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 <!-- Generated by pkgdown: do not edit by hand --><html lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"><title>Modify nanoarrow arrays — nanoarrow_array_init • nanoarrow</title><script src="../deps/jquery-3.6.0/jquery-3.6.0.min.js"></script><meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"><link href="../deps/bootstrap-5.3.1/bootstrap.min.css" rel="stylesheet"><script src="../deps/bootstrap-5.3.1/bootstrap.bundle.min.js"></script><link href="../deps/font-awesome-6.4.2/css/all.min.css" rel="stylesheet"><link href="../deps/font-awesome-6.4.2/css/v4-shims.min.css" rel="stylesheet"><script src="../deps/headroom-0.11.0/headroom.min.js"></script><script src="../deps/headroom-0.11.0/jQuery.headroom.min.js"></script><script src="../deps/bootstrap-toc-1.0.1/bootstrap-toc.min.js"></script><script src="../deps/clipboard.js-2.0.11/clipboard.min.js"></script><script src="../deps/search-1.0.0/autocomplete.jquery.min.js"></script><script src="../deps/search-1.0.0/fuse.min.js"></script><script src="../deps/search-1.0.0/mark.min.js"></script><!-- pkgdown --><script src="../pkgdown.js"></script><meta property="og:title" content="Modify nanoarrow arrays — nanoarrow_array_init"><meta name="description" content="Create a new array or from an existing array, modify one or more parameters.
 When importing an array from elsewhere, nanoarrow_array_set_schema() is
 useful to attach the data type information to the array (without this
 information there is little that nanoarrow can do with the array since its
 content cannot be otherwise interpreted). nanoarrow_array_modify() can
 create a shallow copy and modify various parameters to create a new array,
 including setting children and buffers recursively. These functions power the
 $&amp;lt;- operator, which can modify one parameter at a time."><meta property="og:description" content="Create a new array or from an existing array, modify one or more parameters.
 When importing an array from elsewhere, nanoarrow_array_set_schema() is
 useful to attach the data type information to the array (without this
 information there is little that nanoarrow can do with the array since its
 content cannot be otherwise interpreted). nanoarrow_array_modify() can
 create a shallow copy and modify various parameters to create a new array,
 including setting children and buffers recursively. These functions power the
 $&amp;lt;- operator, which can modify one parameter at a time."></head><body>
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       <h1>Modify nanoarrow arrays</h1>
       <small class="dont-index">Source: <a href="https://github.com/apache/arrow-nanoarrow/blob/main/r/R/array.R" class="external-link"><code>R/array.R</code></a></small>
       <div class="d-none name"><code>nanoarrow_array_init.Rd</code></div>
     </div>

     <div class="ref-description section level2">
     <p>Create a new array or from an existing array, modify one or more parameters.
 When importing an array from elsewhere, <code>nanoarrow_array_set_schema()</code> is
 useful to attach the data type information to the array (without this
 information there is little that nanoarrow can do with the array since its
 content cannot be otherwise interpreted). <code>nanoarrow_array_modify()</code> can
 create a shallow copy and modify various parameters to create a new array,
 including setting children and buffers recursively. These functions power the
 <code>$&lt;-</code> operator, which can modify one parameter at a time.</p>
     </div>

     <div class="section level2">
     <h2 id="ref-usage">Usage<a class="anchor" aria-label="anchor" href="#ref-usage"></a></h2>
     <div class="sourceCode"><pre class="sourceCode r"><code><span><span class="fu">nanoarrow_array_init</span><span class="op">(</span><span class="va">schema</span><span class="op">)</span></span>
 <span></span>
 <span><span class="fu">nanoarrow_array_set_schema</span><span class="op">(</span><span class="va">array</span>, <span class="va">schema</span>, validate <span class="op">=</span> <span class="cn">TRUE</span><span class="op">)</span></span>
 <span></span>
 <span><span class="fu">nanoarrow_array_modify</span><span class="op">(</span><span class="va">array</span>, <span class="va">new_values</span>, validate <span class="op">=</span> <span class="cn">TRUE</span><span class="op">)</span></span></code></pre></div>
     </div>

     <div class="section level2">
     <h2 id="arguments">Arguments<a class="anchor" aria-label="anchor" href="#arguments"></a></h2>


