examples and API Map<a class="headerlink" href="#examples-and-api-map" title="Permanent link">¶</a></h2>
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<p>For most users, the tracked examples under <code>examples/</code> are the right entry
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point. They show the intended combinations of tools for solving complete
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problems.</p>
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<p>Relevant starting examples:</p>
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<ul>
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<li><code>examples/fdtd.py</code> for broadband pulse excitation and phasor extraction</li>
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<li><code>examples/waveguide.py</code> for guided phasor-domain FDTD/FDFD comparison</li>
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<li><code>examples/waveguide_real.py</code> for real-valued continuous-wave FDTD compared
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against real fields reconstructed from an FDFD solution, including guided-core,
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mode-weighted, and guided-mode / residual comparisons</li>
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<li><code>examples/eme.py</code> for straight-interface mode matching / EME and modal
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scattering between two nearby waveguide cross-sections</li>
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<li><code>examples/eme_bend.py</code> for straight-to-bent mode matching with cylindrical
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bend modes and a cascaded bend-network example</li>
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<li><code>examples/fdfd.py</code> for direct frequency-domain waveguide excitation</li>
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</ul>
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<p>For solver equivalence, prefer the phasor-based examples first. They compare
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the extracted <code>+\omega</code> content of the FDTD run directly against the FDFD
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solution and are the main accuracy benchmarks in the test suite.</p>
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<p><code>examples/waveguide_real.py</code> answers a different, stricter question: how well a
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late raw real snapshot matches <code>Re(E_\omega e^{i\omega t})</code> on a monitor plane.
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That diagnostic is useful, but it also includes orthogonal residual structure
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that the phasor comparison intentionally filters out.</p>
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<p>The API pages are better read as a toolbox map and derivation reference:</p>
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<ul>
|
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<li>Use the <a href="api/fdtd/">FDTD API</a> for time-domain stepping, CPML, phasor
|
|
extraction, and real-field reconstruction from FDFD phasors.</li>
|
|
<li>Use the <a href="api/fdfd/">FDFD API</a> for driven frequency-domain solves and sparse
|
|
operator algebra.</li>
|
|
<li>Use the <a href="api/waveguides/">Waveguide API</a> for mode solving, port sources,
|
|
and overlap windows.</li>
|
|
<li>Use the <a href="api/fdmath/">fdmath API</a> for the lower-level finite-difference
|
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operators and the shared discrete derivations underneath both solvers.</li>
|
|
</ul>
|
|
<h2 id="build-outputs">Build outputs<a class="headerlink" href="#build-outputs" title="Permanent link">¶</a></h2>
|
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<p>The docs build generates two HTML views from the same source:</p>
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<ul>
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<li>a normal multi-page site</li>
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<li>a print-oriented combined page under <code>site/print_page/</code></li>
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</ul>
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<p>If <code>htmlark</code> is installed, <code>./make_docs.sh</code> also writes a fully inlined
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<code>site/standalone.html</code>.</p>
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