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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/home/sangenya/.cargo/registry/src/github.com-1ecc6299db9ec823/ndarray-0.10.14/src/stacking.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>stacking.rs - source</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../light.css"  id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><script src="../../crates.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../favicon.svg">
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</pre><pre class="rust">
<span class="comment">// Copyright 2014-2016 bluss and ndarray developers.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 &lt;LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license</span>
<span class="comment">// &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>

<span class="kw">use</span> <span class="ident">imp_prelude</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">error</span>::{<span class="ident">ShapeError</span>, <span class="ident">ErrorKind</span>, <span class="ident">from_kind</span>};

<span class="doccomment">/// Stack arrays along the given axis.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ***Errors*** if the arrays have mismatching shapes, apart from along `axis`.</span>
<span class="doccomment">/// (may be made more flexible in the future).&lt;br&gt;</span>
<span class="doccomment">/// ***Errors*** if `arrays` is empty, if `axis` is out of bounds,</span>
<span class="doccomment">/// if the result is larger than is possible to represent.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use ndarray::{arr2, Axis, stack};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = arr2(&amp;[[2., 2.],</span>
<span class="doccomment">///                [3., 3.]]);</span>
<span class="doccomment">/// assert!(</span>
<span class="doccomment">///     stack(Axis(0), &amp;[a.view(), a.view()])</span>
<span class="doccomment">///     == Ok(arr2(&amp;[[2., 2.],</span>
<span class="doccomment">///                  [3., 3.],</span>
<span class="doccomment">///                  [2., 2.],</span>
<span class="doccomment">///                  [3., 3.]]))</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">stack</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">A</span>, <span class="ident">D</span><span class="op">&gt;</span>(<span class="ident">axis</span>: <span class="ident">Axis</span>, <span class="ident">arrays</span>: <span class="kw-2">&amp;</span>[<span class="ident">ArrayView</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span>, <span class="ident">A</span>, <span class="ident">D</span><span class="op">&gt;</span>])
    <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">Array</span><span class="op">&lt;</span><span class="ident">A</span>, <span class="ident">D</span><span class="op">&gt;</span>, <span class="ident">ShapeError</span><span class="op">&gt;</span>
    <span class="kw">where</span> <span class="ident">A</span>: <span class="ident">Copy</span>,
          <span class="ident">D</span>: <span class="ident">RemoveAxis</span>
{
    <span class="kw">if</span> <span class="ident">arrays</span>.<span class="ident">len</span>() <span class="op">=</span><span class="op">=</span> <span class="number">0</span> {
        <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">from_kind</span>(<span class="ident">ErrorKind::Unsupported</span>));
    }
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">res_dim</span> <span class="op">=</span> <span class="ident">arrays</span>[<span class="number">0</span>].<span class="ident">raw_dim</span>();
    <span class="kw">if</span> <span class="ident">axis</span>.<span class="ident">index</span>() <span class="op">&gt;</span><span class="op">=</span> <span class="ident">res_dim</span>.<span class="ident">ndim</span>() {
        <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">from_kind</span>(<span class="ident">ErrorKind::OutOfBounds</span>));
    }
    <span class="kw">let</span> <span class="ident">common_dim</span> <span class="op">=</span> <span class="ident">res_dim</span>.<span class="ident">remove_axis</span>(<span class="ident">axis</span>);
    <span class="kw">if</span> <span class="ident">arrays</span>.<span class="ident">iter</span>().<span class="ident">any</span>(<span class="op">|</span><span class="ident">a</span><span class="op">|</span> <span class="ident">a</span>.<span class="ident">raw_dim</span>().<span class="ident">remove_axis</span>(<span class="ident">axis</span>) <span class="op">!</span><span class="op">=</span> <span class="ident">common_dim</span>) {
        <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">from_kind</span>(<span class="ident">ErrorKind::IncompatibleShape</span>));
    }

