arrow_head_bezier       make arrowhead from list of bezier control
                        points
arrow_head_catenary     Make catenary arrowhead
arrow_head_ellipse      Make arrrowhead with ellipse
arrow_head_function     Make arrowheads with any function
arrow_head_harpoon      Make a harpoon arrowhead
arrow_head_hypotrochoid
                        Make spirograph arrowheads
arrow_head_icon         Make arrowhead from preset icon
arrow_head_latex        Make latex arrowhead
arrow_head_trefoil      Make trefoil arrowhead
arrow_head_wittgenstein_rod
                        Make arrowhead with Wittengenstein's Rod
nudger                  Nudge columns of a matrix by fixed amounts
plot_arrowhead          Plot arrowhead
reflecter               make a reflection of a matrix on the y axis
rescaler                Rescale each column of a matrix
rev_matrix_rows         reverses the order of rows or columns in a
                        matrix
rotater                 Rotate a 2-column matrix
transformer             Do transformations in a desired order
unitizer                Fit matrix to unit circle
v2matrix                Convert a vector to a matrix
