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<h3 class="section">8.251 <code>UNPACK</code> &mdash; Unpack an array of rank one into an array</h3>

<p><a name="index-UNPACK-1099"></a><a name="index-array_002c-unpacking-1100"></a><a name="index-array_002c-increase-dimension-1101"></a><a name="index-array_002c-scatter-elements-1102"></a>
     <dl>
<dt><em>Description</em>:<dd>Store the elements of <var>VECTOR</var> in an array of higher rank.

     <br><dt><em>Standard</em>:<dd>Fortran 95 and later

     <br><dt><em>Class</em>:<dd>Transformational function

     <br><dt><em>Syntax</em>:<dd><code>RESULT = UNPACK(VECTOR, MASK, FIELD)</code>

     <br><dt><em>Arguments</em>:<dd>
     <p><table summary=""><tr align="left"><td valign="top" width="15%"><var>VECTOR</var> </td><td valign="top" width="70%">Shall be an array of any type and rank one. It
shall have at least as many elements as <var>MASK</var> has <code>TRUE</code> values. 
<br></td></tr><tr align="left"><td valign="top" width="15%"><var>MASK</var>   </td><td valign="top" width="70%">Shall be an array of type <code>LOGICAL</code>. 
<br></td></tr><tr align="left"><td valign="top" width="15%"><var>FIELD</var>  </td><td valign="top" width="70%">Shall be of the same type as <var>VECTOR</var> and have
the same shape as <var>MASK</var>.
     <br></td></tr></table>

     <br><dt><em>Return value</em>:<dd>The resulting array corresponds to <var>FIELD</var> with <code>TRUE</code> elements
of <var>MASK</var> replaced by values from <var>VECTOR</var> in array element order.

     <br><dt><em>Example</em>:<dd>
     <pre class="smallexample">          PROGRAM test_unpack
            integer :: vector(2)  = (/1,1/)
            logical :: mask(4)  = (/ .TRUE., .FALSE., .FALSE., .TRUE. /)
            integer :: field(2,2) = 0, unity(2,2)
          
            ! result: unity matrix
            unity = unpack(vector, reshape(mask, (/2,2/)), field)
          END PROGRAM
</pre>
     <br><dt><em>See also</em>:<dd><a href="PACK.html#PACK">PACK</a>, <a href="SPREAD.html#SPREAD">SPREAD</a>
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