 <dl><dt id="arg-schema">schema<a class="anchor" aria-label="anchor" href="#arg-schema"></a></dt>
 <dd><p>A <a href="as_nanoarrow_schema.html">nanoarrow_schema</a> to attach to this
 <code>array</code>.</p></dd>


 <dt id="arg-array">array<a class="anchor" aria-label="anchor" href="#arg-array"></a></dt>
 <dd><p>A <a href="as_nanoarrow_array.html">nanoarrow_array</a>.</p></dd>


 <dt id="arg-validate">validate<a class="anchor" aria-label="anchor" href="#arg-validate"></a></dt>
 <dd><p>Use <code>FALSE</code> to skip validation. Skipping validation may
 result in creating an array that will crash R.</p></dd>


 <dt id="arg-new-values">new_values<a class="anchor" aria-label="anchor" href="#arg-new-values"></a></dt>
 <dd><p>A named <code><a href="https://rdrr.io/r/base/list.html" class="external-link">list()</a></code> of values to replace.</p></dd>

 </dl></div>
     <div class="section level2">
     <h2 id="value">Value<a class="anchor" aria-label="anchor" href="#value"></a></h2>

 <ul><li><p><code>nanoarrow_array_init()</code> returns a possibly invalid but initialized
 array with a given <code>schema</code>.</p></li>
 <li><p><code>nanoarrow_array_set_schema()</code> returns <code>array</code>, invisibly. Note that
 <code>array</code> is modified in place by reference.</p></li>
 <li><p><code>nanoarrow_array_modify()</code> returns a shallow copy of <code>array</code> with the
 modified parameters such that the original array remains valid.</p></li>
 </ul></div>

