rface for multidimensional transforms is:
</p>
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<div class="example">
<pre class="example">ptrdiff_t fftw_mpi_local_size_many(int rnk, const ptrdiff_t *n, ptrdiff_t howmany,
                                   ptrdiff_t block0, MPI_Comm comm,
                                   ptrdiff_t *local_n0, ptrdiff_t *local_0_start);
ptr