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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>Convert an Array into an R vector — convert_array • 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="Convert an Array into an R vector — convert_array"><meta name="description" content="Converts array to the type specified by to. This is a low-level interface;
 most users should use as.data.frame() or as.vector() unless finer-grained
 control is needed over the conversion. This function is an S3 generic
 dispatching on to: developers may implement their own S3 methods for
 custom vector types."><meta property="og:description" content="Converts array to the type specified by to. This is a low-level interface;
 most users should use as.data.frame() or as.vector() unless finer-grained
 control is needed over the conversion. This function is an S3 generic
 dispatching on to: developers may implement their own S3 methods for
 custom vector types."></head><body>
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       <h1>Convert an Array into an R vector</h1>
       <small class="dont-index">Source: <a href="https://github.com/apache/arrow-nanoarrow/blob/main/r/R/convert-array.R" class="external-link"><code>R/convert-array.R</code></a></small>
       <div class="d-none name"><code>convert_array.Rd</code></div>
     </div>

     <div class="ref-description section level2">
     <p>Converts <code>array</code> to the type specified by <code>to</code>. This is a low-level interface;
 most users should use <code><a href="https://rdrr.io/r/base/as.data.frame.html" class="external-link">as.data.frame()</a></code> or <code><a href="https://rdrr.io/r/base/vector.html" class="external-link">as.vector()</a></code> unless finer-grained
 control is needed over the conversion. This function is an S3 generic
 dispatching on <code>to</code>: developers may implement their own S3 methods for
 custom vector types.</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">convert_array</span><span class="op">(</span><span class="va">array</span>, to <span class="op">=</span> <span class="cn">NULL</span>, <span class="va">...</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-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-to">to<a class="anchor" aria-label="anchor" href="#arg-to"></a></dt>
 <dd><p>A target prototype object describing the type to which <code>array</code>
 should be converted, or <code>NULL</code> to use the default conversion as
 returned by <code><a href="infer_nanoarrow_ptype.html">infer_nanoarrow_ptype()</a></code>. Alternatively, a function can be
 passed to perform an alternative calculation of the default ptype as
 a function of <code>array</code> and the default inference of the prototype.</p></dd>


 <dt id="arg--">...<a class="anchor" aria-label="anchor" href="#arg--"></a></dt>
 <dd><p>Passed to S3 methods</p></dd>

