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<h4 class="subsection" id="Comma_002dSeparated-Lists-Generated-from-Cell-Arrays-1"><span>6.4.1 Comma-Separated Lists Generated from Cell Arrays<a class="copiable-link" href="#Comma_002dSeparated-Lists-Generated-from-Cell-Arrays-1"> ¶</a></span></h4>
<p>As has been mentioned above (see <a class="pxref" href="Indexing-Cell-Arrays.html">Indexing Cell Arrays</a>), elements
of a cell array can be extracted into a comma-separated list with the
<code class="code">{</code> and <code class="code">}</code> operators. By surrounding this list with
<code class="code">[</code> and <code class="code">]</code>, it can be concatenated into an array. For example:
</p>
<div class="example">
<div class="group"><pre class="example-preformatted">a = {1, [2, 3], 4, 5, 6};
b = [a{1:4}]
⇒ b =
1 2 3 4 5
</pre></div></div>
<p>Similarly, it is possible to create a new cell array containing cell
elements selected with <code class="code">{}</code>. By surrounding the list with
‘<samp class="samp">{</samp>’ and ‘<samp class="samp">}</samp>’ a new cell array will be created, as the
following example illustrates:
</p>
<div class="example">
<div class="group"><pre class="example-preformatted">a = {1, rand(2, 2), "three"};
b = { a{ [1, 3] } }
⇒ b =
{
[1,1] = 1
[1,2] = three
}
</pre></div></div>
<p>Furthermore, cell elements (accessed by <code class="code">{}</code>) can be passed
directly to a function. The list of elements from the cell array will
be passed as an argument list to a given function as if it is called
with the elements as individual arguments. The two calls to
<code class="code">printf</code> in the following example are identical but the latter is
simpler and can handle cell arrays of an arbitrary size:
</p>
<div class="example">
<div class="group"><pre class="example-preformatted">c = {"GNU", "Octave", "is", "Free", "Software"};
printf ("%s ", c{1}, c{2}, c{3}, c{4}, c{5});
-| GNU Octave is Free Software
printf ("%s ", c{:});
-| GNU Octave is Free Software
</pre></div></div>
<p>If used on the left-hand side of an assignment, a comma-separated list
generated with <code class="code">{}</code> can be assigned to. An example is
</p>
<div class="example">
<pre class="example-preformatted">in{1} = [10, 20, 30];
in{2} = inf;
in{3} = "last";
in{4} = "first";
out = cell (4, 1);
[out{1:3}] = in{1 : 3};
[out{4:6}] = in{[1, 2, 4]})
⇒ out =
{
[1,1] =
10 20 30
[2,1] = Inf
[3,1] = last
[4,1] =
10 20 30
[5,1] = Inf
[6,1] = first
}
</pre></div>
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