     <div class="section level2">
     <h2 id="ref-examples">Examples<a class="anchor" aria-label="anchor" href="#ref-examples"></a></h2>
     <div class="sourceCode"><pre class="sourceCode r"><code><span class="r-in"><span><span class="fu">nanoarrow_array_init</span><span class="op">(</span><span class="fu"><a href="na_type.html">na_string</a></span><span class="op">(</span><span class="op">)</span><span class="op">)</span></span></span>
 <span class="r-out co"><span class="r-pr">#&gt;</span> &lt;nanoarrow_array string[0]&gt;</span>
 <span class="r-out co"><span class="r-pr">#&gt;</span>  $ length    : int 0</span>
 <span class="r-out co"><span class="r-pr">#&gt;</span>  $ null_count: int 0</span>
 <span class="r-out co"><span class="r-pr">#&gt;</span>  $ offset    : int 0</span>
 <span class="r-out co"><span class="r-pr">#&gt;</span>  $ buffers   :List of 3</span>
 <span class="r-out co"><span class="r-pr">#&gt;</span>   ..$ :&lt;nanoarrow_buffer validity&lt;bool&gt;[0][0 b]&gt; ``</span>
 <span class="r-out co"><span class="r-pr">#&gt;</span>   ..$ :&lt;nanoarrow_buffer data_offset&lt;int32&gt;[0][0 b]&gt; ``</span>
 <span class="r-out co"><span class="r-pr">#&gt;</span>   ..$ :&lt;nanoarrow_buffer data&lt;string&gt;[0 b]&gt; ``</span>
 <span class="r-out co"><span class="r-pr">#&gt;</span>  $ dictionary: NULL</span>
 <span class="r-out co"><span class="r-pr">#&gt;</span>  $ children  : list()</span>
 <span class="r-in"><span></span></span>
 <span class="r-in"><span><span class="co"># Modify an array using $ and &lt;-</span></span></span>
 <span class="r-in"><span><span class="va">array</span> <span class="op">&lt;-</span> <span class="fu"><a href="as_nanoarrow_array.html">as_nanoarrow_array</a></span><span class="op">(</span><span class="fl">1</span><span class="op">:</span><span class="fl">5</span><span class="op">)</span></span></span>
 <span class="r-in"><span><span class="va">array</span><span class="op">$</span><span class="va">length</span> <span class="op">&lt;-</span> <span class="fl">4</span></span></span>
 <span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/base/vector.html" class="external-link">as.vector</a></span><span class="op">(</span><span class="va">array</span><span class="op">)</span></span></span>
 <span class="r-out co"><span class="r-pr">#&gt;</span> [1] 1 2 3 4</span>
 <span class="r-in"><span></span></span>
 <span class="r-in"><span><span class="co"># Modify potentially more than one component at a time</span></span></span>
 <span class="r-in"><span><span class="va">array</span> <span class="op">&lt;-</span> <span class="fu"><a href="as_nanoarrow_array.html">as_nanoarrow_array</a></span><span class="op">(</span><span class="fl">1</span><span class="op">:</span><span class="fl">5</span><span class="op">)</span></span></span>
 <span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/base/vector.html" class="external-link">as.vector</a></span><span class="op">(</span><span class="fu">nanoarrow_array_modify</span><span class="op">(</span><span class="va">array</span>, <span class="fu"><a href="https://rdrr.io/r/base/list.html" class="external-link">list</a></span><span class="op">(</span>length <span class="op">=</span> <span class="fl">4</span><span class="op">)</span><span class="op">)</span><span class="op">)</span></span></span>
 <span class="r-out co"><span class="r-pr">#&gt;</span> [1] 1 2 3 4</span>
 <span class="r-in"><span></span></span>
 <span class="r-in"><span><span class="co"># Attach a schema to an array</span></span></span>
 <span class="r-in"><span><span class="va">array</span> <span class="op">&lt;-</span> <span class="fu"><a href="as_nanoarrow_array.html">as_nanoarrow_array</a></span><span class="op">(</span><span class="op">-</span><span class="fl">1L</span><span class="op">)</span></span></span>
 <span class="r-in"><span><span class="fu">nanoarrow_array_set_schema</span><span class="op">(</span><span class="va">array</span>, <span class="fu"><a href="na_type.html">na_uint32</a></span><span class="op">(</span><span class="op">)</span><span class="op">)</span></span></span>
 <span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/base/vector.html" class="external-link">as.vector</a></span><span class="op">(</span><span class="va">array</span><span class="op">)</span></span></span>
 <span class="r-out co"><span class="r-pr">#&gt;</span> [1] 4294967295</span>
 <span class="r-in"><span></span></span>
 </code></pre></div>
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	<!DOCTYPE html>
	<!-- Generated by pkgdown: do not edit by hand --><html lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"><title>Modify nanoarrow arrays — nanoarrow_array_init • nanoarrow</title><script src="../deps/jquery-3.6.0/jquery-3.6.0.min.js"></script><meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"><link href="../deps/bootstrap-5.3.1/bootstrap.min.css" rel="stylesheet"><script src="../deps/bootstrap-5.3.1/bootstrap.bundle.min.js"></script><link href="../deps/font-awesome-6.4.2/css/all.min.css" rel="stylesheet"><link href="../deps/font-awesome-6.4.2/css/v4-shims.min.css" rel="stylesheet"><script src="../deps/headroom-0.11.0/headroom.min.js"></script><script src="../deps/headroom-0.11.0/jQuery.headroom.min.js"></script><script src="../deps/bootstrap-toc-1.0.1/bootstrap-toc.min.js"></script><script src="../deps/clipboard.js-2.0.11/clipboard.min.js"></script><script src="../deps/search-1.0.0/autocomplete.jquery.min.js"></script><script src="../deps/search-1.0.0/fuse.min.js"></script><script src="../deps/search-1.0.0/mark.min.js"></script><!-- pkgdown --><script src="../pkgdown.js"></script><meta property="og:title" content="Modify nanoarrow arrays — nanoarrow_array_init"><meta name="description" content="Create a new array or from an existing array, modify one or more parameters.
	When importing an array from elsewhere, nanoarrow_array_set_schema() is
	useful to attach the data type information to the array (without this
	information there is little that nanoarrow can do with the array since its
	content cannot be otherwise interpreted). nanoarrow_array_modify() can
	create a shallow copy and modify various parameters to create a new array,
	including setting children and buffers recursively. These functions power the
	$&lt;- operator, which can modify one parameter at a time."><meta property="og:description" content="Create a new array or from an existing array, modify one or more parameters.
	When importing an array from elsewhere, nanoarrow_array_set_schema() is
	useful to attach the data type information to the array (without this
	information there is little that nanoarrow can do with the array since its
	content cannot be otherwise interpreted). nanoarrow_array_modify() can
	create a shallow copy and modify various parameters to create a new array,
	including setting children and buffers recursively. These functions power the
	$&lt;- operator, which can modify one parameter at a time."></head><body>
	<a href="#main" class="visually-hidden-focusable">Skip to contents</a>


