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vlt.neuro.reverse_correlation.hartley.hartley_image

  HARTLEY_IMAGE - A Hartley image function

   IM = vlt.neuro.reverse_correlation.hartley.hartley_image(S, KX, KY, M)

   Returns the Hartley image defined by the equation

   H(kx,ky) = s * vlt.math.cas(2*pi*(kx*l+ky*m)/M)
    where l and m run from 0 to M-1.

   S can be -1 or 1.

   From Ringach et al., 1997