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<h4 class="subsection">6.3.1 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:

<pre class="example">     a = {1, [2, 3], 4, 5, 6};
     b = [a{1:4}]
          &rArr; b =
              1   2   3   4
</pre>
   <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><span class="samp">{</span></samp>&rsquo; and &lsquo;<samp><span class="samp">}</span></samp>&rsquo; a new cell array will be created, as the
following example illustrates:

<pre class="example">     a = {1, rand(2, 2), "three"};
     b = { a{ [1, 3] } }
          &rArr; b =
              {
                [1,1] =  1
                [1,2] = three
              }
</pre>
   <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:

<pre class="example">     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>
   <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

<pre class="example">     in{1} = [10, 20, 30, 40, 50, 60, 70, 80, 90];
     in{2} = inf;
     in{3} = "last";
     in{4} = "first";
     out = cell (4, 1);
     [out{1:3}] = find (in{1 : 3});
     [out{4:6}] = find (in{[1, 2, 4]})
          &rArr; out =
             {
               [1,1] = 1
               [2,1] = 9
               [3,1] = 90
               [4,1] = 1
               [3,1] = 1
               [4,1] = 10
             }
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