 </dl></div>
     <div class="section level2">
     <h2 id="value">Value<a class="anchor" aria-label="anchor" href="#value"></a></h2>
     <p>An R vector of type <code>to</code>.</p>
     </div>
     <div class="section level2">
     <h2 id="details">Details<a class="anchor" aria-label="anchor" href="#details"></a></h2>
     <p>Conversions are implemented for the following R vector types:</p><ul><li><p><code><a href="https://rdrr.io/r/base/logical.html" class="external-link">logical()</a></code>: Any numeric type can be converted to <code><a href="https://rdrr.io/r/base/logical.html" class="external-link">logical()</a></code> in addition
 to the bool type. For numeric types, any non-zero value is considered <code>TRUE</code>.</p></li>
 <li><p><code><a href="https://rdrr.io/r/base/integer.html" class="external-link">integer()</a></code>: Any numeric type can be converted to <code><a href="https://rdrr.io/r/base/integer.html" class="external-link">integer()</a></code>; however,
 a warning will be signaled if the any value is outside the range of the
 32-bit integer.</p></li>
 <li><p><code><a href="https://rdrr.io/r/base/double.html" class="external-link">double()</a></code>: Any numeric type can be converted to <code><a href="https://rdrr.io/r/base/double.html" class="external-link">double()</a></code>. This
 conversion currently does not warn for values that may not roundtrip
 through a floating-point double (e.g., very large uint64 and int64 values).</p></li>
 <li><p><code><a href="https://rdrr.io/r/base/character.html" class="external-link">character()</a></code>: String and large string types can be converted to
 <code><a href="https://rdrr.io/r/base/character.html" class="external-link">character()</a></code>. The conversion does not check for valid UTF-8: if you need
 finer-grained control over encodings, use <code>to = blob::blob()</code>.</p></li>
 <li><p><code><a href="https://rdrr.io/r/base/factor.html" class="external-link">factor()</a></code>: Dictionary-encoded arrays of strings can be converted to
 <code><a href="https://rdrr.io/r/base/factor.html" class="external-link">factor()</a></code>; however, this must be specified explicitly (i.e.,
 <code>convert_array(array, factor())</code>) because arrays arriving
 in chunks can have dictionaries that contain different levels. Use
 <code>convert_array(array, factor(levels = c(...)))</code> to materialize an array
 into a vector with known levels.</p></li>
 <li><p><a href="https://rdrr.io/r/base/as.Date.html" class="external-link">Date</a>: Only the date32 type can be converted to an R Date vector.</p></li>
 <li><p><code><a href="https://hms.tidyverse.org/reference/hms.html" class="external-link">hms::hms()</a></code>: Time32 and time64 types can be converted to <code><a href="https://hms.tidyverse.org/reference/hms.html" class="external-link">hms::hms()</a></code>.</p></li>
 <li><p><code><a href="https://rdrr.io/r/base/difftime.html" class="external-link">difftime()</a></code>: Time32, time64, and duration types can be converted to
 R <code><a href="https://rdrr.io/r/base/difftime.html" class="external-link">difftime()</a></code> vectors. The value is converted to match the <code><a href="https://rdrr.io/r/base/units.html" class="external-link">units()</a></code>
 attribute of <code>to</code>.</p></li>
 <li><p><code><a href="https://blob.tidyverse.org/reference/blob.html" class="external-link">blob::blob()</a></code>: String, large string, binary, and large binary types can
 be converted to <code><a href="https://blob.tidyverse.org/reference/blob.html" class="external-link">blob::blob()</a></code>.</p></li>
 <li><p><code><a href="https://vctrs.r-lib.org/reference/list_of.html" class="external-link">vctrs::list_of()</a></code>: List, large list, and fixed-size list types can be
 converted to <code><a href="https://vctrs.r-lib.org/reference/list_of.html" class="external-link">vctrs::list_of()</a></code>.</p></li>
 <li><p><code><a href="https://rdrr.io/r/base/data.frame.html" class="external-link">data.frame()</a></code>: Struct types can be converted to <code><a href="https://rdrr.io/r/base/data.frame.html" class="external-link">data.frame()</a></code>.</p></li>
 <li><p><code><a href="https://vctrs.r-lib.org/reference/unspecified.html" class="external-link">vctrs::unspecified()</a></code>: Any type can be converted to <code><a href="https://vctrs.r-lib.org/reference/unspecified.html" class="external-link">vctrs::unspecified()</a></code>;
 however, a warning will be raised if any non-null values are encountered.</p></li>
 </ul><p>In addition to the above conversions, a null array may be converted to any
 target prototype except <code><a href="https://rdrr.io/r/base/data.frame.html" class="external-link">data.frame()</a></code>. Extension arrays are currently
 converted as their storage type.</p>
     </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="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="fu"><a href="https://rdrr.io/r/base/data.frame.html" class="external-link">data.frame</a></span><span class="op">(</span>x <span class="op">=</span> <span class="fl">1</span><span class="op">:</span><span class="fl">5</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/utils/str.html" class="external-link">str</a></span><span class="op">(</span><span class="fu">convert_array</span><span class="op">(</span><span class="va">array</span><span class="op">)</span><span class="op">)</span></span></span>
 <span class="r-out co"><span class="r-pr">#&gt;</span> 'data.frame':	5 obs. of  1 variable:</span>
 <span class="r-out co"><span class="r-pr">#&gt;</span>  $ x: int  1 2 3 4 5</span>
 <span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/utils/str.html" class="external-link">str</a></span><span class="op">(</span><span class="fu">convert_array</span><span class="op">(</span><span class="va">array</span>, to <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/data.frame.html" class="external-link">data.frame</a></span><span class="op">(</span>x <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/double.html" class="external-link">double</a></span><span class="op">(</span><span class="op">)</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> 'data.frame':	5 obs. of  1 variable:</span>
 <span class="r-out co"><span class="r-pr">#&gt;</span>  $ x: num  1 2 3 4 5</span>
 <span class="r-in"><span></span></span>
 </code></pre></div>
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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>Convert an Array into an R vector — convert_array • 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="Convert an Array into an R vector — convert_array"><meta name="description" content="Converts array to the type specified by to. This is a low-level interface;
	most users should use as.data.frame() or as.vector() unless finer-grained
	control is needed over the conversion. This function is an S3 generic
	dispatching on to: developers may implement their own S3 methods for
	custom vector types."><meta property="og:description" content="Converts array to the type specified by to. This is a low-level interface;
	most users should use as.data.frame() or as.vector() unless finer-grained
	control is needed over the conversion. This function is an S3 generic
	dispatching on to: developers may implement their own S3 methods for
	custom vector types."></head><body>
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	<main id="main" class="col-md-9"><div class="page-header">

