e>n1</code> array in row-major
order, but for an <code>FFTW_MPI_TRANSPOSED_IN</code> plan the input data is
stored as <code>n1</code> by <code>local_n0</code> in row-major order.  Similarly,
<code>FFTW_MPI_TRANSPOSED_OUT</code> means that the output is <code>n0</code> by
<code>local_n1</code> instead of <code>local_n1</code> by <code>n0</code>. 
<a name="index-FFTW_005fMPI_005fTRANSPOSED_005fOUT-402"></a><a name="index-FFTW_005fMPI_005fTRANSPOSED_005fIN-403"></a>

   <p>To determine the local size of the ar