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Next: <a href="Comma-Separated-Lists-Generated-from-Structure-Arrays.html#Comma-Separated-Lists-Generated-from-Structure-Arrays" accesskey="n" rel="next">Comma Separated Lists Generated from Structure Arrays</a>, Up: <a href="Comma-Separated-Lists.html#Comma-Separated-Lists" accesskey="u" rel="up">Comma Separated Lists</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Comma-Separated-Lists-Generated-from-Cell-Arrays-1"></a>
<h4 class="subsection">6.4.1 Comma Separated Lists Generated from Cell Arrays</h4>

<p>As has been mentioned above (see <a href="Indexing-Cell-Arrays.html#Indexing-Cell-Arrays">Indexing Cell Arrays</a>), elements
of a cell array can be extracted into a comma separated list with the
<code>{</code> and <code>}</code> operators.  By surrounding this list with
<code>[</code> and <code>]</code>, it can be concatenated into an array.  For example:
</p>
<div class="example">
<pre class="example">a = {1, [2, 3], 4, 5, 6};
b = [a{1:4}]
     &rArr; b =
         1   2   3   4   5
</pre></div>

<p>Similarly, it is possible to create a new cell array containing cell
elements selected with <code>{}</code>.  By surrounding the list with
&lsquo;<samp>{</samp>&rsquo; and &lsquo;<samp>}</samp>&rsquo; a new cell array will be created, as the
following example illustrates:
</p>
<div class="example">
<pre class="example">a = {1, rand(2, 2), &quot;three&quot;};
b = { a{ [1, 3] } }
     &rArr; b =
         {
           [1,1] =  1
           [1,2] = three
         }
</pre></div>

<p>Furthermore, cell elements (accessed by <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>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">
<pre class="example">c = {&quot;GNU&quot;, &quot;Octave&quot;, &quot;is&quot;, &quot;Free&quot;, &quot;Software&quot;};
printf (&quot;%s &quot;, c{1}, c{2}, c{3}, c{4}, c{5});
     -| GNU Octave is Free Software
printf (&quot;%s &quot;, c{:});
     -| GNU Octave is Free Software
</pre></div>

<p>If used on the left-hand side of an assignment, a comma separated list
generated with <code>{}</code> can be assigned to.  An example is
</p>
<div class="example">
<pre class="example">in{1} = [10, 20, 30];
in{2} = inf;
in{3} = &quot;last&quot;;
in{4} = &quot;first&quot;;
out = cell (4, 1);
[out{1:3}] = in{1 : 3};
[out{4:6}] = in{[1, 2, 4]})
     &rArr; 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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