	<h1>Convert an Array into an R vector</h1>
	<small class="dont-index">Source: <a href="https://github.com/apache/arrow-nanoarrow/blob/main/r/R/convert-array.R" class="external-link"><code>R/convert-array.R</code></a></small>
	<div class="d-none name"><code>convert_array.Rd</code></div>
	</div>

	<div class="ref-description section level2">
	<p>Converts <code>array</code> to the type specified by <code>to</code>. This is a low-level interface;
	most users should use <code><a href="https://rdrr.io/r/base/as.data.frame.html" class="external-link">as.data.frame()</a></code> or <code><a href="https://rdrr.io/r/base/vector.html" class="external-link">as.vector()</a></code> unless finer-grained
	control is needed over the conversion. This function is an S3 generic
	dispatching on <code>to</code>: developers may implement their own S3 methods for
	custom vector types.</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">convert_array</span><span class="op">(</span><span class="va">array</span>, to <span class="op">=</span> <span class="cn">NULL</span>, <span class="va">...</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-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-to">to<a class="anchor" aria-label="anchor" href="#arg-to"></a></dt>
	<dd><p>A target prototype object describing the type to which <code>array</code>
	should be converted, or <code>NULL</code> to use the default conversion as
	returned by <code><a href="infer_nanoarrow_ptype.html">infer_nanoarrow_ptype()</a></code>. Alternatively, a function can be
	passed to perform an alternative calculation of the default ptype as
	a function of <code>array</code> and the default inference of the prototype.</p></dd>


	<dt id="arg--">...<a class="anchor" aria-label="anchor" href="#arg--"></a></dt>
	<dd><p>Passed to S3 methods</p></dd>

