- -1.5778e-18 0.000145153 1.32424e-19 0.000143445 -7.6147e-20 6.55677e-5 2.22587e-19 -1.45469e-5 3.01577e-19 -5.3233e-5 3.22253e-20 -5.18305e-5 -8.36085e-22 -3.33247e-5 -1.86065e-19 -1.60719e-5 -4.43286e-19 -6.0251e-6 8.63083e-20 -1.74358e-6 5.65738e-21 -3.62096e-7 4.33784e-20 -3.58901e-8 -1.49965e-19 9.57958e-9 1.3012e-20 6.5884e-9 3.28648e-19 1.80042e-9</code></pre><p>The Dunkl-Xu coefficients are useful for integration. The integral of <span>$f(x,y)$</span> over the disk should be <span>$\pi/2$</span> by harmonicity. The coefficient of <span>$P_{0,0}$</span> multiplied by <code>√π</code> is:</p><pre><code class="language-julia">U[1, 1]*sqrt(π)</code></pre><pre><code class="language-none">1.5707955409153043</code></pre><p>Using an orthonormal basis, the integral of <span>$[f(x,y)]^2$</span> over the disk is approximately the square of the 2-norm of the coefficients:</p><pre><code class="language-julia">norm(U)^2, π/(2*sqrt(2))*log1p(sqrt(2))</code></pre><pre><code class="language-none">(0.978937045726087, 0.9789599179781414)</code></pre><hr/><p><em>This page was generated using <a href="https://github.com/fredrikekre/Literate.jl">Literate.jl</a>.</em></p></article><nav class="docs-footer"><a class="docs-footer-prevpage" href="../chebyshev/">« Chebyshev transform</a><a class="docs-footer-nextpage" href="../halfrange/">Half-range Chebyshev polynomials »</a></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> on <span class="colophon-date" title="Tuesday 26 November 2024 18:45">Tuesday 26 November 2024</span>. Using Julia version 1.11.1.</p></section><footer class="modal-card-foot"></footer></div></div></div></body></html>
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