mexihat
Mexican hat (Ricker) wavelet
Description
[
returns the Mexican hat wavelet psi
,x
] = mexihat(lb
,ub
,n
)psi
evaluated at x
, an
n
-point regular grid in the interval [lb, ub]
. The
Mexican hat wavelet is also known as the Ricker wavelet.
The Mexican hat wavelet has the interval [-5, 5] as effective support. Nearly 100% of the wavelet's energy is in the interval. Although [-5, 5] is the correct theoretical effective support, a wider effective support, [-8, 8], is used in the computation to provide more accurate results.
This function is proportional to the second derivative function of the Gaussian probability density function.
Note
You can use gauswavf
to obtain a second order derivative
of a Gaussian wavelet. If you use the negative of this normalized derivative, the resulting
wavelet resembles the Mexican hat wavelet.
Examples
Input Arguments
Output Arguments
Version History
Introduced before R2006a