Figure 4.

Dot product kernel. The outputs of dot product kernel as functions of the angles between vectors. Four functions are depicted in solid-blue, long-dashed-red, short-dashed-green and dotted-purple curves, corresponding to the cases where the product of the norms of the <a onClick="popup('http://www.biomedcentral.com/1752-0509/5/S3/S13/mathml/M20','MathML',630,470);return false;" target="_blank" href="http://www.biomedcentral.com/1752-0509/5/S3/S13/mathml/M20">View MathML</a> and <a onClick="popup('http://www.biomedcentral.com/1752-0509/5/S3/S13/mathml/M21','MathML',630,470);return false;" target="_blank" href="http://www.biomedcentral.com/1752-0509/5/S3/S13/mathml/M21">View MathML</a> vectors is equal to 0.5, 1, 2 and 3 respectively.

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