    <span class="kw">let</span> <span class="ident">stacked_dim</span> <span class="op">=</span> <span class="ident">arrays</span>.<span class="ident">iter</span>().<span class="ident">fold</span>(<span class="number">0</span>, <span class="op">|</span><span class="ident">acc</span>, <span class="ident">a</span><span class="op">|</span> <span class="ident">acc</span> <span class="op">+</span> <span class="ident">a</span>.<span class="ident">len_of</span>(<span class="ident">axis</span>));
    <span class="ident">res_dim</span>.<span class="ident">set_axis</span>(<span class="ident">axis</span>, <span class="ident">stacked_dim</span>);

    <span class="comment">// we can safely use uninitialized values here because they are Copy</span>
    <span class="comment">// and we will only ever write to them</span>
    <span class="kw">let</span> <span class="ident">size</span> <span class="op">=</span> <span class="ident">res_dim</span>.<span class="ident">size</span>();
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">Vec::with_capacity</span>(<span class="ident">size</span>);
    <span class="kw">unsafe</span> {
        <span class="ident">v</span>.<span class="ident">set_len</span>(<span class="ident">size</span>);
    }
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">res</span> <span class="op">=</span> <span class="macro">try!</span>(<span class="ident">Array::from_shape_vec</span>(<span class="ident">res_dim</span>, <span class="ident">v</span>));

    {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">assign_view</span> <span class="op">=</span> <span class="ident">res</span>.<span class="ident">view_mut</span>();
        <span class="kw">for</span> <span class="ident">array</span> <span class="kw">in</span> <span class="ident">arrays</span> {
            <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">array</span>.<span class="ident">len_of</span>(<span class="ident">axis</span>);
            <span class="kw">let</span> (<span class="kw-2">mut</span> <span class="ident">front</span>, <span class="ident">rest</span>) <span class="op">=</span> <span class="ident">assign_view</span>.<span class="ident">split_at</span>(<span class="ident">axis</span>, <span class="ident">len</span>);
            <span class="ident">front</span>.<span class="ident">assign</span>(<span class="ident">array</span>);
            <span class="ident">assign_view</span> <span class="op">=</span> <span class="ident">rest</span>;
        }
    }
    <span class="prelude-val">Ok</span>(<span class="ident">res</span>)
}

<span class="doccomment">/// Stack arrays along the given axis.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Uses the [`stack`][1] function, calling `ArrayView::from(&amp;a)` on each</span>
<span class="doccomment">/// argument `a`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [1]: fn.stack.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ***Panics*** if the `stack` function would return an error.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #[macro_use(stack)]</span>
<span class="doccomment">/// extern crate ndarray;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// use ndarray::{arr2, Axis};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a = arr2(&amp;[[2., 2.],</span>
<span class="doccomment">///                [3., 3.]]);</span>
<span class="doccomment">/// assert!(</span>
<span class="doccomment">///     stack![Axis(0), a, a]</span>
<span class="doccomment">///     == arr2(&amp;[[2., 2.],</span>
<span class="doccomment">///               [3., 3.],</span>
<span class="doccomment">///               [2., 2.],</span>
<span class="doccomment">///               [3., 3.]])</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="macro">macro_rules!</span> <span class="ident">stack</span> {
    (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">axis</span>:<span class="ident">expr</span>, $( <span class="macro-nonterminal">$</span><span class="macro-nonterminal">array</span>:<span class="ident">expr</span> ),<span class="op">+</span> ) <span class="op">=</span><span class="op">&gt;</span> {
        <span class="macro-nonterminal">$</span><span class="kw">crate</span><span class="macro-nonterminal">::stack</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">axis</span>, <span class="kw-2">&amp;</span>[ $(<span class="macro-nonterminal">$</span><span class="kw">crate</span><span class="macro-nonterminal">::ArrayView::from</span>(<span class="kw-2">&amp;</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">array</span>) ),<span class="op">*</span> ]).<span class="ident">unwrap</span>()
    }
}
</pre></div>
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