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<h3 class="section">4.5 Guru Interface</h3>
<p><a name="index-guru-interface-230"></a>
The “guru” interface to FFTW is intended to expose as much as possible
of the flexibility in the underlying FFTW architecture. It allows one
to compute multi-dimensional “vectors” (loops) of multi-dimensional
transforms, where each vector/transform dimension has an independent
size and stride.
<a name="index-vector-231"></a>One can also use more general complex-number formats, e.g. separate real
and imaginary arrays.
<p>In addition to the more flexible planner interface, there are also
guru generalizations of <code>fftw_execute</code> that allow a given plan to
be executed on a different array (sufficiently similar to the
original). Note that in order to use the guru execute functions, you
do not need to use the guru planner interface: you can create plans
with the basic or advanced interface and execute them with the guru
interface.
<p>For those users who require the flexibility of the guru interface, it is
important that they pay special attention to the documentation lest they
shoot themselves in the foot.
<ul class="menu">
<li><a accesskey="1" href="Interleaved-and-split-arrays.html#Interleaved-and-split-arrays">Interleaved and split arrays</a>
<li><a accesskey="2" href="Guru-vector-and-transform-sizes.html#Guru-vector-and-transform-sizes">Guru vector and transform sizes</a>
<li><a accesskey="3" href="Guru-Complex-DFTs.html#Guru-Complex-DFTs">Guru Complex DFTs</a>
<li><a accesskey="4" href="Guru-Real_002ddata-DFTs.html#Guru-Real_002ddata-DFTs">Guru Real-data DFTs</a>
<li><a accesskey="5" href="Guru-Real_002dto_002dreal-Transforms.html#Guru-Real_002dto_002dreal-Transforms">Guru Real-to-real Transforms</a>
<li><a accesskey="6" href="Guru-Execution-of-Plans.html#Guru-Execution-of-Plans">Guru Execution of Plans</a>
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