	</dl></div>
	<div class="section level2">
	<h2 id="value">Value<a class="anchor" aria-label="anchor" href="#value"></a></h2>
	<p>An R vector of type <code>to</code>.</p>
	</div>
	<div class="section level2">
	<h2 id="details">Details<a class="anchor" aria-label="anchor" href="#details"></a></h2>
	<p>Conversions are implemented for the following R vector types:</p><ul><li><p><code><a href="https://rdrr.io/r/base/logical.html" class="external-link">logical()</a></code>: Any numeric type can be converted to <code><a href="https://rdrr.io/r/base/logical.html" class="external-link">logical()</a></code> in addition
	to the bool type. For numeric types, any non-zero value is considered <code>TRUE</code>.</p></li>
	<li><p><code><a href="https://rdrr.io/r/base/integer.html" class="external-link">integer()</a></code>: Any numeric type can be converted to <code><a href="https://rdrr.io/r/base/integer.html" class="external-link">integer()</a></code>; however,
	a warning will be signaled if the any value is outside the range of the
	32-bit integer.</p></li>
	<li><p><code><a href="https://rdrr.io/r/base/double.html" class="external-link">double()</a></code>: Any numeric type can be converted to <code><a href="https://rdrr.io/r/base/double.html" class="external-link">double()</a></code>. This
	conversion currently does not warn for values that may not roundtrip
	through a floating-point double (e.g., very large uint64 and int64 values).</p></li>
	<li><p><code><a href="https://rdrr.io/r/base/character.html" class="external-link">character()</a></code>: String and large string types can be converted to
	<code><a href="https://rdrr.io/r/base/character.html" class="external-link">character()</a></code>. The conversion does not check for valid UTF-8: if you need
	finer-grained control over encodings, use <code>to = blob::blob()</code>.</p></li>
	<li><p><code><a href="https://rdrr.io/r/base/factor.html" class="external-link">factor()</a></code>: Dictionary-encoded arrays of strings can be converted to
	<code><a href="https://rdrr.io/r/base/factor.html" class="external-link">factor()</a></code>; however, this must be specified explicitly (i.e.,
	<code>convert_array(array, factor())</code>) because arrays arriving
	in chunks can have dictionaries that contain different levels. Use
	<code>convert_array(array, factor(levels = c(...)))</code> to materialize an array
	into a vector with known levels.</p></li>
	<li><p><a href="https://rdrr.io/r/base/as.Date.html" class="external-link">Date</a>: Only the date32 type can be converted to an R Date vector.</p></li>
	<li><p><code><a href="https://hms.tidyverse.org/reference/hms.html" class="external-link">hms::hms()</a></code>: Time32 and time64 types can be converted to <code><a href="https://hms.tidyverse.org/reference/hms.html" class="external-link">hms::hms()</a></code>.</p></li>
	<li><p><code><a href="https://rdrr.io/r/base/difftime.html" class="external-link">difftime()</a></code>: Time32, time64, and duration types can be converted to
	R <code><a href="https://rdrr.io/r/base/difftime.html" class="external-link">difftime()</a></code> vectors. The value is converted to match the <code><a href="https://rdrr.io/r/base/units.html" class="external-link">units()</a></code>
	attribute of <code>to</code>.</p></li>
	<li><p><code><a href="https://blob.tidyverse.org/reference/blob.html" class="external-link">blob::blob()</a></code>: String, large string, binary, and large binary types can
	be converted to <code><a href="https://blob.tidyverse.org/reference/blob.html" class="external-link">blob::blob()</a></code>.</p></li>
	<li><p><code><a href="https://vctrs.r-lib.org/reference/list_of.html" class="external-link">vctrs::list_of()</a></code>: List, large list, and fixed-size list types can be
	converted to <code><a href="https://vctrs.r-lib.org/reference/list_of.html" class="external-link">vctrs::list_of()</a></code>.</p></li>
	<li><p><code><a href="https://rdrr.io/r/base/data.frame.html" class="external-link">data.frame()</a></code>: Struct types can be converted to <code><a href="https://rdrr.io/r/base/data.frame.html" class="external-link">data.frame()</a></code>.</p></li>
	<li><p><code><a href="https://vctrs.r-lib.org/reference/unspecified.html" class="external-link">vctrs::unspecified()</a></code>: Any type can be converted to <code><a href="https://vctrs.r-lib.org/reference/unspecified.html" class="external-link">vctrs::unspecified()</a></code>;
	however, a warning will be raised if any non-null values are encountered.</p></li>
	</ul><p>In addition to the above conversions, a null array may be converted to any
	target prototype except <code><a href="https://rdrr.io/r/base/data.frame.html" class="external-link">data.frame()</a></code>. Extension arrays are currently
	converted as their storage type.</p>
	</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="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="fu"><a href="https://rdrr.io/r/base/data.frame.html" class="external-link">data.frame</a></span><span class="op">(</span>x <span class="op">=</span> <span class="fl">1</span><span class="op">:</span><span class="fl">5</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/utils/str.html" class="external-link">str</a></span><span class="op">(</span><span class="fu">convert_array</span><span class="op">(</span><span class="va">array</span><span class="op">)</span><span class="op">)</span></span></span>
	<span class="r-out co"><span class="r-pr">#></span> 'data.frame': 5 obs. of 1 variable:</span>
	<span class="r-out co"><span class="r-pr">#></span> $ x: int 1 2 3 4 5</span>
	<span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/utils/str.html" class="external-link">str</a></span><span class="op">(</span><span class="fu">convert_array</span><span class="op">(</span><span class="va">array</span>, to <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/data.frame.html" class="external-link">data.frame</a></span><span class="op">(</span>x <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/double.html" class="external-link">double</a></span><span class="op">(</span><span class="op">)</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> 'data.frame': 5 obs. of 1 variable:</span>
	<span class="r-out co"><span class="r-pr">#></span> $ x: num 1 2 3 4 5</span>
	<span class="r-in"><span></span></span>
	</code></pre></div>
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