.. _sec-helper-functions:

Helper Functions
================

The Toolbox provides you also with a set of useful small functions. Here the
highlights are angle conversion with ``rad()`` and ``deg()``, |FFT| calculation
and plotting ``spectrum_from_signal()``, rotation matrix ``rotation_matrix()``,
multi-channel fast convolution ``convolution()``, nearest neighbour search
``findnearestneighbour()``, even or odd checking ``iseven()`` ``isodd()``,
spherical Bessel functions ``sphbesselh()`` ``sphbesselj()`` ``sphbessely()``.

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