Documentation - Matlab API - SPECIAL - vl_ddgaussian

Y=VL_DDGAUSSIAN(X) computes the second derivative of the standard Gaussian density.

To obtain the second derivative of the Gaussian density of standard deviation S, do

  Y = 1/S^3 * VL_DDGAUSSIAN(X/S) .

See also: VL_GAUSSIAN(), VL_DGAUSSIAN(), VL_HELP().