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<div class="main-content" data-page-type="member" id="content" pageids="kmath-core::space.kscience.kmath.expressions/DSCompiler/getPartialDerivativeIndex/#kotlin.IntArray/PointingToDeclaration//244675578">
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<div class="breadcrumbs"><a href="../../index.html">kmath-core</a><span class="delimiter">/</span><a href="../index.html">space.kscience.kmath.expressions</a><span class="delimiter">/</span><a href="index.html">DSCompiler</a><span class="delimiter">/</span><span class="current">getPartialDerivativeIndex</span></div>
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<h1 class="cover"><span>get</span><wbr><span>Partial</span><wbr><span>Derivative</span><wbr><span><span>Index</span></span></h1>
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<div class="platform-hinted " data-platform-hinted="data-platform-hinted"><div class="content sourceset-dependent-content" data-active="" data-togglable=":kmath-core:dokkaHtmlPartial/commonMain"><div class="symbol monospace"><span class="token keyword"></span><span class="token keyword">fun </span><a href="get-partial-derivative-index.html"><span class="token function">getPartialDerivativeIndex</span></a><span class="token punctuation">(</span><span class="parameters "><span class="parameter "><span class="token keyword">vararg </span>orders<span class="token operator">: </span><a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html">Int</a></span></span><span class="token punctuation">)</span><span class="token operator">: </span><a href="https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html">Int</a><span class="clearfix"><span class="floating-right">(<a href="https://github.com/SciProgCentre/kmath/tree/master/kmath-core/src/commonMain/kotlin/space/kscience/kmath/expressions/DSCompiler.kt#L148">source</a>)</span></span></div><p class="paragraph">Get the index of a partial derivative in the array.</p><p class="paragraph">If all orders are set to 0, then the 0<sup>th</sup> order derivative is returned, which is the value of the function.</p><p class="paragraph">The indices of derivatives are between 0 and <a href="size.html">size</a> − 1. Their specific order is fixed for a given compiler, but otherwise not publicly specified. There are however some simple cases which have guaranteed indices:</p><ul><li><p class="paragraph">the index of 0<sup>th</sup> order derivative is always 0</p></li><li><p class="paragraph">if there is only 1 <a href="free-parameters.html">freeParameters</a>, then the derivatives are sorted in increasing derivation order (i.e., f at index 0, df/dp at index 1, d<sup>2</sup>f/dp<sup>2</sup> at index 2 … d<sup>k</sup>f/dp<sup>k</sup> at index k),</p></li><li><p class="paragraph">if the <a href="order.html">order</a> is 1, then the derivatives are sorted in increasing free parameter order (i.e., f at index 0, df/dx<sub>1</sub> at index 1, df/dx<sub>2</sub> at index 2 … df/dx<sub>k</sub> at index k),</p></li><li><p class="paragraph">all other cases are not publicly specified.</p></li></ul><p class="paragraph">This method is the inverse of method <a href="get-partial-derivative-orders.html">getPartialDerivativeOrders</a>.</p><span class="kdoc-tag"><h4 class="">Return</h4><p class="paragraph">index of the partial derivative.</p></span><h4 class="">Parameters</h4><div class="table"><div class="table-row" data-filterable-current=":kmath-core:dokkaHtmlPartial/commonMain" data-filterable-set=":kmath-core:dokkaHtmlPartial/commonMain"><div class="main-subrow keyValue "><div class=""><span class="inline-flex"><div><u><span><span>orders</span></span></u></div></span></div><div><div class="title"><p class="paragraph">derivation orders with respect to each parameter.</p></div></div></div></div></div><h4 class="">See also</h4><div class="table"><div class="table-row" data-filterable-current=":kmath-core:dokkaHtmlPartial/commonMain" data-filterable-set=":kmath-core:dokkaHtmlPartial/commonMain"><div class="main-subrow keyValue "><div class=""><span class="inline-flex"><div><a href="get-partial-derivative-orders.html"><span>DSCompiler.</span><wbr><span>get</span><wbr><span>Partial</span><wbr><span>Derivative</span><wbr><span><span>Orders</span></span></a></div></span></div><div></div></div></div></div></div></div>
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