Figure 5.

Polynomial Kernel. The outputs of the polynomial kernel as functions of the cosine of the angles between vectors. Three functions are depicted in dashed-double-dotted-blue, dashed-single-dotted-red, dotted-green, and dashed-purple curves, corresponding to the cases where the polynomial degree is 1, 2, 3, and 4 respectively.

Land et al. BMC Systems Biology 2011 5(Suppl 3):S13   doi:10.1186/1752-0509-5-S3-S13