The Toolbox provides you also with a set of useful small functions. Here the highlights are angle conversion with rad() and deg(), 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().