	<nav class="navbar navbar-expand-lg fixed-top bg-light" data-bs-theme="light" aria-label="Site navigation"><div class="container">

	<a class="navbar-brand me-2" href="../index.html">nanoarrow</a>

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	</div>
	</nav><div class="container template-reference-topic">
	<div class="row">
	<main id="main" class="col-md-9"><div class="page-header">

	<h1>Modify nanoarrow arrays</h1>
	<small class="dont-index">Source: <a href="https://github.com/apache/arrow-nanoarrow/blob/main/r/R/array.R" class="external-link"><code>R/array.R</code></a></small>
	<div class="d-none name"><code>nanoarrow_array_init.Rd</code></div>
	</div>

	<div class="ref-description section level2">
	<p>Create a new array or from an existing array, modify one or more parameters.
	When importing an array from elsewhere, <code>nanoarrow_array_set_schema()</code> is
	useful to attach the data type information to the array (without this
	information there is little that nanoarrow can do with the array since its
	content cannot be otherwise interpreted). <code>nanoarrow_array_modify()</code> can
	create a shallow copy and modify various parameters to create a new array,
	including setting children and buffers recursively. These functions power the
	<code>$<-</code> operator, which can modify one parameter at a time.</p>
	</div>

	<div class="section level2">
	<h2 id="ref-usage">Usage<a class="anchor" aria-label="anchor" href="#ref-usage"></a></h2>
	<div class="sourceCode"><pre class="sourceCode r"><code><span><span class="fu">nanoarrow_array_init</span><span class="op">(</span><span class="va">schema</span><span class="op">)</span></span>
	<span></span>
	<span><span class="fu">nanoarrow_array_set_schema</span><span class="op">(</span><span class="va">array</span>, <span class="va">schema</span>, validate <span class="op">=</span> <span class="cn">TRUE</span><span class="op">)</span></span>
	<span></span>
	<span><span class="fu">nanoarrow_array_modify</span><span class="op">(</span><span class="va">array</span>, <span class="va">new_values</span>, validate <span class="op">=</span> <span class="cn">TRUE</span><span class="op">)</span></span></code></pre></div>
	</div>

	<div class="section level2">
	<h2 id="arguments">Arguments<a class="anchor" aria-label="anchor" href="#arguments"></a></h2>


	<dl><dt id="arg-schema">schema<a class="anchor" aria-label="anchor" href="#arg-schema"></a></dt>
	<dd><p>A <a href="as_nanoarrow_schema.html">nanoarrow_schema</a> to attach to this
	<code>array</code>.</p></dd>


	<dt id="arg-array">array<a class="anchor" aria-label="anchor" href="#arg-array"></a></dt>
	<dd><p>A <a href="as_nanoarrow_array.html">nanoarrow_array</a>.</p></dd>


	<dt id="arg-validate">validate<a class="anchor" aria-label="anchor" href="#arg-validate"></a></dt>
	<dd><p>Use <code>FALSE</code> to skip validation. Skipping validation may
	result in creating an array that will crash R.</p></dd>


	<dt id="arg-new-values">new_values<a class="anchor" aria-label="anchor" href="#arg-new-values"></a></dt>
	<dd><p>A named <code><a href="https://rdrr.io/r/base/list.html" class="external-link">list()</a></code> of values to replace.</p></dd>

	</dl></div>
	<div class="section level2">
	<h2 id="value">Value<a class="anchor" aria-label="anchor" href="#value"></a></h2>

	<ul><li><p><code>nanoarrow_array_init()</code> returns a possibly invalid but initialized
	array with a given <code>schema</code>.</p></li>
	<li><p><code>nanoarrow_array_set_schema()</code> returns <code>array</code>, invisibly. Note that
	<code>array</code> is modified in place by reference.</p></li>
	<li><p><code>nanoarrow_array_modify()</code> returns a shallow copy of <code>array</code> with the
	modified parameters such that the original array remains valid.</p></li>
	</ul></div>

