Figure 7
From: Kernelized partial least squares for feature reduction and classification of gene microarray data
Exponential RBF kernel. The outputs of the exponential radial basis function kernel as functions of the Euclidean distance between vectors. Four functions are depicted in dashed-double-dotted-blue, long-dashed-red, dashed-green, and dotted-purple curves, corresponding to the cases where the sigma is 0.5, 0.707, 1.0, and 2.0 respectively.