<p>A three-dimensional surface plot of the <i>unnormalized</i> <a href="https://en.wikipedia.org/wiki/sinc_function" class="extiw" title="en:sinc function"><b>sinc</b> function</a> — precisely,
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<span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\begin{aligned}&amp;-10\leq x\leq 10\\&amp;-10\leq y\leq 10\\&amp;z=\operatorname {sinc} \left({\sqrt {x^{2}+y^{2}}}\right)\\\end{aligned}}}"><semantics><mrow class="MJX-TeXAtom-ORD"><mstyle displaystyle="true" scriptlevel="0"><mrow class="MJX-TeXAtom-ORD"><mtable columnalign="right left right left right left right left right left right left" rowspacing="3pt" columnspacing="0em 2em 0em 2em 0em 2em 0em 2em 0em 2em 0em" displaystyle="true"><mtr><mtd></mtd><mtd><mi></mi><mo>−<!-- − --></mo><mn>10</mn><mo>≤<!-- ≤ --></mo><mi>x</mi><mo>≤<!-- ≤ --></mo><mn>10</mn></mtd></mtr><mtr><mtd></mtd><mtd><mi></mi><mo>−<!-- − --></mo><mn>10</mn><mo>≤<!-- ≤ --></mo><mi>y</mi><mo>≤<!-- ≤ --></mo><mn>10</mn></mtd></mtr><mtr><mtd></mtd><mtd><mi>z</mi><mo>=</mo><mi>sinc</mi><mo>⁡<!-- ⁡ --></mo><mrow><mo>(</mo><mrow class="MJX-TeXAtom-ORD"><msqrt><msup><mi>x</mi><mrow class="MJX-TeXAtom-ORD"><mn>2</mn></mrow></msup><mo>+</mo><msup><mi>y</mi><mrow class="MJX-TeXAtom-ORD"><mn>2</mn></mrow></msup></msqrt></mrow><mo>)</mo></mrow></mtd></mtr></mtable></mrow></mstyle></mrow><annotation encoding="application/x-tex">{\displaystyle {\begin{aligned}&amp;-10\leq x\leq 10\\&amp;-10\leq y\leq 10\\&amp;z=\operatorname {sinc} \left({\sqrt {x^{2}+y^{2}}}\right)\\\end{aligned}}}</annotation></semantics></math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/4ff1f2131047bac1e21aa7875c989d2a619784d0" class="mwe-math-fallback-image-inline" aria-hidden="true" style="vertical-align: -5.505ex; width:22.01ex; height:12.176ex;" alt="{\displaystyle {\begin{aligned}&amp;-10\leq x\leq 10\\&amp;-10\leq y\leq 10\\&amp;z=\operatorname {sinc} \left({\sqrt {x^{2}+y^{2}}}\right)\\\end{aligned}}}"></span>
<a href="//commons.wikimedia.org/wiki/User:DmitTrix" title="User:DmitTrix">DmitTrix</a>
2008-05-24
<span class="int-own-work" lang="en">Own work</span>