	<div class="section level2">
	<h2 id="ref-examples">Examples<a class="anchor" aria-label="anchor" href="#ref-examples"></a></h2>
	<div class="sourceCode"><pre class="sourceCode r"><code><span class="r-in"><span><span class="fu">nanoarrow_array_init</span><span class="op">(</span><span class="fu"><a href="na_type.html">na_string</a></span><span class="op">(</span><span class="op">)</span><span class="op">)</span></span></span>
	<span class="r-out co"><span class="r-pr">#></span> <nanoarrow_array string[0]></span>
	<span class="r-out co"><span class="r-pr">#></span> $ length : int 0</span>
	<span class="r-out co"><span class="r-pr">#></span> $ null_count: int 0</span>
	<span class="r-out co"><span class="r-pr">#></span> $ offset : int 0</span>
	<span class="r-out co"><span class="r-pr">#></span> $ buffers :List of 3</span>
	<span class="r-out co"><span class="r-pr">#></span> ..$ :<nanoarrow_buffer validity<bool>[0][0 b]> ``</span>
	<span class="r-out co"><span class="r-pr">#></span> ..$ :<nanoarrow_buffer data_offset<int32>[0][0 b]> ``</span>
	<span class="r-out co"><span class="r-pr">#></span> ..$ :<nanoarrow_buffer data<string>[0 b]> ``</span>
	<span class="r-out co"><span class="r-pr">#></span> $ dictionary: NULL</span>
	<span class="r-out co"><span class="r-pr">#></span> $ children : list()</span>
	<span class="r-in"><span></span></span>
	<span class="r-in"><span><span class="co"># Modify an array using $ and <-</span></span></span>
	<span class="r-in"><span><span class="va">array</span> <span class="op"><-</span> <span class="fu"><a href="as_nanoarrow_array.html">as_nanoarrow_array</a></span><span class="op">(</span><span class="fl">1</span><span class="op">:</span><span class="fl">5</span><span class="op">)</span></span></span>
	<span class="r-in"><span><span class="va">array</span><span class="op">$</span><span class="va">length</span> <span class="op"><-</span> <span class="fl">4</span></span></span>
	<span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/base/vector.html" class="external-link">as.vector</a></span><span class="op">(</span><span class="va">array</span><span class="op">)</span></span></span>
	<span class="r-out co"><span class="r-pr">#></span> [1] 1 2 3 4</span>
	<span class="r-in"><span></span></span>
	<span class="r-in"><span><span class="co"># Modify potentially more than one component at a time</span></span></span>
	<span class="r-in"><span><span class="va">array</span> <span class="op"><-</span> <span class="fu"><a href="as_nanoarrow_array.html">as_nanoarrow_array</a></span><span class="op">(</span><span class="fl">1</span><span class="op">:</span><span class="fl">5</span><span class="op">)</span></span></span>
	<span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/base/vector.html" class="external-link">as.vector</a></span><span class="op">(</span><span class="fu">nanoarrow_array_modify</span><span class="op">(</span><span class="va">array</span>, <span class="fu"><a href="https://rdrr.io/r/base/list.html" class="external-link">list</a></span><span class="op">(</span>length <span class="op">=</span> <span class="fl">4</span><span class="op">)</span><span class="op">)</span><span class="op">)</span></span></span>
	<span class="r-out co"><span class="r-pr">#></span> [1] 1 2 3 4</span>
	<span class="r-in"><span></span></span>
	<span class="r-in"><span><span class="co"># Attach a schema to an array</span></span></span>
	<span class="r-in"><span><span class="va">array</span> <span class="op"><-</span> <span class="fu"><a href="as_nanoarrow_array.html">as_nanoarrow_array</a></span><span class="op">(</span><span class="op">-</span><span class="fl">1L</span><span class="op">)</span></span></span>
	<span class="r-in"><span><span class="fu">nanoarrow_array_set_schema</span><span class="op">(</span><span class="va">array</span>, <span class="fu"><a href="na_type.html">na_uint32</a></span><span class="op">(</span><span class="op">)</span><span class="op">)</span></span></span>
	<span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/base/vector.html" class="external-link">as.vector</a></span><span class="op">(</span><span class="va">array</span><span class="op">)</span></span></span>
	<span class="r-out co"><span class="r-pr">#></span> [1] 4294967295</span>
	<span class="r-in"><span></span></span>
	</code></pre></div>
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