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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
<a name="Structure-Arrays"></a>
<div class="header">
<p>
Next: <a href="Creating-Structures.html#Creating-Structures" accesskey="n" rel="next">Creating Structures</a>, Previous: <a href="Basic-Usage-and-Examples.html#Basic-Usage-and-Examples" accesskey="p" rel="prev">Basic Usage and Examples</a>, Up: <a href="Structures.html#Structures" accesskey="u" rel="up">Structures</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>
</div>
<hr>
<a name="Structure-Arrays-1"></a>
<h4 class="subsection">6.1.2 Structure Arrays</h4>

<p>A structure array is a particular instance of a structure, where each of
the fields of the structure is represented by a cell array.  Each of
these cell arrays has the same dimensions.  Conceptually, a structure
array can also be seen as an array of structures with identical
fields.  An example of the creation of a structure array is
</p>
<div class="example">
<pre class="example">x(1).a = &quot;string1&quot;;
x(2).a = &quot;string2&quot;;
x(1).b = 1;
x(2).b = 2;
</pre></div>

<p>which creates a 2-by-1 structure array with two fields.  Another way
to create a structure array is with the <code>struct</code> function
(see <a href="Creating-Structures.html#Creating-Structures">Creating Structures</a>).  As previously, to print the value of
the structure array, you can type its name: 
</p>
<div class="example">
<pre class="example">x
     &rArr; x =
        {
          1x2 struct array containing the fields:

            a
            b
        }  
</pre></div>

<p>Individual elements of the structure array can be returned by indexing
the variable like <code><var>x</var>(1)</code>, which returns a structure with 
two fields:
</p>
<div class="example">
<pre class="example">x(1)
     &rArr; ans =
        {
          a = string1
          b =  1
        }
</pre></div>

<p>Furthermore, the structure array can return a comma separated list of
field values (see <a href="Comma-Separated-Lists.html#Comma-Separated-Lists">Comma Separated Lists</a>), if indexed by one of its
own field names.  For example:
</p>
<div class="example">
<pre class="example">x.a
     &rArr;
        ans = string1
        ans = string2
</pre></div>

<p>Here is another example, using this comma separated list on the
left-hand side of an assignment:
</p>
<div class="example">
<pre class="example">[x.a] = deal (&quot;new string1&quot;, &quot;new string2&quot;);
 x(1).a
     &rArr; ans = new string1
 x(2).a
     &rArr; ans = new string2
</pre></div>

<p>Just as for numerical arrays, it is possible to use vectors as indices
(see <a href="Index-Expressions.html#Index-Expressions">Index Expressions</a>):
</p>
<div class="example">
<pre class="example">x(3:4) = x(1:2);
[x([1,3]).a] = deal (&quot;other string1&quot;, &quot;other string2&quot;);
x.a
     &rArr;
        ans = other string1
        ans = new string2
        ans = other string2
        ans = new string2
</pre></div>

<p>The function <code>size</code> will return the size of the structure.  For
the example above
</p>
<div class="example">
<pre class="example">size (x)
     &rArr; ans =

          1   4
</pre></div>

<p>Elements can be deleted from a structure array in a similar manner to a
numerical array, by assigning the elements to an empty matrix.  For
example
</p>
<div class="example">
<pre class="example">in = struct (&quot;call1&quot;, {x, Inf, &quot;last&quot;}, 
             &quot;call2&quot;, {x, Inf, &quot;first&quot;})
     &rArr; in =
        {
          1x3 struct array containing the fields:

            call1
            call2
        }

in(1) = [];
in.call1
     &rArr;
       ans = Inf
       ans = last
</pre></div>

<hr>
<div class="header">
<p>
Next: <a href="Creating-Structures.html#Creating-Structures" accesskey="n" rel="next">Creating Structures</a>, Previous: <a href="Basic-Usage-and-Examples.html#Basic-Usage-and-Examples" accesskey="p" rel="prev">Basic Usage and Examples</a>, Up: <a href="Structures.html#Structures" accesskey="u" rel="up">Structures</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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