Real-Data">Multi-Dimensional DFTs of Real Data</a>).  In C, a multidimensional real-to-complex DFT
chops the last dimension roughly in half (N&nbsp;&times;&nbsp;M&nbsp;&times;&nbsp;L
 real input
goes to N&nbsp;&times;&nbsp;M&nbsp;&times;&nbsp;L/2+1
 complex output).  In Fortran, because
the array dimension notation is reversed, the <em>first</em> dimension of
the complex data is chopped roughly in half.  For example consider the
&lsquo;<samp>r2c</samp>&rsquo; transform of L&nbsp;&times;&nbsp;M&nbsp;&times;&