diff_t fftw_mpi_local_size_many_transposed(int rnk, const ptrdiff_t *n, ptrdiff_t howmany,
                                              ptrdiff_t block0, ptrdiff_t block1, MPI_Comm comm,
                                              ptrdiff_t *local_n0, ptrdiff_t *local_0_start,
                                              ptrdiff_t *local_n1, ptrdiff_t *local_1_start);
</pre></div>

<p>These differ from the basic interface in only two ways.  First, they
allow you to specify block sizes <code>block0</code