y_r2r</code>.
</p>
<p>Instead of <code>rfftwnd_create_plan</code> (or <code>rfftw2d_create_plan</code> or
<code>rfftw3d_create_plan</code>) followed by
<code>rfftwnd_one_real_to_complex</code> or
<code>rfftwnd_one_complex_to_real</code>, you now use <code>fftw_plan_dft_r2c</code>
(or <code>fftw_plan_dft_r2c_2d</code> or <code>fftw_plan_dft_r2c_3d</code>) or
<code>fftw_plan_dft_c2r</code> (or <code>fftw_plan_dft_c2r_2d</code> or
<code>fftw_plan_dft_c2r_3d</code>), respectively, followed by
<code>fftw_execute